Get MIME type from filename extension

Question

How can I get the MIME type from a file extension

User · Answer

You could use the table provided from Apache's httpd. It should be trivial to map this into a function, dictionary, list, etc.

Also, as seen here, extension->mime type is not necessarily a function. There may be multiple common MIME types per file extension, so you should look at the requirements of your application, and see why you care about MIME types, what you want "to do" with them, etc. Can you use file extensions to key the same behavior? Do you need to read the first few bytes of a file to determine its MIME type as well?

User · Answer

Use MediaTypeNames Class-- sample   MediaTypeNames Application Pdf

User · Answer

My take at those mimetypes  using the apache list  the below script will give you a dictionary with all the mimetypes   var mimeTypeListUrl    http   svn apache org repos asf httpd httpd trunk docs conf mime types   var webClient   new WebClient    var rawData   webClient DownloadString mimeTypeListUrl  Split new     Environment NewLine    n     StringSplitOptions RemoveEmptyEntries    var extensionToMimeType   new Dictionary lt string  string gt     var mimeTypeToExtension   new Dictionary lt string  string   gt      foreach  var row in rawData        if  row StartsWith       continue       var rowData   row Split new       t     StringSplitOptions RemoveEmptyEntries       if  rowData Length    2  continue       var extensions   rowData 1  Split new            StringSplitOptions RemoveEmptyEntries       if   mimeTypeToExtension ContainsKey rowData 0                  mimeTypeToExtension Add rowData 0   extensions              foreach  var extension in extensions                if   extensionToMimeType ContainsKey extension                         extensionToMimeType Add extension  rowData 0

User · Answer

This helper class returns mime type  content type   description and icons for any file name   using Microsoft Win32  using System  using System Drawing  using System IO  using System Runtime InteropServices   public static class Helper        DllImport  shell32 dll   CharSet   CharSet Auto       private static extern int ExtractIconEx string lpszFile  int nIconIndex  IntPtr   phIconLarge  IntPtr   phIconSmall  int nIcons         DllImport  user32 dll   SetLastError   true       private static extern int DestroyIcon IntPtr hIcon        public static string GetFileContentType string fileName                if  fileName    null                        throw new ArgumentNullException  fileName                       RegistryKey registryKey   null          try                       FileInfo fileInfo   new FileInfo fileName                if  string IsNullOrEmpty fileInfo Extension                                 return string Empty                             string extension   fileInfo Extension ToLowerInvariant                 registryKey   Registry ClassesRoot OpenSubKey extension               if  registryKey    null                                return string Empty                             object contentTypeObject   registryKey GetValue  Content Type                if    contentTypeObject is string                                 return string Empty                             string contentType    string contentTypeObject               return contentType                    catch  Exception                        return null                    finally                       if  registryKey    null                                registryKey Close                                       public static string GetFileDescription string fileName                if  fileName    null                        throw new ArgumentNullException  fileName                       RegistryKey registryKey1   null          RegistryKey registryKey2   null          try                       FileInfo fileInfo   new FileInfo fileName                if  string IsNullOrEmpty fileInfo Extension                                 return string Empty                             string extension   fileInfo Extension ToLowerInvariant                 registryKey1   Registry ClassesRoot OpenSubKey extension               if  registryKey1    null                                return string Empty                             object extensionDefaultObject   registryKey1 GetValue null               if    extensionDefaultObject is string                                 return string Empty                             string extensionDefaultValue    string extensionDefaultObject               registryKey2   Registry ClassesRoot OpenSubKey extensionDefaultValue               if  registryKey2    null                                return string Empty                             object fileDescriptionObject   registryKey2 GetValue null               if    fileDescriptionObject is string                                 return string Empty                             string fileDescription    string fileDescriptionObject              return fileDescription                    catch  Exception                        return null                    finally                       if  registryKey2    null                                registryKey2 Close                               if  registryKey1    null                                registryKey1 Close                                       public static void GetFileIcons string fileName  out Icon smallIcon  out Icon largeIcon                if  fileName    null                        throw new ArgumentNullException  fileName                       smallIcon   null          largeIcon   null           RegistryKey registryKey1   null          RegistryKey registryKey2   null          try                       FileInfo fileInfo   new FileInfo fileName                if  string IsNullOrEmpty fileInfo Extension                                 return                             string extension   fileInfo Extension ToLowerInvariant                 registryKey1   Registry ClassesRoot OpenSubKey extension               if  registryKey1    null                                return                             object extensionDefaultObject   registryKey1 GetValue null               if    extensionDefaultObject is string                                 return                             string defaultIconKeyName   string Format   0   DefaultIcon   extensionDefaultObject                registryKey2   Registry ClassesRoot OpenSubKey defaultIconKeyName               if  registryKey2    null                                return                             object defaultIconPathObject   registryKey2 GetValue null               if    defaultIconPathObject is string                                 return                             string defaultIconPath    string defaultIconPathObject              if  string IsNullOrWhiteSpace defaultIconPath                                 return                             string iconfileName   null              int iconIndex   0               int commaIndex   defaultIconPath IndexOf                   if  commaIndex  gt  0                                iconfileName   defaultIconPath Substring 0  commaIndex                   string iconIndexString   defaultIconPath Substring commaIndex   1                    if   int TryParse iconIndexString  out iconIndex                                         iconIndex   0                                              else                               iconfileName   defaultIconPath                  iconIndex   0                             IntPtr   phiconSmall   new IntPtr 1    IntPtr Zero                IntPtr   phiconLarge   new IntPtr 1    IntPtr Zero                 int readIconCount   ExtractIconEx iconfileName  iconIndex  phiconLarge  phiconSmall  1                if  readIconCount  lt  0                                return                             if  phiconSmall 0     IntPtr Zero                                smallIcon    Icon Icon FromHandle phiconSmall 0   Clone                    DestroyIcon phiconSmall 0                               if  phiconLarge 0     IntPtr Zero                                largeIcon    Icon Icon FromHandle phiconLarge 0   Clone                    DestroyIcon phiconLarge 0                               return                    finally                       if  registryKey2    null                                registryKey2 Close                               if  registryKey1    null                                registryKey1 Close                                        Usage   string fileName    NotExists txt   string contentType   Helper GetFileContentType fileName       text plain  string description   Helper GetFileDescription fileName       Text Document  Icon smallIcon  largeIcon  Helper GetFileIcons fileName  out smallIcon  out largeIcon      16x16  32x32 icons

User · Answer

To make the post more comprehensive  for  NET Core devs there is FileExtensionContentTypeProvider class  which covers the official MIME content types    It works behind the scene - sets ContentType in the Http Response headers based on the filename extension   In case you need special MIME types  see example on customising the MIME types   public void Configure IApplicationBuilder app           Set up custom content types -associating file extension to MIME type     var provider   new FileExtensionContentTypeProvider           Add new mappings     provider Mappings   myapp      application x-msdownload       provider Mappings   htm3      text html       provider Mappings   image      image png          Replace an existing mapping     provider Mappings   rtf      application x-msdownload          Remove MP4 videos      provider Mappings Remove   mp4         app UseStaticFiles new StaticFileOptions                 FileProvider   new PhysicalFileProvider              Path Combine Directory GetCurrentDirectory      wwwroot    images             RequestPath   new PathString   MyImages            ContentTypeProvider   provider              app UseDirectoryBrowser new DirectoryBrowserOptions                 FileProvider   new PhysicalFileProvider              Path Combine Directory GetCurrentDirectory      wwwroot    images             RequestPath   new PathString   MyImages

User · Answer

You can use MimeMappings class  I think this is the easiest way  I give import of MimeMappings too  because I felt lots of trouble to find import of those classes  import org springframework boot web server MimeMappings      MimeMappings mm new MimeMappings    String mimetype   mm get fileExtension   System out println mimetype

User · Answer

I like the work that Samuel Neff did  but not the idea and overhead of creating a dictionary every time   I restructured things as a switch case   Yes you can t iterate over it but in my case I only ever use it to quickly look up a value   Especially because it is done in a web service  the last thing I want is a bunch of overhead as the application prepares its structures   The compiler will turn this into a hashed lookup and so it will be very fast   public static string GetMimeType string extension      if  extension    null      throw new ArgumentNullException  extension       if  extension StartsWith           extension   extension Substring 1       switch  extension ToLower           region Big freaking list of mime types     case  323   return  text h323       case  3g2   return  video 3gpp2       case  3gp   return  video 3gpp       case  3gp2   return  video 3gpp2       case  3gpp   return  video 3gpp       case  7z   return  application x-7z-compressed       case  aa   return  audio audible       case  aac   return  audio aac       case  aaf   return  application octet-stream       case  aax   return  audio vnd audible aax       case  ac3   return  audio ac3       case  aca   return  application octet-stream       case  accda   return  application msaccess addin       case  accdb   return  application msaccess       case  accdc   return  application msaccess cab       case  accde   return  application msaccess       case  accdr   return  application msaccess runtime       case  accdt   return  application msaccess       case  accdw   return  application msaccess webapplication       case  accft   return  application msaccess ftemplate       case  acx   return  application internet-property-stream       case  addin   return  text xml       case  ade   return  application msaccess       case  adobebridge   return  application x-bridge-url       case  adp   return  application msaccess       case  adt   return  audio vnd dlna adts       case  adts   return  audio aac       case  afm   return  application octet-stream       case  ai   return  application postscript       case  aif   return  audio x-aiff       case  aifc   return  audio aiff       case  aiff   return  audio aiff       case  air   return  application vnd adobe air-application-installer-package zip       case  amc   return  application x-mpeg       case  application   return  application x-ms-application       case  art   return  image x-jg       case  asa   return  application xml       case  asax   return  application xml       case  ascx   return  application xml       case  asd   return  application octet-stream       case  asf   return  video x-ms-asf       case  ashx   return  application xml       case  asi   return  application octet-stream       case  asm   return  text plain       case  asmx   return  application xml       case  aspx   return  application xml       case  asr   return  video x-ms-asf       case  asx   return  video x-ms-asf       case  atom   return  application atom xml       case  au   return  audio basic       case  avi   return  video x-msvideo       case  axs   return  application olescript       case  bas   return  text plain       case  bcpio   return  application x-bcpio       case  bin   return  application octet-stream       case  bmp   return  image bmp       case  c   return  text plain       case  cab   return  application octet-stream       case  caf   return  audio x-caf       case  calx   return  application vnd ms-office calx       case  cat   return  application vnd ms-pki seccat       case  cc   return  text plain       case  cd   return  text plain       case  cdda   return  audio aiff       case  cdf   return  application x-cdf       case  cer   return  application x-x509-ca-cert       case  chm   return  application octet-stream       case  class   return  application x-java-applet       case  clp   return  application x-msclip       case  cmx   return  image x-cmx       case  cnf   return  text plain       case  cod   return  image cis-cod       case  config   return  application xml       case  contact   return  text x-ms-contact       case  coverage   return  application xml       case  cpio   return  application x-cpio       case  cpp   return  text plain       case  crd   return  application x-mscardfile       case  crl   return  application pkix-crl       case  crt   return  application x-x509-ca-cert       case  cs   return  text plain       case  csdproj   return  text plain       case  csh   return  application x-csh       case  csproj   return  text plain       case  css   return  text css       case  csv   return  text csv       case  cur   return  application octet-stream       case  cxx   return  text plain       case  dat   return  application octet-stream       case  datasource   return  application xml       case  dbproj   return  text plain       case  dcr   return  application x-director       case  def   return  text plain       case  deploy   return  application octet-stream       case  der   return  application x-x509-ca-cert       case  dgml   return  application xml       case  dib   return  image bmp       case  dif   return  video x-dv       case  dir   return  application x-director       case  disco   return  text xml       case  dll   return  application x-msdownload       case  dll config   return  text xml       case  dlm   return  text dlm       case  doc   return  application msword       case  docm   return  application vnd ms-word document macroenabled 12       case  docx   return  application vnd openxmlformats-officedocument wordprocessingml document       case  dot   return  application msword       case  dotm   return  application vnd ms-word template macroenabled 12       case  dotx   return  application vnd openxmlformats-officedocument wordprocessingml template       case  dsp   return  application octet-stream       case  dsw   return  text plain       case  dtd   return  text xml       case  dtsconfig   return  text xml       case  dv   return  video x-dv       case  dvi   return  application x-dvi       case  dwf   return  drawing x-dwf       case  dwp   return  application octet-stream       case  dxr   return  application x-director       case  eml   return  message rfc822       case  emz   return  application octet-stream       case  eot   return  application octet-stream       case  eps   return  application postscript       case  etl   return  application etl       case  etx   return  text x-setext       case  evy   return  application envoy       case  exe   return  application octet-stream       case  exe config   return  text xml       case  fdf   return  application vnd fdf       case  fif   return  application fractals       case  filters   return  application xml       case  fla   return  application octet-stream       case  flr   return  x-world x-vrml       case  flv   return  video x-flv       case  fsscript   return  application fsharp-script       case  fsx   return  application fsharp-script       case  generictest   return  application xml       case  gif   return  image gif       case  group   return  text x-ms-group       case  gsm   return  audio x-gsm       case  gtar   return  application x-gtar       case  gz   return  application x-gzip       case  h   return  text plain       case  hdf   return  application x-hdf       case  hdml   return  text x-hdml       case  hhc   return  application x-oleobject       case  hhk   return  application octet-stream       case  hhp   return  application octet-stream       case  hlp   return  application winhlp       case  hpp   return  text plain       case  hqx   return  application mac-binhex40       case  hta   return  application hta       case  htc   return  text x-component       case  htm   return  text html       case  html   return  text html       case  htt   return  text webviewhtml       case  hxa   return  application xml       case  hxc   return  application xml       case  hxd   return  application octet-stream       case  hxe   return  application xml       case  hxf   return  application xml       case  hxh   return  application octet-stream       case  hxi   return  application octet-stream       case  hxk   return  application xml       case  hxq   return  application octet-stream       case  hxr   return  application octet-stream       case  hxs   return  application octet-stream       case  hxt   return  text html       case  hxv   return  application xml       case  hxw   return  application octet-stream       case  hxx   return  text plain       case  i   return  text plain       case  ico   return  image x-icon       case  ics   return  application octet-stream       case  idl   return  text plain       case  ief   return  image ief       case  iii   return  application x-iphone       case  inc   return  text plain       case  inf   return  application octet-stream       case  inl   return  text plain       case  ins   return  application x-internet-signup       case  ipa   return  application x-itunes-ipa       case  ipg   return  application x-itunes-ipg       case  ipproj   return  text plain       case  ipsw   return  application x-itunes-ipsw       case  iqy   return  text x-ms-iqy       case  isp   return  application x-internet-signup       case  ite   return  application x-itunes-ite       case  itlp   return  application x-itunes-itlp       case  itms   return  application x-itunes-itms       case  itpc   return  application x-itunes-itpc       case  ivf   return  video x-ivf       case  jar   return  application java-archive       case  java   return  application octet-stream       case  jck   return  application liquidmotion       case  jcz   return  application liquidmotion       case  jfif   return  image pjpeg       case  jnlp   return  application x-java-jnlp-file       case  jpb   return  application octet-stream       case  jpe   return  image jpeg       case  jpeg   return  image jpeg       case  jpg   return  image jpeg       case  js   return  application x-javascript       case  jsx   return  text jscript       case  jsxbin   return  text plain       case  latex   return  application x-latex       case  library-ms   return  application windows-library xml       case  lit   return  application x-ms-reader       case  loadtest   return  application xml       case  lpk   return  application octet-stream       case  lsf   return  video x-la-asf       case  lst   return  text plain       case  lsx   return  video x-la-asf       case  lzh   return  application octet-stream       case  m13   return  application x-msmediaview       case  m14   return  application x-msmediaview       case  m1v   return  video mpeg       case  m2t   return  video vnd dlna mpeg-tts       case  m2ts   return  video vnd dlna mpeg-tts       case  m2v   return  video mpeg       case  m3u   return  audio x-mpegurl       case  m3u8   return  audio x-mpegurl       case  m4a   return  audio m4a       case  m4b   return  audio m4b       case  m4p   return  audio m4p       case  m4r   return  audio x-m4r       case  m4v   return  video x-m4v       case  mac   return  image x-macpaint       case  mak   return  text plain       case  man   return  application x-troff-man       case  manifest   return  application x-ms-manifest       case  map   return  text plain       case  master   return  application xml       case  mda   return  application msaccess       case  mdb   return  application x-msaccess       case  mde   return  application msaccess       case  mdp   return  application octet-stream       case  me   return  application x-troff-me       case  mfp   return  application x-shockwave-flash       case  mht   return  message rfc822       case  mhtml   return  message rfc822       case  mid   return  audio mid       case  midi   return  audio mid       case  mix   return  application octet-stream       case  mk   return  text plain       case  mmf   return  application x-smaf       case  mno   return  text xml       case  mny   return  application x-msmoney       case  mod   return  video mpeg       case  mov   return  video quicktime       case  movie   return  video x-sgi-movie       case  mp2   return  video mpeg       case  mp2v   return  video mpeg       case  mp3   return  audio mpeg       case  mp4   return  video mp4       case  mp4v   return  video mp4       case  mpa   return  video mpeg       case  mpe   return  video mpeg       case  mpeg   return  video mpeg       case  mpf   return  application vnd ms-mediapackage       case  mpg   return  video mpeg       case  mpp   return  application vnd ms-project       case  mpv2   return  video mpeg       case  mqv   return  video quicktime       case  ms   return  application x-troff-ms       case  msi   return  application octet-stream       case  mso   return  application octet-stream       case  mts   return  video vnd dlna mpeg-tts       case  mtx   return  application xml       case  mvb   return  application x-msmediaview       case  mvc   return  application x-miva-compiled       case  mxp   return  application x-mmxp       case  nc   return  application x-netcdf       case  nsc   return  video x-ms-asf       case  nws   return  message rfc822       case  ocx   return  application octet-stream       case  oda   return  application oda       case  odc   return  text x-ms-odc       case  odh   return  text plain       case  odl   return  text plain       case  odp   return  application vnd oasis opendocument presentation       case  ods   return  application oleobject       case  odt   return  application vnd oasis opendocument text       case  one   return  application onenote       case  onea   return  application onenote       case  onepkg   return  application onenote       case  onetmp   return  application onenote       case  onetoc   return  application onenote       case  onetoc2   return  application onenote       case  orderedtest   return  application xml       case  osdx   return  application opensearchdescription xml       case  p10   return  application pkcs10       case  p12   return  application x-pkcs12       case  p7b   return  application x-pkcs7-certificates       case  p7c   return  application pkcs7-mime       case  p7m   return  application pkcs7-mime       case  p7r   return  application x-pkcs7-certreqresp       case  p7s   return  application pkcs7-signature       case  pbm   return  image x-portable-bitmap       case  pcast   return  application x-podcast       case  pct   return  image pict       case  pcx   return  application octet-stream       case  pcz   return  application octet-stream       case  pdf   return  application pdf       case  pfb   return  application octet-stream       case  pfm   return  application octet-stream       case  pfx   return  application x-pkcs12       case  pgm   return  image x-portable-graymap       case  pic   return  image pict       case  pict   return  image pict       case  pkgdef   return  text plain       case  pkgundef   return  text plain       case  pko   return  application vnd ms-pki pko       case  pls   return  audio scpls       case  pma   return  application x-perfmon       case  pmc   return  application x-perfmon       case  pml   return  application x-perfmon       case  pmr   return  application x-perfmon       case  pmw   return  application x-perfmon       case  png   return  image png       case  pnm   return  image x-portable-anymap       case  pnt   return  image x-macpaint       case  pntg   return  image x-macpaint       case  pnz   return  image png       case  pot   return  application vnd ms-powerpoint       case  potm   return  application vnd ms-powerpoint template macroenabled 12       case  potx   return  application vnd openxmlformats-officedocument presentationml template       case  ppa   return  application vnd ms-powerpoint       case  ppam   return  application vnd ms-powerpoint addin macroenabled 12       case  ppm   return  image x-portable-pixmap       case  pps   return  application vnd ms-powerpoint       case  ppsm   return  application vnd ms-powerpoint slideshow macroenabled 12       case  ppsx   return  application vnd openxmlformats-officedocument presentationml slideshow       case  ppt   return  application vnd ms-powerpoint       case  pptm   return  application vnd ms-powerpoint presentation macroenabled 12       case  pptx   return  application vnd openxmlformats-officedocument presentationml presentation       case  prf   return  application pics-rules       case  prm   return  application octet-stream       case  prx   return  application octet-stream       case  ps   return  application postscript       case  psc1   return  application powershell       case  psd   return  application octet-stream       case  psess   return  application xml       case  psm   return  application octet-stream       case  psp   return  application octet-stream       case  pub   return  application x-mspublisher       case  pwz   return  application vnd ms-powerpoint       case  qht   return  text x-html-insertion       case  qhtm   return  text x-html-insertion       case  qt   return  video quicktime       case  qti   return  image x-quicktime       case  qtif   return  image x-quicktime       case  qtl   return  application x-quicktimeplayer       case  qxd   return  application octet-stream       case  ra   return  audio x-pn-realaudio       case  ram   return  audio x-pn-realaudio       case  rar   return  application octet-stream       case  ras   return  image x-cmu-raster       case  rat   return  application rat-file       case  rc   return  text plain       case  rc2   return  text plain       case  rct   return  text plain       case  rdlc   return  application xml       case  resx   return  application xml       case  rf   return  image vnd rn-realflash       case  rgb   return  image x-rgb       case  rgs   return  text plain       case  rm   return  application vnd rn-realmedia       case  rmi   return  audio mid       case  rmp   return  application vnd rn-rn music package       case  roff   return  application x-troff       case  rpm   return  audio x-pn-realaudio-plugin       case  rqy   return  text x-ms-rqy       case  rtf   return  application rtf       case  rtx   return  text richtext       case  ruleset   return  application xml       case  s   return  text plain       case  safariextz   return  application x-safari-safariextz       case  scd   return  application x-msschedule       case  sct   return  text scriptlet       case  sd2   return  audio x-sd2       case  sdp   return  application sdp       case  sea   return  application octet-stream       case  searchconnector-ms   return  application windows-search-connector xml       case  setpay   return  application set-payment-initiation       case  setreg   return  application set-registration-initiation       case  settings   return  application xml       case  sgimb   return  application x-sgimb       case  sgml   return  text sgml       case  sh   return  application x-sh       case  shar   return  application x-shar       case  shtml   return  text html       case  sit   return  application x-stuffit       case  sitemap   return  application xml       case  skin   return  application xml       case  sldm   return  application vnd ms-powerpoint slide macroenabled 12       case  sldx   return  application vnd openxmlformats-officedocument presentationml slide       case  slk   return  application vnd ms-excel       case  sln   return  text plain       case  slupkg-ms   return  application x-ms-license       case  smd   return  audio x-smd       case  smi   return  application octet-stream       case  smx   return  audio x-smd       case  smz   return  audio x-smd       case  snd   return  audio basic       case  snippet   return  application xml       case  snp   return  application octet-stream       case  sol   return  text plain       case  sor   return  text plain       case  spc   return  application x-pkcs7-certificates       case  spl   return  application futuresplash       case  src   return  application x-wais-source       case  srf   return  text plain       case  ssisdeploymentmanifest   return  text xml       case  ssm   return  application streamingmedia       case  sst   return  application vnd ms-pki certstore       case  stl   return  application vnd ms-pki stl       case  sv4cpio   return  application x-sv4cpio       case  sv4crc   return  application x-sv4crc       case  svc   return  application xml       case  swf   return  application x-shockwave-flash       case  t   return  application x-troff       case  tar   return  application x-tar       case  tcl   return  application x-tcl       case  testrunconfig   return  application xml       case  testsettings   return  application xml       case  tex   return  application x-tex       case  texi   return  application x-texinfo       case  texinfo   return  application x-texinfo       case  tgz   return  application x-compressed       case  thmx   return  application vnd ms-officetheme       case  thn   return  application octet-stream       case  tif   return  image tiff       case  tiff   return  image tiff       case  tlh   return  text plain       case  tli   return  text plain       case  toc   return  application octet-stream       case  tr   return  application x-troff       case  trm   return  application x-msterminal       case  trx   return  application xml       case  ts   return  video vnd dlna mpeg-tts       case  tsv   return  text tab-separated-values       case  ttf   return  application octet-stream       case  tts   return  video vnd dlna mpeg-tts       case  txt   return  text plain       case  u32   return  application octet-stream       case  uls   return  text iuls       case  user   return  text plain       case  ustar   return  application x-ustar       case  vb   return  text plain       case  vbdproj   return  text plain       case  vbk   return  video mpeg       case  vbproj   return  text plain       case  vbs   return  text vbscript       case  vcf   return  text x-vcard       case  vcproj   return  application xml       case  vcs   return  text plain       case  vcxproj   return  application xml       case  vddproj   return  text plain       case  vdp   return  text plain       case  vdproj   return  text plain       case  vdx   return  application vnd ms-visio viewer       case  vml   return  text xml       case  vscontent   return  application xml       case  vsct   return  text xml       case  vsd   return  application vnd visio       case  vsi   return  application ms-vsi       case  vsix   return  application vsix       case  vsixlangpack   return  text xml       case  vsixmanifest   return  text xml       case  vsmdi   return  application xml       case  vspscc   return  text plain       case  vss   return  application vnd visio       case  vsscc   return  text plain       case  vssettings   return  text xml       case  vssscc   return  text plain       case  vst   return  application vnd visio       case  vstemplate   return  text xml       case  vsto   return  application x-ms-vsto       case  vsw   return  application vnd visio       case  vsx   return  application vnd visio       case  vtx   return  application vnd visio       case  wav   return  audio wav       case  wave   return  audio wav       case  wax   return  audio x-ms-wax       case  wbk   return  application msword       case  wbmp   return  image vnd wap wbmp       case  wcm   return  application vnd ms-works       case  wdb   return  application vnd ms-works       case  wdp   return  image vnd ms-photo       case  webarchive   return  application x-safari-webarchive       case  webtest   return  application xml       case  wiq   return  application xml       case  wiz   return  application msword       case  wks   return  application vnd ms-works       case  wlmp   return  application wlmoviemaker       case  wlpginstall   return  application x-wlpg-detect       case  wlpginstall3   return  application x-wlpg3-detect       case  wm   return  video x-ms-wm       case  wma   return  audio x-ms-wma       case  wmd   return  application x-ms-wmd       case  wmf   return  application x-msmetafile       case  wml   return  text vnd wap wml       case  wmlc   return  application vnd wap wmlc       case  wmls   return  text vnd wap wmlscript       case  wmlsc   return  application vnd wap wmlscriptc       case  wmp   return  video x-ms-wmp       case  wmv   return  video x-ms-wmv       case  wmx   return  video x-ms-wmx       case  wmz   return  application x-ms-wmz       case  wpl   return  application vnd ms-wpl       case  wps   return  application vnd ms-works       case  wri   return  application x-mswrite       case  wrl   return  x-world x-vrml       case  wrz   return  x-world x-vrml       case  wsc   return  text scriptlet       case  wsdl   return  text xml       case  wvx   return  video x-ms-wvx       case  x   return  application directx       case  xaf   return  x-world x-vrml       case  xaml   return  application xaml xml       case  xap   return  application x-silverlight-app       case  xbap   return  application x-ms-xbap       case  xbm   return  image x-xbitmap       case  xdr   return  text plain       case  xht   return  application xhtml xml       case  xhtml   return  application xhtml xml       case  xla   return  application vnd ms-excel       case  xlam   return  application vnd ms-excel addin macroenabled 12       case  xlc   return  application vnd ms-excel       case  xld   return  application vnd ms-excel       case  xlk   return  application vnd ms-excel       case  xll   return  application vnd ms-excel       case  xlm   return  application vnd ms-excel       case  xls   return  application vnd ms-excel       case  xlsb   return  application vnd ms-excel sheet binary macroenabled 12       case  xlsm   return  application vnd ms-excel sheet macroenabled 12       case  xlsx   return  application vnd openxmlformats-officedocument spreadsheetml sheet       case  xlt   return  application vnd ms-excel       case  xltm   return  application vnd ms-excel template macroenabled 12       case  xltx   return  application vnd openxmlformats-officedocument spreadsheetml template       case  xlw   return  application vnd ms-excel       case  xml   return  text xml       case  xmta   return  application xml       case  xof   return  x-world x-vrml       case  xoml   return  text plain       case  xpm   return  image x-xpixmap       case  xps   return  application vnd ms-xpsdocument       case  xrm-ms   return  text xml       case  xsc   return  application xml       case  xsd   return  text xml       case  xsf   return  text xml       case  xsl   return  text xml       case  xslt   return  text xml       case  xsn   return  application octet-stream       case  xss   return  application xml       case  xtp   return  application octet-stream       case  xwd   return  image x-xwindowdump       case  z   return  application x-compress       case  zip   return  application x-zip-compressed      endregion     default  return  application octet-stream

User · Answer

would be better if someone can use similar features as in libmagic on linux, as that is what I guess a better way to detect types of files than relaying on the extension name of a file.

For example, if I rename a file from mypicture.jpg to mypicture.txt On linux, it will still be reported as a picture But using this methodology here, it will be reported as text file.

Regards Tomas

User · Answer

Use MimeTypeMap package  which provides a huge two-way mapping of file extensions to mime types and mime types to file extensions  using MimeTypes   Getting the mime type to an extension  Console WriteLine  txt - gt      MimeTypeMap GetMimeType  txt          text plain    Getting the extension to a mime type  Console WriteLine  audio wav - gt      MimeTypeMap GetExtension  audio wav          wav    GitHub Url  https   github com samuelneff MimeTypeMap

User · Answer

I ve written a program to fetch and convert the Apache mime types file to a C  Dictionary lt string  string gt  keyed by file extension  It s here   The actual output is this file  but you might want to grab it and run it again in case the Apache file has been updated since I last ran this    public static Dictionary lt string  string gt  MimeTypes   new Dictionary lt string  string gt         123    application vnd lotus-1-2-3          3dml    text vnd in3d 3dml          3g2    video 3gpp2          3gp    video 3gpp          7z    application x-7z-compressed          aab    application x-authorware-bin          aac    audio x-aac          aam    application x-authorware-map          aas    application x-authorware-seg          abw    application x-abiword

User · Answer

If you do not want to add additional dependencies and still want version-independent requests, you can mix this answer on how to get the MIME-Type in different .NET versions with this answer on conditional builds for multiple .NET Framework versions.

First thing I did was editing my project file. After the last build definition, I added the property group as stated in the second answer:

<PropertyGroup>
    <DefineConstants Condition=" !$(DefineConstants.Contains(';NET')) ">$(DefineConstants);$(TargetFrameworkVersion.Replace("v", "NET").Replace(".", ""))</DefineConstants>
    <DefineConstants Condition=" $(DefineConstants.Contains(';NET')) ">$(DefineConstants.Remove($(DefineConstants.LastIndexOf(";NET"))));$(TargetFrameworkVersion.Replace("v", "NET").Replace(".", ""))</DefineConstants>
</PropertyGroup>

Now I provided a different implementations for the MimeExtensionHelper from the first answer, with an additional one for all clients from .NET 4.5 or later simply calling System.Web.MimeMapping.GetMimeMapping:

#if (NET10 || NET11 || NET20 || NET30 || NET35)
public static class MimeExtensionHelper
{
    static object locker = new object();
    static MethodInfo getMimeMappingMethodInfo;

    static MimeExtensionHelper()
    {
        Type mimeMappingType = Assembly.GetAssembly(typeof(HttpRuntime)).GetType("System.Web.MimeMapping");

        if (mimeMappingType == null)
            throw new SystemException("Couldnt find MimeMapping type");

        ConstructorInfo constructorInfo = mimeMappingType.GetConstructor(BindingFlags.NonPublic | BindingFlags.Instance, null, Type.EmptyTypes, null);

        if (constructorInfo == null)
            throw new SystemException("Couldnt find default constructor for MimeMapping");

        mimeMapping = constructorInfo.Invoke(null);

        if (mimeMapping == null)
            throw new SystemException("Couldnt find MimeMapping");

        getMimeMappingMethodInfo = mimeMappingType.GetMethod("GetMimeMapping", BindingFlags.Static | BindingFlags.NonPublic);

        if (getMimeMappingMethodInfo == null)
            throw new SystemException("Couldnt find GetMimeMapping method");

        if (getMimeMappingMethodInfo.ReturnType != typeof(string))
            throw new SystemException("GetMimeMapping method has invalid return type");

        if (getMimeMappingMethodInfo.GetParameters().Length != 1 && getMimeMappingMethodInfo.GetParameters()[0].ParameterType != typeof(string))
            throw new SystemException("GetMimeMapping method has invalid parameters");
    }

    public static string GetMimeType(string fileName)
    {
        lock (locker)
        {
            return (string)getMimeMappingMethodInfo.Invoke(null, new object[] { fileName });
        }
    }
}
#elif NET40
public static class MimeExtensionHelper
{
    static object locker = new object();
    static MethodInfo getMimeMappingMethodInfo;

    static MimeExtensionHelper()
    {
        Type mimeMappingType = Assembly.GetAssembly(typeof(HttpRuntime)).GetType("System.Web.MimeMapping");

        if (mimeMappingType == null)
            throw new SystemException("Couldnt find MimeMapping type");           

        getMimeMappingMethodInfo = mimeMappingType.GetMethod("GetMimeMapping", BindingFlags.Static | BindingFlags.NonPublic | BindingFlags.Public);

        if (getMimeMappingMethodInfo == null)
            throw new SystemException("Couldnt find GetMimeMapping method");

        if (getMimeMappingMethodInfo.ReturnType != typeof(string))
            throw new SystemException("GetMimeMapping method has invalid return type");

        if (getMimeMappingMethodInfo.GetParameters().Length != 1 && getMimeMappingMethodInfo.GetParameters()[0].ParameterType != typeof(string))
            throw new SystemException("GetMimeMapping method has invalid parameters");
    }

    public static string GetMimeType(string fileName)
    {
        lock (locker)
        {
            return (string)getMimeMappingMethodInfo.Invoke(null, new object[] { fileName });
        }
    }
}
#else // .NET 4.5 or later
public static class MimeExtensionHelper
{
    public static string GetMimeType(string fileName)
    {
        return MimeMapping.GetMimeMapping(fileName);
    }
}
#endif

Also in the versions prior to .NET 4.5, the static MimeMapping class hosts an static instance called _mappingDictionary (of type MimeMapping.MimeMappingDictionaryBase) which you can request from Reflection in order to add new MIME-Types that may not yet be supported.

User · Answer

It is always not necessary that the mime type calculated by the extention of the file will be always right.

lets say i can save a file with .png extention but the fileformat i can set as "ImageFormat.jpeg".

So in this case the file which you will be calculating, will give a different result... it may result in big size file than the original.

If you are working with images then you can use the imagecodecInfo and ImageFormat.

User · Answer

You can use this  helper function   private string GetMimeType  string fileName        string mimeType    application unknown       string ext   System IO Path GetExtension fileName  ToLower        Microsoft Win32 RegistryKey regKey   Microsoft Win32 Registry ClassesRoot OpenSubKey ext       if  regKey    null  amp  amp  regKey GetValue  Content Type      null      mimeType   regKey GetValue  Content Type   ToString        return mimeType

User · Answer

I have compiled a list of reputable sources for mime type and content type values that are keyed solely on file extension (currently).

The nuget package is here https://www.nuget.org/packages/FTTLib.dll/

and source is here https://github.com/brondavies/filetypetranslator/

This library is designed to have:

No external dependencies
No file system access
Small memory footprint
Simple static methods (no extension methods and no instantiatable classes)
Case-insensitive
Portable - works in applications targeting any CLR (.NET 2.0+)

User · Answer

You can find that information in the registry  For instance  the MIME type for  pdf file can be found in the key HKEY CLASSES ROOT  pdf  in the value  Content Type     string mimeType   Registry GetValue   HKEY CLASSES ROOT  pdf    Content Type   null  as string

User · Answer

IANA media types I wish Microsoft would get their industry standard act together  For others  anyone interested  Discrete types  application  https   www iana org assignments media-types media-types xhtml application audio  https   www iana org assignments media-types media-types xhtml audio example  https   www iana org assignments media-types media-types xhtml examples font  https   www iana org assignments media-types media-types xhtml font image  https   www iana org assignments media-types media-types xhtml image model  https   www iana org assignments media-types media-types xhtml model text  https   www iana org assignments media-types media-types xhtml text video  https   www iana org assignments media-types media-types xhtml video  Multipart types  message  https   www iana org assignments media-types media-types xhtml message multipart  https   www iana org assignments media-types media-types xhtml multipart  I would like to recommend a read of the  MIME types  IANA media types  Mozilla Page for those interested  Its very informative  Code wise  each of the above links has a  csv file download  https   www iana org assignments media-types application csv As already pointed out here  a Dictionary or a ConcurrentDictionary  may be an idea for Download and Populate the Dictionary with Key Value pairs

User · Answer

I know the question is for C  I just want to left in Javascript format because i just converted the Samuel s answer   export const contentTypes        323    text h323     3g2    video 3gpp2     3gp    video 3gpp     3gp2    video 3gpp2     3gpp    video 3gpp     7z    application x-7z-compressed     aa    audio audible     AAC    audio aac     aaf    application octet-stream     aax    audio vnd audible aax     ac3    audio ac3     aca    application octet-stream     accda    application msaccess addin     accdb    application msaccess     accdc    application msaccess cab     accde    application msaccess     accdr    application msaccess runtime     accdt    application msaccess     accdw    application msaccess webapplication     accft    application msaccess ftemplate     acx    application internet-property-stream     AddIn    text xml     ade    application msaccess     adobebridge    application x-bridge-url     adp    application msaccess     ADT    audio vnd dlna adts     ADTS    audio aac     afm    application octet-stream     ai    application postscript     aif    audio x-aiff     aifc    audio aiff     aiff    audio aiff     air    application vnd adobe air-application-installer-package zip     amc    application x-mpeg     application    application x-ms-application     art    image x-jg     asa    application xml     asax    application xml     ascx    application xml     asd    application octet-stream     asf    video x-ms-asf     ashx    application xml     asi    application octet-stream     asm    text plain     asmx    application xml     aspx    application xml     asr    video x-ms-asf     asx    video x-ms-asf     atom    application atom xml     au    audio basic     avi    video x-msvideo     axs    application olescript     bas    text plain     bcpio    application x-bcpio     bin    application octet-stream     bmp    image bmp     c    text plain     cab    application octet-stream     caf    audio x-caf     calx    application vnd ms-office calx     cat    application vnd ms-pki seccat     cc    text plain     cd    text plain     cdda    audio aiff     cdf    application x-cdf     cer    application x-x509-ca-cert     chm    application octet-stream     class    application x-java-applet     clp    application x-msclip     cmx    image x-cmx     cnf    text plain     cod    image cis-cod     config    application xml     contact    text x-ms-contact     coverage    application xml     cpio    application x-cpio     cpp    text plain     crd    application x-mscardfile     crl    application pkix-crl     crt    application x-x509-ca-cert     cs    text plain     csdproj    text plain     csh    application x-csh     csproj    text plain     css    text css     csv    text csv     cur    application octet-stream     cxx    text plain     dat    application octet-stream     datasource    application xml     dbproj    text plain     dcr    application x-director     def    text plain     deploy    application octet-stream     der    application x-x509-ca-cert     dgml    application xml     dib    image bmp     dif    video x-dv     dir    application x-director     disco    text xml     dll    application x-msdownload     dll config    text xml     dlm    text dlm     doc    application msword     docm    application vnd ms-word document macroEnabled 12     docx    application vnd openxmlformats-officedocument wordprocessingml document     dot    application msword     dotm    application vnd ms-word template macroEnabled 12     dotx    application vnd openxmlformats-officedocument wordprocessingml template     dsp    application octet-stream     dsw    text plain     dtd    text xml     dtsConfig    text xml     dv    video x-dv     dvi    application x-dvi     dwf    drawing x-dwf     dwp    application octet-stream     dxr    application x-director     eml    message rfc822     emz    application octet-stream     eot    application octet-stream     eps    application postscript     etl    application etl     etx    text x-setext     evy    application envoy     exe    application octet-stream     exe config    text xml     fdf    application vnd fdf     fif    application fractals     filters    Application xml     fla    application octet-stream     flr    x-world x-vrml     flv    video x-flv     fsscript    application fsharp-script     fsx    application fsharp-script     generictest    application xml     gif    image gif     group    text x-ms-group     gsm    audio x-gsm     gtar    application x-gtar     gz    application x-gzip     h    text plain     hdf    application x-hdf     hdml    text x-hdml     hhc    application x-oleobject     hhk    application octet-stream     hhp    application octet-stream     hlp    application winhlp     hpp    text plain     hqx    application mac-binhex40     hta    application hta     htc    text x-component     htm    text html     html    text html     htt    text webviewhtml     hxa    application xml     hxc    application xml     hxd    application octet-stream     hxe    application xml     hxf    application xml     hxh    application octet-stream     hxi    application octet-stream     hxk    application xml     hxq    application octet-stream     hxr    application octet-stream     hxs    application octet-stream     hxt    text html     hxv    application xml     hxw    application octet-stream     hxx    text plain     i    text plain     ico    image x-icon     ics    application octet-stream     idl    text plain     ief    image ief     iii    application x-iphone     inc    text plain     inf    application octet-stream     inl    text plain     ins    application x-internet-signup     ipa    application x-itunes-ipa     ipg    application x-itunes-ipg     ipproj    text plain     ipsw    application x-itunes-ipsw     iqy    text x-ms-iqy     isp    application x-internet-signup     ite    application x-itunes-ite     itlp    application x-itunes-itlp     itms    application x-itunes-itms     itpc    application x-itunes-itpc     IVF    video x-ivf     jar    application java-archive     java    application octet-stream     jck    application liquidmotion     jcz    application liquidmotion     jfif    image pjpeg     jnlp    application x-java-jnlp-file     jpb    application octet-stream     jpe    image jpeg     jpeg    image jpeg     jpg    image jpeg     js    application x-javascript     json    application json     jsx    text jscript     jsxbin    text plain     latex    application x-latex     library-ms    application windows-library xml     lit    application x-ms-reader     loadtest    application xml     lpk    application octet-stream     lsf    video x-la-asf     lst    text plain     lsx    video x-la-asf     lzh    application octet-stream     m13    application x-msmediaview     m14    application x-msmediaview     m1v    video mpeg     m2t    video vnd dlna mpeg-tts     m2ts    video vnd dlna mpeg-tts     m2v    video mpeg     m3u    audio x-mpegurl     m3u8    audio x-mpegurl     m4a    audio m4a     m4b    audio m4b     m4p    audio m4p     m4r    audio x-m4r     m4v    video x-m4v     mac    image x-macpaint     mak    text plain     man    application x-troff-man     manifest    application x-ms-manifest     map    text plain     master    application xml     mda    application msaccess     mdb    application x-msaccess     mde    application msaccess     mdp    application octet-stream     me    application x-troff-me     mfp    application x-shockwave-flash     mht    message rfc822     mhtml    message rfc822     mid    audio mid     midi    audio mid     mix    application octet-stream     mk    text plain     mmf    application x-smaf     mno    text xml     mny    application x-msmoney     mod    video mpeg     mov    video quicktime     movie    video x-sgi-movie     mp2    video mpeg     mp2v    video mpeg     mp3    audio mpeg     mp4    video mp4     mp4v    video mp4     mpa    video mpeg     mpe    video mpeg     mpeg    video mpeg     mpf    application vnd ms-mediapackage     mpg    video mpeg     mpp    application vnd ms-project     mpv2    video mpeg     mqv    video quicktime     ms    application x-troff-ms     msi    application octet-stream     mso    application octet-stream     mts    video vnd dlna mpeg-tts     mtx    application xml     mvb    application x-msmediaview     mvc    application x-miva-compiled     mxp    application x-mmxp     nc    application x-netcdf     nsc    video x-ms-asf     nws    message rfc822     ocx    application octet-stream     oda    application oda     odc    text x-ms-odc     odh    text plain     odl    text plain     odp    application vnd oasis opendocument presentation     ods    application oleobject     odt    application vnd oasis opendocument text     one    application onenote     onea    application onenote     onepkg    application onenote     onetmp    application onenote     onetoc    application onenote     onetoc2    application onenote     orderedtest    application xml     osdx    application opensearchdescription xml     p10    application pkcs10     p12    application x-pkcs12     p7b    application x-pkcs7-certificates     p7c    application pkcs7-mime     p7m    application pkcs7-mime     p7r    application x-pkcs7-certreqresp     p7s    application pkcs7-signature     pbm    image x-portable-bitmap     pcast    application x-podcast     pct    image pict     pcx    application octet-stream     pcz    application octet-stream     pdf    application pdf     pfb    application octet-stream     pfm    application octet-stream     pfx    application x-pkcs12     pgm    image x-portable-graymap     pic    image pict     pict    image pict     pkgdef    text plain     pkgundef    text plain     pko    application vnd ms-pki pko     pls    audio scpls     pma    application x-perfmon     pmc    application x-perfmon     pml    application x-perfmon     pmr    application x-perfmon     pmw    application x-perfmon     png    image png     pnm    image x-portable-anymap     pnt    image x-macpaint     pntg    image x-macpaint     pnz    image png     pot    application vnd ms-powerpoint     potm    application vnd ms-powerpoint template macroEnabled 12     potx    application vnd openxmlformats-officedocument presentationml template     ppa    application vnd ms-powerpoint     ppam    application vnd ms-powerpoint addin macroEnabled 12     ppm    image x-portable-pixmap     pps    application vnd ms-powerpoint     ppsm    application vnd ms-powerpoint slideshow macroEnabled 12     ppsx    application vnd openxmlformats-officedocument presentationml slideshow     ppt    application vnd ms-powerpoint     pptm    application vnd ms-powerpoint presentation macroEnabled 12     pptx    application vnd openxmlformats-officedocument presentationml presentation     prf    application pics-rules     prm    application octet-stream     prx    application octet-stream     ps    application postscript     psc1    application PowerShell     psd    application octet-stream     psess    application xml     psm    application octet-stream     psp    application octet-stream     pub    application x-mspublisher     pwz    application vnd ms-powerpoint     qht    text x-html-insertion     qhtm    text x-html-insertion     qt    video quicktime     qti    image x-quicktime     qtif    image x-quicktime     qtl    application x-quicktimeplayer     qxd    application octet-stream     ra    audio x-pn-realaudio     ram    audio x-pn-realaudio     rar    application octet-stream     ras    image x-cmu-raster     rat    application rat-file     rc    text plain     rc2    text plain     rct    text plain     rdlc    application xml     resx    application xml     rf    image vnd rn-realflash     rgb    image x-rgb     rgs    text plain     rm    application vnd rn-realmedia     rmi    audio mid     rmp    application vnd rn-rn music package     roff    application x-troff     rpm    audio x-pn-realaudio-plugin     rqy    text x-ms-rqy     rtf    application rtf     rtx    text richtext     ruleset    application xml     s    text plain     safariextz    application x-safari-safariextz     scd    application x-msschedule     sct    text scriptlet     sd2    audio x-sd2     sdp    application sdp     sea    application octet-stream     searchConnector-ms    application windows-search-connector xml     setpay    application set-payment-initiation     setreg    application set-registration-initiation     settings    application xml     sgimb    application x-sgimb     sgml    text sgml     sh    application x-sh     shar    application x-shar     shtml    text html     sit    application x-stuffit     sitemap    application xml     skin    application xml     sldm    application vnd ms-powerpoint slide macroEnabled 12     sldx    application vnd openxmlformats-officedocument presentationml slide     slk    application vnd ms-excel     sln    text plain     slupkg-ms    application x-ms-license     smd    audio x-smd     smi    application octet-stream     smx    audio x-smd     smz    audio x-smd     snd    audio basic     snippet    application xml     snp    application octet-stream     sol    text plain     sor    text plain     spc    application x-pkcs7-certificates     spl    application futuresplash     src    application x-wais-source     srf    text plain     SSISDeploymentManifest    text xml     ssm    application streamingmedia     sst    application vnd ms-pki certstore     stl    application vnd ms-pki stl     sv4cpio    application x-sv4cpio     sv4crc    application x-sv4crc     svc    application xml     swf    application x-shockwave-flash     t    application x-troff     tar    application x-tar     tcl    application x-tcl     testrunconfig    application xml     testsettings    application xml     tex    application x-tex     texi    application x-texinfo     texinfo    application x-texinfo     tgz    application x-compressed     thmx    application vnd ms-officetheme     thn    application octet-stream     tif    image tiff     tiff    image tiff     tlh    text plain     tli    text plain     toc    application octet-stream     tr    application x-troff     trm    application x-msterminal     trx    application xml     ts    video vnd dlna mpeg-tts     tsv    text tab-separated-values     ttf    application octet-stream     tts    video vnd dlna mpeg-tts     txt    text plain     u32    application octet-stream     uls    text iuls     user    text plain     ustar    application x-ustar     vb    text plain     vbdproj    text plain     vbk    video mpeg     vbproj    text plain     vbs    text vbscript     vcf    text x-vcard     vcproj    Application xml     vcs    text plain     vcxproj    Application xml     vddproj    text plain     vdp    text plain     vdproj    text plain     vdx    application vnd ms-visio viewer     vml    text xml     vscontent    application xml     vsct    text xml     vsd    application vnd visio     vsi    application ms-vsi     vsix    application vsix     vsixlangpack    text xml     vsixmanifest    text xml     vsmdi    application xml     vspscc    text plain     vss    application vnd visio     vsscc    text plain     vssettings    text xml     vssscc    text plain     vst    application vnd visio     vstemplate    text xml     vsto    application x-ms-vsto     vsw    application vnd visio     vsx    application vnd visio     vtx    application vnd visio     wav    audio wav     wave    audio wav     wax    audio x-ms-wax     wbk    application msword     wbmp    image vnd wap wbmp     wcm    application vnd ms-works     wdb    application vnd ms-works     wdp    image vnd ms-photo     webarchive    application x-safari-webarchive     webtest    application xml     wiq    application xml     wiz    application msword     wks    application vnd ms-works     WLMP    application wlmoviemaker     wlpginstall    application x-wlpg-detect     wlpginstall3    application x-wlpg3-detect     wm    video x-ms-wm     wma    audio x-ms-wma     wmd    application x-ms-wmd     wmf    application x-msmetafile     wml    text vnd wap wml     wmlc    application vnd wap wmlc     wmls    text vnd wap wmlscript     wmlsc    application vnd wap wmlscriptc     wmp    video x-ms-wmp     wmv    video x-ms-wmv     wmx    video x-ms-wmx     wmz    application x-ms-wmz     wpl    application vnd ms-wpl     wps    application vnd ms-works     wri    application x-mswrite     wrl    x-world x-vrml     wrz    x-world x-vrml     wsc    text scriptlet     wsdl    text xml     wvx    video x-ms-wvx     x    application directx     xaf    x-world x-vrml     xaml    application xaml xml     xap    application x-silverlight-app     xbap    application x-ms-xbap     xbm    image x-xbitmap     xdr    text plain     xht    application xhtml xml     xhtml    application xhtml xml     xla    application vnd ms-excel     xlam    application vnd ms-excel addin macroEnabled 12     xlc    application vnd ms-excel     xld    application vnd ms-excel     xlk    application vnd ms-excel     xll    application vnd ms-excel     xlm    application vnd ms-excel     xls    application vnd ms-excel     xlsb    application vnd ms-excel sheet binary macroEnabled 12     xlsm    application vnd ms-excel sheet macroEnabled 12     xlsx    application vnd openxmlformats-officedocument spreadsheetml sheet     xlt    application vnd ms-excel     xltm    application vnd ms-excel template macroEnabled 12     xltx    application vnd openxmlformats-officedocument spreadsheetml template     xlw    application vnd ms-excel     xml    text xml     xmta    application xml     xof    x-world x-vrml     XOML    text plain     xpm    image x-xpixmap     xps    application vnd ms-xpsdocument     xrm-ms    text xml     xsc    application xml     xsd    text xml     xsf    text xml     xsl    text xml     xslt    text xml     xsn    application octet-stream     xss    application xml     xtp    application octet-stream     xwd    image x-xwindowdump     z    application x-compress     zip    application x-zip-compressed

User · Answer

Most of the solutions are working but why take so efforts while we also can get mime type very easily  In System Web assembly  there is method for getting the mime type from file name  eg   string mimeType   MimeMapping GetMimeMapping filename

User · Answer

Certainly  for combining the advantage of common completeness  dynamics and portability with minimum dependency you will combine Samuel Neff s static dictionary with a platform specific query as e g  by Bryan Denny  E g  under Linux command line tool   xdg-mime   might do the latter part

User · Answer

Inspired by Samuel s answer  I wrote an improved version    Also works when extension is uppercase  Take filename as input  handle files without extensions gracefully  Don t include     in keys  List from Apache  for which I wrote a small transformation script    The resulting source code is over 30K characters so I can t post it here  check it on Github

User · Answer

Just to make Shimmy s answer more clear   var mimeType   MimeMapping GetMimeMapping fileName       System Web dll v4 5     Summary         Returns the MIME mapping for the specified file name        Parameters       fileName         The file name that is used to determine the MIME type  public static string GetMimeMapping string fileName

User · Answer

a combination of both solutions presented here   using System  using System Collections Generic   namespace Mime       class Mime                public static string GetMimeType string fileName                        if  string IsNullOrEmpty fileName     string IsNullOrWhiteSpace fileName                                 throw new ArgumentNullException  filename must contain a filename                              string extension   System IO Path GetExtension fileName  ToLower                 if   extension StartsWith                                     extension         extension                              string mime               if   mappings TryGetValue extension  out mime                   return mime              if  GetWindowsMimeType extension  out mime                                  mappings Add extension  mime                   return mime                            return  application octet-stream                      public static bool GetWindowsMimeType string ext  out string mime                        mime  application octet-stream               Microsoft Win32 RegistryKey regKey   Microsoft Win32 Registry ClassesRoot OpenSubKey ext                if  regKey    null                              object val regKey GetValue  Content Type                  if  val    null                                  string strval   val ToString                     if   string IsNullOrEmpty strval   string IsNullOrWhiteSpace strval                                            mime strval                       return true                                                              return false                     static IDictionary lt string  string gt   mappings   new Dictionary lt string  string gt  StringComparer InvariantCultureIgnoreCase              region Big freaking list of mime types            combination of values from Windows 7 Registry and             from C  Windows System32 inetsrv config applicationHost config            some added  including  7z and  dat            323    text h323               3g2    video 3gpp2               3gp    video 3gpp               3gp2    video 3gpp2               3gpp    video 3gpp               7z    application x-7z-compressed               aa    audio audible               AAC    audio aac               aaf    application octet-stream               aax    audio vnd audible aax               ac3    audio ac3               aca    application octet-stream               accda    application msaccess addin               accdb    application msaccess               accdc    application msaccess cab               accde    application msaccess               accdr    application msaccess runtime               accdt    application msaccess               accdw    application msaccess webapplication               accft    application msaccess ftemplate               acx    application internet-property-stream               AddIn    text xml               ade    application msaccess               adobebridge    application x-bridge-url               adp    application msaccess               ADT    audio vnd dlna adts               ADTS    audio aac               afm    application octet-stream               ai    application postscript               aif    audio x-aiff               aifc    audio aiff               aiff    audio aiff               air    application vnd adobe air-application-installer-package zip               amc    application x-mpeg               application    application x-ms-application               art    image x-jg               asa    application xml               asax    application xml               ascx    application xml               asd    application octet-stream               asf    video x-ms-asf               ashx    application xml               asi    application octet-stream               asm    text plain               asmx    application xml               aspx    application xml               asr    video x-ms-asf               asx    video x-ms-asf               atom    application atom xml               au    audio basic               avi    video x-msvideo               axs    application olescript               bas    text plain               bcpio    application x-bcpio               bin    application octet-stream               bmp    image bmp               c    text plain               cab    application octet-stream               caf    audio x-caf               calx    application vnd ms-office calx               cat    application vnd ms-pki seccat               cc    text plain               cd    text plain               cdda    audio aiff               cdf    application x-cdf               cer    application x-x509-ca-cert               chm    application octet-stream               class    application x-java-applet               clp    application x-msclip               cmx    image x-cmx               cnf    text plain               cod    image cis-cod               config    application xml               contact    text x-ms-contact               coverage    application xml               cpio    application x-cpio               cpp    text plain               crd    application x-mscardfile               crl    application pkix-crl               crt    application x-x509-ca-cert               cs    text plain               csdproj    text plain               csh    application x-csh               csproj    text plain               css    text css               csv    text csv               cur    application octet-stream               cxx    text plain               dat    application octet-stream               datasource    application xml               dbproj    text plain               dcr    application x-director               def    text plain               deploy    application octet-stream               der    application x-x509-ca-cert               dgml    application xml               dib    image bmp               dif    video x-dv               dir    application x-director               disco    text xml               dll    application x-msdownload               dll config    text xml               dlm    text dlm               doc    application msword               docm    application vnd ms-word document macroEnabled 12               docx    application vnd openxmlformats-officedocument wordprocessingml document               dot    application msword               dotm    application vnd ms-word template macroEnabled 12               dotx    application vnd openxmlformats-officedocument wordprocessingml template               dsp    application octet-stream               dsw    text plain               dtd    text xml               dtsConfig    text xml               dv    video x-dv               dvi    application x-dvi               dwf    drawing x-dwf               dwp    application octet-stream               dxr    application x-director               eml    message rfc822               emz    application octet-stream               eot    application octet-stream               eps    application postscript               etl    application etl               etx    text x-setext               evy    application envoy               exe    application octet-stream               exe config    text xml               fdf    application vnd fdf               fif    application fractals               filters    Application xml               fla    application octet-stream               flr    x-world x-vrml               flv    video x-flv               fsscript    application fsharp-script               fsx    application fsharp-script               generictest    application xml               gif    image gif               group    text x-ms-group               gsm    audio x-gsm               gtar    application x-gtar               gz    application x-gzip               h    text plain               hdf    application x-hdf               hdml    text x-hdml               hhc    application x-oleobject               hhk    application octet-stream               hhp    application octet-stream               hlp    application winhlp               hpp    text plain               hqx    application mac-binhex40               hta    application hta               htc    text x-component               htm    text html               html    text html               htt    text webviewhtml               hxa    application xml               hxc    application xml               hxd    application octet-stream               hxe    application xml               hxf    application xml               hxh    application octet-stream               hxi    application octet-stream               hxk    application xml               hxq    application octet-stream               hxr    application octet-stream               hxs    application octet-stream               hxt    text html               hxv    application xml               hxw    application octet-stream               hxx    text plain               i    text plain               ico    image x-icon               ics    application octet-stream               idl    text plain               ief    image ief               iii    application x-iphone               inc    text plain               inf    application octet-stream               inl    text plain               ins    application x-internet-signup               ipa    application x-itunes-ipa               ipg    application x-itunes-ipg               ipproj    text plain               ipsw    application x-itunes-ipsw               iqy    text x-ms-iqy               isp    application x-internet-signup               ite    application x-itunes-ite               itlp    application x-itunes-itlp               itms    application x-itunes-itms               itpc    application x-itunes-itpc               IVF    video x-ivf               jar    application java-archive               java    application octet-stream               jck    application liquidmotion               jcz    application liquidmotion               jfif    image pjpeg               jnlp    application x-java-jnlp-file               jpb    application octet-stream               jpe    image jpeg               jpeg    image jpeg               jpg    image jpeg               js    application x-javascript               jsx    text jscript               jsxbin    text plain               latex    application x-latex               library-ms    application windows-library xml               lit    application x-ms-reader               loadtest    application xml               lpk    application octet-stream               lsf    video x-la-asf               lst    text plain               lsx    video x-la-asf               lzh    application octet-stream               m13    application x-msmediaview               m14    application x-msmediaview               m1v    video mpeg               m2t    video vnd dlna mpeg-tts               m2ts    video vnd dlna mpeg-tts               m2v    video mpeg               m3u    audio x-mpegurl               m3u8    audio x-mpegurl               m4a    audio m4a               m4b    audio m4b               m4p    audio m4p               m4r    audio x-m4r               m4v    video x-m4v               mac    image x-macpaint               mak    text plain               man    application x-troff-man               manifest    application x-ms-manifest               map    text plain               master    application xml               mda    application msaccess               mdb    application x-msaccess               mde    application msaccess               mdp    application octet-stream               me    application x-troff-me               mfp    application x-shockwave-flash               mht    message rfc822               mhtml    message rfc822               mid    audio mid               midi    audio mid               mix    application octet-stream               mk    text plain               mmf    application x-smaf               mno    text xml               mny    application x-msmoney               mod    video mpeg               mov    video quicktime               movie    video x-sgi-movie               mp2    video mpeg               mp2v    video mpeg               mp3    audio mpeg               mp4    video mp4               mp4v    video mp4               mpa    video mpeg               mpe    video mpeg               mpeg    video mpeg               mpf    application vnd ms-mediapackage               mpg    video mpeg               mpp    application vnd ms-project               mpv2    video mpeg               mqv    video quicktime               ms    application x-troff-ms               msi    application octet-stream               mso    application octet-stream               mts    video vnd dlna mpeg-tts               mtx    application xml               mvb    application x-msmediaview               mvc    application x-miva-compiled               mxp    application x-mmxp               nc    application x-netcdf               nsc    video x-ms-asf               nws    message rfc822               ocx    application octet-stream               oda    application oda               odc    text x-ms-odc               odh    text plain               odl    text plain               odp    application vnd oasis opendocument presentation               ods    application oleobject               odt    application vnd oasis opendocument text               one    application onenote               onea    application onenote               onepkg    application onenote               onetmp    application onenote               onetoc    application onenote               onetoc2    application onenote               orderedtest    application xml               osdx    application opensearchdescription xml               p10    application pkcs10               p12    application x-pkcs12               p7b    application x-pkcs7-certificates               p7c    application pkcs7-mime               p7m    application pkcs7-mime               p7r    application x-pkcs7-certreqresp               p7s    application pkcs7-signature               pbm    image x-portable-bitmap               pcast    application x-podcast               pct    image pict               pcx    application octet-stream               pcz    application octet-stream               pdf    application pdf               pfb    application octet-stream               pfm    application octet-stream               pfx    application x-pkcs12               pgm    image x-portable-graymap               pic    image pict               pict    image pict               pkgdef    text plain               pkgundef    text plain               pko    application vnd ms-pki pko               pls    audio scpls               pma    application x-perfmon               pmc    application x-perfmon               pml    application x-perfmon               pmr    application x-perfmon               pmw    application x-perfmon               png    image png               pnm    image x-portable-anymap               pnt    image x-macpaint               pntg    image x-macpaint               pnz    image png               pot    application vnd ms-powerpoint               potm    application vnd ms-powerpoint template macroEnabled 12               potx    application vnd openxmlformats-officedocument presentationml template               ppa    application vnd ms-powerpoint               ppam    application vnd ms-powerpoint addin macroEnabled 12               ppm    image x-portable-pixmap               pps    application vnd ms-powerpoint               ppsm    application vnd ms-powerpoint slideshow macroEnabled 12               ppsx    application vnd openxmlformats-officedocument presentationml slideshow               ppt    application vnd ms-powerpoint               pptm    application vnd ms-powerpoint presentation macroEnabled 12               pptx    application vnd openxmlformats-officedocument presentationml presentation               prf    application pics-rules               prm    application octet-stream               prx    application octet-stream               ps    application postscript               psc1    application PowerShell               psd    application octet-stream               psess    application xml               psm    application octet-stream               psp    application octet-stream               pub    application x-mspublisher               pwz    application vnd ms-powerpoint               qht    text x-html-insertion               qhtm    text x-html-insertion               qt    video quicktime               qti    image x-quicktime               qtif    image x-quicktime               qtl    application x-quicktimeplayer               qxd    application octet-stream               ra    audio x-pn-realaudio               ram    audio x-pn-realaudio               rar    application octet-stream               ras    image x-cmu-raster               rat    application rat-file               rc    text plain               rc2    text plain               rct    text plain               rdlc    application xml               resx    application xml               rf    image vnd rn-realflash               rgb    image x-rgb               rgs    text plain               rm    application vnd rn-realmedia               rmi    audio mid               rmp    application vnd rn-rn music package               roff    application x-troff               rpm    audio x-pn-realaudio-plugin               rqy    text x-ms-rqy               rtf    application rtf               rtx    text richtext               ruleset    application xml               s    text plain               safariextz    application x-safari-safariextz               scd    application x-msschedule               sct    text scriptlet               sd2    audio x-sd2               sdp    application sdp               sea    application octet-stream               searchConnector-ms    application windows-search-connector xml               setpay    application set-payment-initiation               setreg    application set-registration-initiation               settings    application xml               sgimb    application x-sgimb               sgml    text sgml               sh    application x-sh               shar    application x-shar               shtml    text html               sit    application x-stuffit               sitemap    application xml               skin    application xml               sldm    application vnd ms-powerpoint slide macroEnabled 12               sldx    application vnd openxmlformats-officedocument presentationml slide               slk    application vnd ms-excel               sln    text plain               slupkg-ms    application x-ms-license               smd    audio x-smd               smi    application octet-stream               smx    audio x-smd               smz    audio x-smd               snd    audio basic               snippet    application xml               snp    application octet-stream               sol    text plain               sor    text plain               spc    application x-pkcs7-certificates               spl    application futuresplash               src    application x-wais-source               srf    text plain               SSISDeploymentManifest    text xml               ssm    application streamingmedia               sst    application vnd ms-pki certstore               stl    application vnd ms-pki stl               sv4cpio    application x-sv4cpio               sv4crc    application x-sv4crc               svc    application xml               swf    application x-shockwave-flash               t    application x-troff               tar    application x-tar               tcl    application x-tcl               testrunconfig    application xml               testsettings    application xml               tex    application x-tex               texi    application x-texinfo               texinfo    application x-texinfo               tgz    application x-compressed               thmx    application vnd ms-officetheme               thn    application octet-stream               tif    image tiff               tiff    image tiff               tlh    text plain               tli    text plain               toc    application octet-stream               tr    application x-troff               trm    application x-msterminal               trx    application xml               ts    video vnd dlna mpeg-tts               tsv    text tab-separated-values               ttf    application octet-stream               tts    video vnd dlna mpeg-tts               txt    text plain               u32    application octet-stream               uls    text iuls               user    text plain               ustar    application x-ustar               vb    text plain               vbdproj    text plain               vbk    video mpeg               vbproj    text plain               vbs    text vbscript               vcf    text x-vcard               vcproj    Application xml               vcs    text plain               vcxproj    Application xml               vddproj    text plain               vdp    text plain               vdproj    text plain               vdx    application vnd ms-visio viewer               vml    text xml               vscontent    application xml               vsct    text xml               vsd    application vnd visio               vsi    application ms-vsi               vsix    application vsix               vsixlangpack    text xml               vsixmanifest    text xml               vsmdi    application xml               vspscc    text plain               vss    application vnd visio               vsscc    text plain               vssettings    text xml               vssscc    text plain               vst    application vnd visio               vstemplate    text xml               vsto    application x-ms-vsto               vsw    application vnd visio               vsx    application vnd visio               vtx    application vnd visio               wav    audio wav               wave    audio wav               wax    audio x-ms-wax               wbk    application msword               wbmp    image vnd wap wbmp               wcm    application vnd ms-works               wdb    application vnd ms-works               wdp    image vnd ms-photo               webarchive    application x-safari-webarchive               webtest    application xml               wiq    application xml               wiz    application msword               wks    application vnd ms-works               WLMP    application wlmoviemaker               wlpginstall    application x-wlpg-detect               wlpginstall3    application x-wlpg3-detect               wm    video x-ms-wm               wma    audio x-ms-wma               wmd    application x-ms-wmd               wmf    application x-msmetafile               wml    text vnd wap wml               wmlc    application vnd wap wmlc               wmls    text vnd wap wmlscript               wmlsc    application vnd wap wmlscriptc               wmp    video x-ms-wmp               wmv    video x-ms-wmv               wmx    video x-ms-wmx               wmz    application x-ms-wmz               wpl    application vnd ms-wpl               wps    application vnd ms-works               wri    application x-mswrite               wrl    x-world x-vrml               wrz    x-world x-vrml               wsc    text scriptlet               wsdl    text xml               wvx    video x-ms-wvx               x    application directx               xaf    x-world x-vrml               xaml    application xaml xml               xap    application x-silverlight-app               xbap    application x-ms-xbap               xbm    image x-xbitmap               xdr    text plain               xht    application xhtml xml               xhtml    application xhtml xml               xla    application vnd ms-excel               xlam    application vnd ms-excel addin macroEnabled 12               xlc    application vnd ms-excel               xld    application vnd ms-excel               xlk    application vnd ms-excel               xll    application vnd ms-excel               xlm    application vnd ms-excel               xls    application vnd ms-excel               xlsb    application vnd ms-excel sheet binary macroEnabled 12               xlsm    application vnd ms-excel sheet macroEnabled 12               xlsx    application vnd openxmlformats-officedocument spreadsheetml sheet               xlt    application vnd ms-excel               xltm    application vnd ms-excel template macroEnabled 12               xltx    application vnd openxmlformats-officedocument spreadsheetml template               xlw    application vnd ms-excel               xml    text xml               xmta    application xml               xof    x-world x-vrml               XOML    text plain               xpm    image x-xpixmap               xps    application vnd ms-xpsdocument               xrm-ms    text xml               xsc    application xml               xsd    text xml               xsf    text xml               xsl    text xml               xslt    text xml               xsn    application octet-stream               xss    application xml               xtp    application octet-stream               xwd    image x-xwindowdump               z    application x-compress               zip    application x-zip-compressed             endregion

User · Answer

UPDATE For up-to-date mapping with additions from many contributors  see this GitHub repository  https   github com samuelneff MimeTypeMap and NuGet package https   www nuget org packages MimeTypeMapOfficial   I ve found many mime types my application uses are not in the default Windows registry and others are in the registry but not in the list included with IIS   I ve compiled a list from these locations and added a few others that we use  EDIT  See most up-do-date version with contributions here  including an efficient and deterministic two-way mapping  private static IDictionary lt string  string gt   mappings   new Dictionary lt string  string gt  StringComparer InvariantCultureIgnoreCase              region Big freaking list of mime types            combination of values from Windows 7 Registry and             from C  Windows System32 inetsrv config applicationHost config            some added  including  7z and  dat           quot  323 quot    quot text h323 quot              quot  3g2 quot    quot video 3gpp2 quot              quot  3gp quot    quot video 3gpp quot              quot  3gp2 quot    quot video 3gpp2 quot              quot  3gpp quot    quot video 3gpp quot              quot  7z quot    quot application x-7z-compressed quot              quot  aa quot    quot audio audible quot              quot  AAC quot    quot audio aac quot              quot  aaf quot    quot application octet-stream quot              quot  aax quot    quot audio vnd audible aax quot              quot  ac3 quot    quot audio ac3 quot              quot  aca quot    quot application octet-stream quot              quot  accda quot    quot application msaccess addin quot              quot  accdb quot    quot application msaccess quot              quot  accdc quot    quot application msaccess cab quot              quot  accde quot    quot application msaccess quot              quot  accdr quot    quot application msaccess runtime quot              quot  accdt quot    quot application msaccess quot              quot  accdw quot    quot application msaccess webapplication quot              quot  accft quot    quot application msaccess ftemplate quot              quot  acx quot    quot application internet-property-stream quot              quot  AddIn quot    quot text xml quot              quot  ade quot    quot application msaccess quot              quot  adobebridge quot    quot application x-bridge-url quot              quot  adp quot    quot application msaccess quot              quot  ADT quot    quot audio vnd dlna adts quot              quot  ADTS quot    quot audio aac quot              quot  afm quot    quot application octet-stream quot              quot  ai quot    quot application postscript quot              quot  aif quot    quot audio x-aiff quot              quot  aifc quot    quot audio aiff quot              quot  aiff quot    quot audio aiff quot              quot  air quot    quot application vnd adobe air-application-installer-package zip quot              quot  amc quot    quot application x-mpeg quot              quot  application quot    quot application x-ms-application quot              quot  art quot    quot image x-jg quot              quot  asa quot    quot application xml quot              quot  asax quot    quot application xml quot              quot  ascx quot    quot application xml quot              quot  asd quot    quot application octet-stream quot              quot  asf quot    quot video x-ms-asf quot              quot  ashx quot    quot application xml quot              quot  asi quot    quot application octet-stream quot              quot  asm quot    quot text plain quot              quot  asmx quot    quot application xml quot              quot  aspx quot    quot application xml quot              quot  asr quot    quot video x-ms-asf quot              quot  asx quot    quot video x-ms-asf quot              quot  atom quot    quot application atom xml quot              quot  au quot    quot audio basic quot              quot  avi quot    quot video x-msvideo quot              quot  axs quot    quot application olescript quot              quot  bas quot    quot text plain quot              quot  bcpio quot    quot application x-bcpio quot              quot  bin quot    quot application octet-stream quot              quot  bmp quot    quot image bmp quot              quot  c quot    quot text plain quot              quot  cab quot    quot application octet-stream quot              quot  caf quot    quot audio x-caf quot              quot  calx quot    quot application vnd ms-office calx quot              quot  cat quot    quot application vnd ms-pki seccat quot              quot  cc quot    quot text plain quot              quot  cd quot    quot text plain quot              quot  cdda quot    quot audio aiff quot              quot  cdf quot    quot application x-cdf quot              quot  cer quot    quot application x-x509-ca-cert quot              quot  chm quot    quot application octet-stream quot              quot  class quot    quot application x-java-applet quot              quot  clp quot    quot application x-msclip quot              quot  cmx quot    quot image x-cmx quot              quot  cnf quot    quot text plain quot              quot  cod quot    quot image cis-cod quot              quot  config quot    quot application xml quot              quot  contact quot    quot text x-ms-contact quot              quot  coverage quot    quot application xml quot              quot  cpio quot    quot application x-cpio quot              quot  cpp quot    quot text plain quot              quot  crd quot    quot application x-mscardfile quot              quot  crl quot    quot application pkix-crl quot              quot  crt quot    quot application x-x509-ca-cert quot              quot  cs quot    quot text plain quot              quot  csdproj quot    quot text plain quot              quot  csh quot    quot application x-csh quot              quot  csproj quot    quot text plain quot              quot  css quot    quot text css quot              quot  csv quot    quot text csv quot              quot  cur quot    quot application octet-stream quot              quot  cxx quot    quot text plain quot              quot  dat quot    quot application octet-stream quot              quot  datasource quot    quot application xml quot              quot  dbproj quot    quot text plain quot              quot  dcr quot    quot application x-director quot              quot  def quot    quot text plain quot              quot  deploy quot    quot application octet-stream quot              quot  der quot    quot application x-x509-ca-cert quot              quot  dgml quot    quot application xml quot              quot  dib quot    quot image bmp quot              quot  dif quot    quot video x-dv quot              quot  dir quot    quot application x-director quot              quot  disco quot    quot text xml quot              quot  dll quot    quot application x-msdownload quot              quot  dll config quot    quot text xml quot              quot  dlm quot    quot text dlm quot              quot  doc quot    quot application msword quot              quot  docm quot    quot application vnd ms-word document macroEnabled 12 quot              quot  docx quot    quot application vnd openxmlformats-officedocument wordprocessingml document quot              quot  dot quot    quot application msword quot              quot  dotm quot    quot application vnd ms-word template macroEnabled 12 quot              quot  dotx quot    quot application vnd openxmlformats-officedocument wordprocessingml template quot              quot  dsp quot    quot application octet-stream quot              quot  dsw quot    quot text plain quot              quot  dtd quot    quot text xml quot              quot  dtsConfig quot    quot text xml quot              quot  dv quot    quot video x-dv quot              quot  dvi quot    quot application x-dvi quot              quot  dwf quot    quot drawing x-dwf quot              quot  dwp quot    quot application octet-stream quot              quot  dxr quot    quot application x-director quot              quot  eml quot    quot message rfc822 quot              quot  emz quot    quot application octet-stream quot              quot  eot quot    quot application octet-stream quot              quot  eps quot    quot application postscript quot              quot  etl quot    quot application etl quot              quot  etx quot    quot text x-setext quot              quot  evy quot    quot application envoy quot              quot  exe quot    quot application octet-stream quot              quot  exe config quot    quot text xml quot              quot  fdf quot    quot application vnd fdf quot              quot  fif quot    quot application fractals quot              quot  filters quot    quot Application xml quot              quot  fla quot    quot application octet-stream quot              quot  flr quot    quot x-world x-vrml quot              quot  flv quot    quot video x-flv quot              quot  fsscript quot    quot application fsharp-script quot              quot  fsx quot    quot application fsharp-script quot              quot  generictest quot    quot application xml quot              quot  gif quot    quot image gif quot              quot  group quot    quot text x-ms-group quot              quot  gsm quot    quot audio x-gsm quot              quot  gtar quot    quot application x-gtar quot              quot  gz quot    quot application x-gzip quot              quot  h quot    quot text plain quot              quot  hdf quot    quot application x-hdf quot              quot  hdml quot    quot text x-hdml quot              quot  hhc quot    quot application x-oleobject quot              quot  hhk quot    quot application octet-stream quot              quot  hhp quot    quot application octet-stream quot              quot  hlp quot    quot application winhlp quot              quot  hpp quot    quot text plain quot              quot  hqx quot    quot application mac-binhex40 quot              quot  hta quot    quot application hta quot              quot  htc quot    quot text x-component quot              quot  htm quot    quot text html quot              quot  html quot    quot text html quot              quot  htt quot    quot text webviewhtml quot              quot  hxa quot    quot application xml quot              quot  hxc quot    quot application xml quot              quot  hxd quot    quot application octet-stream quot              quot  hxe quot    quot application xml quot              quot  hxf quot    quot application xml quot              quot  hxh quot    quot application octet-stream quot              quot  hxi quot    quot application octet-stream quot              quot  hxk quot    quot application xml quot              quot  hxq quot    quot application octet-stream quot              quot  hxr quot    quot application octet-stream quot              quot  hxs quot    quot application octet-stream quot              quot  hxt quot    quot text html quot              quot  hxv quot    quot application xml quot              quot  hxw quot    quot application octet-stream quot              quot  hxx quot    quot text plain quot              quot  i quot    quot text plain quot              quot  ico quot    quot image x-icon quot              quot  ics quot    quot application octet-stream quot              quot  idl quot    quot text plain quot              quot  ief quot    quot image ief quot              quot  iii quot    quot application x-iphone quot              quot  inc quot    quot text plain quot              quot  inf quot    quot application octet-stream quot              quot  inl quot    quot text plain quot              quot  ins quot    quot application x-internet-signup quot              quot  ipa quot    quot application x-itunes-ipa quot              quot  ipg quot    quot application x-itunes-ipg quot              quot  ipproj quot    quot text plain quot              quot  ipsw quot    quot application x-itunes-ipsw quot              quot  iqy quot    quot text x-ms-iqy quot              quot  isp quot    quot application x-internet-signup quot              quot  ite quot    quot application x-itunes-ite quot              quot  itlp quot    quot application x-itunes-itlp quot              quot  itms quot    quot application x-itunes-itms quot              quot  itpc quot    quot application x-itunes-itpc quot              quot  IVF quot    quot video x-ivf quot              quot  jar quot    quot application java-archive quot              quot  java quot    quot application octet-stream quot              quot  jck quot    quot application liquidmotion quot              quot  jcz quot    quot application liquidmotion quot              quot  jfif quot    quot image pjpeg quot              quot  jnlp quot    quot application x-java-jnlp-file quot              quot  jpb quot    quot application octet-stream quot              quot  jpe quot    quot image jpeg quot              quot  jpeg quot    quot image jpeg quot              quot  jpg quot    quot image jpeg quot              quot  js quot    quot application x-javascript quot              quot  json quot    quot application json quot              quot  jsx quot    quot text jscript quot              quot  jsxbin quot    quot text plain quot              quot  latex quot    quot application x-latex quot              quot  library-ms quot    quot application windows-library xml quot              quot  lit quot    quot application x-ms-reader quot              quot  loadtest quot    quot application xml quot              quot  lpk quot    quot application octet-stream quot              quot  lsf quot    quot video x-la-asf quot              quot  lst quot    quot text plain quot              quot  lsx quot    quot video x-la-asf quot              quot  lzh quot    quot application octet-stream quot              quot  m13 quot    quot application x-msmediaview quot              quot  m14 quot    quot application x-msmediaview quot              quot  m1v quot    quot video mpeg quot              quot  m2t quot    quot video vnd dlna mpeg-tts quot              quot  m2ts quot    quot video vnd dlna mpeg-tts quot              quot  m2v quot    quot video mpeg quot              quot  m3u quot    quot audio x-mpegurl quot              quot  m3u8 quot    quot audio x-mpegurl quot              quot  m4a quot    quot audio m4a quot              quot  m4b quot    quot audio m4b quot              quot  m4p quot    quot audio m4p quot              quot  m4r quot    quot audio x-m4r quot              quot  m4v quot    quot video x-m4v quot              quot  mac quot    quot image x-macpaint quot              quot  mak quot    quot text plain quot              quot  man quot    quot application x-troff-man quot              quot  manifest quot    quot application x-ms-manifest quot              quot  map quot    quot text plain quot              quot  master quot    quot application xml quot              quot  mda quot    quot application msaccess quot              quot  mdb quot    quot application x-msaccess quot              quot  mde quot    quot application msaccess quot              quot  mdp quot    quot application octet-stream quot              quot  me quot    quot application x-troff-me quot              quot  mfp quot    quot application x-shockwave-flash quot              quot  mht quot    quot message rfc822 quot              quot  mhtml quot    quot message rfc822 quot              quot  mid quot    quot audio mid quot              quot  midi quot    quot audio mid quot              quot  mix quot    quot application octet-stream quot              quot  mk quot    quot text plain quot              quot  mmf quot    quot application x-smaf quot              quot  mno quot    quot text xml quot              quot  mny quot    quot application x-msmoney quot              quot  mod quot    quot video mpeg quot              quot  mov quot    quot video quicktime quot              quot  movie quot    quot video x-sgi-movie quot              quot  mp2 quot    quot video mpeg quot              quot  mp2v quot    quot video mpeg quot              quot  mp3 quot    quot audio mpeg quot              quot  mp4 quot    quot video mp4 quot              quot  mp4v quot    quot video mp4 quot              quot  mpa quot    quot video mpeg quot              quot  mpe quot    quot video mpeg quot              quot  mpeg quot    quot video mpeg quot              quot  mpf quot    quot application vnd ms-mediapackage quot              quot  mpg quot    quot video mpeg quot              quot  mpp quot    quot application vnd ms-project quot              quot  mpv2 quot    quot video mpeg quot              quot  mqv quot    quot video quicktime quot              quot  ms quot    quot application x-troff-ms quot              quot  msi quot    quot application octet-stream quot              quot  mso quot    quot application octet-stream quot              quot  mts quot    quot video vnd dlna mpeg-tts quot              quot  mtx quot    quot application xml quot              quot  mvb quot    quot application x-msmediaview quot              quot  mvc quot    quot application x-miva-compiled quot              quot  mxp quot    quot application x-mmxp quot              quot  nc quot    quot application x-netcdf quot              quot  nsc quot    quot video x-ms-asf quot              quot  nws quot    quot message rfc822 quot              quot  ocx quot    quot application octet-stream quot              quot  oda quot    quot application oda quot              quot  odc quot    quot text x-ms-odc quot              quot  odh quot    quot text plain quot              quot  odl quot    quot text plain quot              quot  odp quot    quot application vnd oasis opendocument presentation quot              quot  ods quot    quot application oleobject quot              quot  odt quot    quot application vnd oasis opendocument text quot              quot  one quot    quot application onenote quot              quot  onea quot    quot application onenote quot              quot  onepkg quot    quot application onenote quot              quot  onetmp quot    quot application onenote quot              quot  onetoc quot    quot application onenote quot              quot  onetoc2 quot    quot application onenote quot              quot  orderedtest quot    quot application xml quot              quot  osdx quot    quot application opensearchdescription xml quot              quot  p10 quot    quot application pkcs10 quot              quot  p12 quot    quot application x-pkcs12 quot              quot  p7b quot    quot application x-pkcs7-certificates quot              quot  p7c quot    quot application pkcs7-mime quot              quot  p7m quot    quot application pkcs7-mime quot              quot  p7r quot    quot application x-pkcs7-certreqresp quot              quot  p7s quot    quot application pkcs7-signature quot              quot  pbm quot    quot image x-portable-bitmap quot              quot  pcast quot    quot application x-podcast quot              quot  pct quot    quot image pict quot              quot  pcx quot    quot application octet-stream quot              quot  pcz quot    quot application octet-stream quot              quot  pdf quot    quot application pdf quot              quot  pfb quot    quot application octet-stream quot              quot  pfm quot    quot application octet-stream quot              quot  pfx quot    quot application x-pkcs12 quot              quot  pgm quot    quot image x-portable-graymap quot              quot  pic quot    quot image pict quot              quot  pict quot    quot image pict quot              quot  pkgdef quot    quot text plain quot              quot  pkgundef quot    quot text plain quot              quot  pko quot    quot application vnd ms-pki pko quot              quot  pls quot    quot audio scpls quot              quot  pma quot    quot application x-perfmon quot              quot  pmc quot    quot application x-perfmon quot              quot  pml quot    quot application x-perfmon quot              quot  pmr quot    quot application x-perfmon quot              quot  pmw quot    quot application x-perfmon quot              quot  png quot    quot image png quot              quot  pnm quot    quot image x-portable-anymap quot              quot  pnt quot    quot image x-macpaint quot              quot  pntg quot    quot image x-macpaint quot              quot  pnz quot    quot image png quot              quot  pot quot    quot application vnd ms-powerpoint quot              quot  potm quot    quot application vnd ms-powerpoint template macroEnabled 12 quot              quot  potx quot    quot application vnd openxmlformats-officedocument presentationml template quot              quot  ppa quot    quot application vnd ms-powerpoint quot              quot  ppam quot    quot application vnd ms-powerpoint addin macroEnabled 12 quot              quot  ppm quot    quot image x-portable-pixmap quot              quot  pps quot    quot application vnd ms-powerpoint quot              quot  ppsm quot    quot application vnd ms-powerpoint slideshow macroEnabled 12 quot              quot  ppsx quot    quot application vnd openxmlformats-officedocument presentationml slideshow quot              quot  ppt quot    quot application vnd ms-powerpoint quot              quot  pptm quot    quot application vnd ms-powerpoint presentation macroEnabled 12 quot              quot  pptx quot    quot application vnd openxmlformats-officedocument presentationml presentation quot              quot  prf quot    quot application pics-rules quot              quot  prm quot    quot application octet-stream quot              quot  prx quot    quot application octet-stream quot              quot  ps quot    quot application postscript quot              quot  psc1 quot    quot application PowerShell quot              quot  psd quot    quot application octet-stream quot              quot  psess quot    quot application xml quot              quot  psm quot    quot application octet-stream quot              quot  psp quot    quot application octet-stream quot              quot  pub quot    quot application x-mspublisher quot              quot  pwz quot    quot application vnd ms-powerpoint quot              quot  qht quot    quot text x-html-insertion quot              quot  qhtm quot    quot text x-html-insertion quot              quot  qt quot    quot video quicktime quot              quot  qti quot    quot image x-quicktime quot              quot  qtif quot    quot image x-quicktime quot              quot  qtl quot    quot application x-quicktimeplayer quot              quot  qxd quot    quot application octet-stream quot              quot  ra quot    quot audio x-pn-realaudio quot              quot  ram quot    quot audio x-pn-realaudio quot              quot  rar quot    quot application octet-stream quot              quot  ras quot    quot image x-cmu-raster quot              quot  rat quot    quot application rat-file quot              quot  rc quot    quot text plain quot              quot  rc2 quot    quot text plain quot              quot  rct quot    quot text plain quot              quot  rdlc quot    quot application xml quot              quot  resx quot    quot application xml quot              quot  rf quot    quot image vnd rn-realflash quot              quot  rgb quot    quot image x-rgb quot              quot  rgs quot    quot text plain quot              quot  rm quot    quot application vnd rn-realmedia quot              quot  rmi quot    quot audio mid quot              quot  rmp quot    quot application vnd rn-rn music package quot              quot  roff quot    quot application x-troff quot              quot  rpm quot    quot audio x-pn-realaudio-plugin quot              quot  rqy quot    quot text x-ms-rqy quot              quot  rtf quot    quot application rtf quot              quot  rtx quot    quot text richtext quot              quot  ruleset quot    quot application xml quot              quot  s quot    quot text plain quot              quot  safariextz quot    quot application x-safari-safariextz quot              quot  scd quot    quot application x-msschedule quot              quot  sct quot    quot text scriptlet quot              quot  sd2 quot    quot audio x-sd2 quot              quot  sdp quot    quot application sdp quot              quot  sea quot    quot application octet-stream quot              quot  searchConnector-ms quot    quot application windows-search-connector xml quot              quot  setpay quot    quot application set-payment-initiation quot              quot  setreg quot    quot application set-registration-initiation quot              quot  settings quot    quot application xml quot              quot  sgimb quot    quot application x-sgimb quot              quot  sgml quot    quot text sgml quot              quot  sh quot    quot application x-sh quot              quot  shar quot    quot application x-shar quot              quot  shtml quot    quot text html quot              quot  sit quot    quot application x-stuffit quot              quot  sitemap quot    quot application xml quot              quot  skin quot    quot application xml quot              quot  sldm quot    quot application vnd ms-powerpoint slide macroEnabled 12 quot              quot  sldx quot    quot application vnd openxmlformats-officedocument presentationml slide quot              quot  slk quot    quot application vnd ms-excel quot              quot  sln quot    quot text plain quot              quot  slupkg-ms quot    quot application x-ms-license quot              quot  smd quot    quot audio x-smd quot              quot  smi quot    quot application octet-stream quot              quot  smx quot    quot audio x-smd quot              quot  smz quot    quot audio x-smd quot              quot  snd quot    quot audio basic quot              quot  snippet quot    quot application xml quot              quot  snp quot    quot application octet-stream quot              quot  sol quot    quot text plain quot              quot  sor quot    quot text plain quot              quot  spc quot    quot application x-pkcs7-certificates quot              quot  spl quot    quot application futuresplash quot              quot  src quot    quot application x-wais-source quot              quot  srf quot    quot text plain quot              quot  SSISDeploymentManifest quot    quot text xml quot              quot  ssm quot    quot application streamingmedia quot              quot  sst quot    quot application vnd ms-pki certstore quot              quot  stl quot    quot application vnd ms-pki stl quot              quot  sv4cpio quot    quot application x-sv4cpio quot              quot  sv4crc quot    quot application x-sv4crc quot              quot  svc quot    quot application xml quot              quot  swf quot    quot application x-shockwave-flash quot              quot  t quot    quot application x-troff quot              quot  tar quot    quot application x-tar quot              quot  tcl quot    quot application x-tcl quot              quot  testrunconfig quot    quot application xml quot              quot  testsettings quot    quot application xml quot              quot  tex quot    quot application x-tex quot              quot  texi quot    quot application x-texinfo quot              quot  texinfo quot    quot application x-texinfo quot              quot  tgz quot    quot application x-compressed quot              quot  thmx quot    quot application vnd ms-officetheme quot              quot  thn quot    quot application octet-stream quot              quot  tif quot    quot image tiff quot              quot  tiff quot    quot image tiff quot              quot  tlh quot    quot text plain quot              quot  tli quot    quot text plain quot              quot  toc quot    quot application octet-stream quot              quot  tr quot    quot application x-troff quot              quot  trm quot    quot application x-msterminal quot              quot  trx quot    quot application xml quot              quot  ts quot    quot video vnd dlna mpeg-tts quot              quot  tsv quot    quot text tab-separated-values quot              quot  ttf quot    quot application octet-stream quot              quot  tts quot    quot video vnd dlna mpeg-tts quot              quot  txt quot    quot text plain quot              quot  u32 quot    quot application octet-stream quot              quot  uls quot    quot text iuls quot              quot  user quot    quot text plain quot              quot  ustar quot    quot application x-ustar quot              quot  vb quot    quot text plain quot              quot  vbdproj quot    quot text plain quot              quot  vbk quot    quot video mpeg quot              quot  vbproj quot    quot text plain quot              quot  vbs quot    quot text vbscript quot              quot  vcf quot    quot text x-vcard quot              quot  vcproj quot    quot Application xml quot              quot  vcs quot    quot text plain quot              quot  vcxproj quot    quot Application xml quot              quot  vddproj quot    quot text plain quot              quot  vdp quot    quot text plain quot              quot  vdproj quot    quot text plain quot              quot  vdx quot    quot application vnd ms-visio viewer quot              quot  vml quot    quot text xml quot              quot  vscontent quot    quot application xml quot              quot  vsct quot    quot text xml quot              quot  vsd quot    quot application vnd visio quot              quot  vsi quot    quot application ms-vsi quot              quot  vsix quot    quot application vsix quot              quot  vsixlangpack quot    quot text xml quot              quot  vsixmanifest quot    quot text xml quot              quot  vsmdi quot    quot application xml quot              quot  vspscc quot    quot text plain quot              quot  vss quot    quot application vnd visio quot              quot  vsscc quot    quot text plain quot              quot  vssettings quot    quot text xml quot              quot  vssscc quot    quot text plain quot              quot  vst quot    quot application vnd visio quot              quot  vstemplate quot    quot text xml quot              quot  vsto quot    quot application x-ms-vsto quot              quot  vsw quot    quot application vnd visio quot              quot  vsx quot    quot application vnd visio quot              quot  vtx quot    quot application vnd visio quot              quot  wav quot    quot audio wav quot              quot  wave quot    quot audio wav quot              quot  wax quot    quot audio x-ms-wax quot              quot  wbk quot    quot application msword quot              quot  wbmp quot    quot image vnd wap wbmp quot              quot  wcm quot    quot application vnd ms-works quot              quot  wdb quot    quot application vnd ms-works quot              quot  wdp quot    quot image vnd ms-photo quot              quot  webarchive quot    quot application x-safari-webarchive quot              quot  webtest quot    quot application xml quot              quot  wiq quot    quot application xml quot              quot  wiz quot    quot application msword quot              quot  wks quot    quot application vnd ms-works quot              quot  WLMP quot    quot application wlmoviemaker quot              quot  wlpginstall quot    quot application x-wlpg-detect quot              quot  wlpginstall3 quot    quot application x-wlpg3-detect quot              quot  wm quot    quot video x-ms-wm quot              quot  wma quot    quot audio x-ms-wma quot              quot  wmd quot    quot application x-ms-wmd quot              quot  wmf quot    quot application x-msmetafile quot              quot  wml quot    quot text vnd wap wml quot              quot  wmlc quot    quot application vnd wap wmlc quot              quot  wmls quot    quot text vnd wap wmlscript quot              quot  wmlsc quot    quot application vnd wap wmlscriptc quot              quot  wmp quot    quot video x-ms-wmp quot              quot  wmv quot    quot video x-ms-wmv quot              quot  wmx quot    quot video x-ms-wmx quot              quot  wmz quot    quot application x-ms-w

User · Answer

You should not trust the file extension coming from client. Always check the file's magic number.

Using FileTpeInterrogator with ASP.NET Core:

public static class FileTypeChecker
{
    private static List<string> validVideoMimeTypes = new List<string> { "video/mp4", "video/quicktime" };
    private static List<string> validImageMimeTypes = new List<string> { "image/png", "image/jpeg" };

    public static bool IsValidVideo(IFormFile file)
    {
        return validVideoMimeTypes.Contains(GetFileMimeType(file));
    }

    public static bool IsValidImage(IFormFile file)
    {
        return validImageMimeTypes.Contains(GetFileMimeType(file));
    }

    private static string GetFileMimeType(IFormFile file)
    {
        // You should have checked for null and file length before reaching here

        IFileTypeInterrogator interrogator = new FileTypeInterrogator.FileTypeInterrogator();

        byte[] fileBytes;
        using (var stream = new MemoryStream())
        {
            file.CopyTo(stream);
            fileBytes = stream.ToArray();
        }

        FileTypeInfo fileTypeInfo = interrogator.DetectType(fileBytes);
        return fileTypeInfo.MimeType.ToLower();
    }
}

Inside your controller or service:

public IActionResult UploadVideo([FromForm] UploadVideoVM model)
{
    if (model.File.Length < minimumLength || model.File.Length > maximumLength)
    {
        // BadRequest => Size
    }
    else if (!FileTypeChecker.IsValidVideo(model.File))
    {
        // BadRequest => Type
    }
    else
    {
        // All good
    }

    return Ok();
}

To get MIME type of a file extension refer to this file.

User · Answer

For ASP NET or other  The options were changed a bit in ASP NET Core  here they are  credits     new FileExtensionContentTypeProvider   TryGetContentType fileName  out contentType    vNext only    Never tested  but looks like you can officially expand the mime types list via the exposed Mappings property   Use the MimeTypes NuGet package Copy the MimeMappings file from the reference source of the  NET Framework   For  NET Framework    4 5   Use the System Web MimeMapping GetMimeMapping method  that is part of the BCL in  NET Framework 4 5   string mimeType   MimeMapping GetMimeMapping fileName     If you need to add custom mappings you probably can use reflection to add mappings to the BCL MimeMapping class  it uses a custom dictionary that exposes this method  so you should invoke the following to add mappings  never tested tho  but should prob  work    Anyway  when using reflection to add MIME types  be aware that since you re accessing a private field  its name might change or even be totally removed  so you should be extra cautious and add double checks and provide fail safe action for every step   MimeMapping  mappingDictionary AddMapping string fileExtension  string mimeType

User · Answer

Bryan Denny s post above is not working for me since not all extensions have a  Content Type  sub-key in the registry  I had to tweak the code as follows   private string GetMimeType string sFileName         Get file extension and if it is empty  return unknown   string sExt   Path GetExtension sFileName     if  string IsNullOrEmpty sExt   return  Unknown file type         Default type is  EXT File    string mimeType   string Format   0  File   sExt ToUpper   Replace                  Open the registry key for the extension under HKEY CLASSES ROOT and return default if it doesn t exist   Microsoft Win32 RegistryKey regKey   Microsoft Win32 Registry ClassesRoot OpenSubKey sExt     if  regKey    null  return mimeType        Get the   Default   value and re-open the key for that value   string sSubType   regKey GetValue     ToString      regKey   Microsoft Win32 Registry ClassesRoot OpenSubKey sSubType         If it exists  get the   Default   value of the new key   if  regKey  GetValue        null  mimeType   regKey GetValue     ToString          Return the value   return mimeType      Now it works fine for me for all registered file types and un-registered or generic file types  like JPG  etc

User · Answer

FileExtension handle the file extension and not the Mime  The user can change the file extension  so check the Mime  The codes examples associate Mime by file extension  this is wrong and does not work   Need to get the contenttype file and check if the table Mime contetType this file according to the file extension  Now  how to get the ContentType of the file   Using FileUpload is thus  FileUpload PostedFile ContentType  Now if I already have the file  as caught your ContentType

[c#] Get MIME type from filename extension

The answer is

For ASP.NET or other

For .NET Framework >= 4.5:

Examples related to c#

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