Given a filesystem path is there a shorter way to extract the filename without its extension

Question

I program in WPF C    I have e g  the following path   C  Program Files hello txt   and I want to extract hello from it    The path is a string retrieved from a database   Currently I m using the following code to split the path by     and then split again by       string path    C   Program Files  hello txt   string   pathArr   path Split        string   fileArr   pathArr Last   Split       string fileName   fileArr Last   ToString      It works  but I believe there should be shorter and smarter solution to that  Any idea

User · Accepted Answer

Path GetFileName  Path GetFileNameWithoutExtension  The Path class is wonderful

User · Answer

Try this   string fileName   Path GetFileNameWithoutExtension   C  Program Files hello txt      This will return  hello  for fileName

User · Answer

try  System IO Path GetFileNameWithoutExtension path      demo  string fileName     C  mydir myfile ext   string path     C  mydir    string result   result   Path GetFileNameWithoutExtension fileName   Console WriteLine  GetFileNameWithoutExtension   0    returns   1          fileName  result    result   Path GetFileName path   Console WriteLine  GetFileName   0    returns   1          path  result       This code produces output similar to the following        GetFileNameWithoutExtension  C  mydir myfile ext   returns  myfile     GetFileName  C  mydir    returns      https   msdn microsoft com en-gb library system io path getfilenamewithoutextension 28v vs 80 29 aspx

User · Answer

You can use Path API as follow    var filenNme   Path GetFileNameWithoutExtension  File Path      More info  Path GetFileNameWithoutExtension

User · Answer

Try this   string FilePath   C  mydir myfile ext   string Result Path GetFileName FilePath    With Extension string Result Path GetFileNameWithoutExtension FilePath    Without Extension

User · Answer

string Location    C   Program Files  hello txt    string FileName   Location Substring Location LastIndexOf             1

User · Answer

Firstly  the code in the question does not produce the described output   It extracts the file extension   quot txt quot   and not the file base name   quot hello quot     To do that the last line should call First    not Last    like this    static string GetFileBaseNameUsingSplit string path        string   pathArr   path Split            string   fileArr   pathArr Last   Split           string fileBaseName   fileArr First   ToString         return fileBaseName     Having made that change  one thing to think about as far as improving this code is the amount of garbage it creates   A string   containing one string for each path segment in path A string   containing at least one string for each   in the last path segment in path  Therefore  extracting the base file name from the sample path  quot C  Program Files hello txt quot  should produce the  temporary  objects  quot C  quot    quot Program Files quot    quot hello txt quot    quot hello quot    quot txt quot   a string 3   and a string 2    This could be significant if the method is called on a large number of paths   To improve this  we can search path ourselves to locate the start and end points of the base name and use those to create one new string    static string GetFileBaseNameUsingSubstringUnsafe string path           Fails on paths with no file extension - DO NOT USE       int startIndex   path LastIndexOf         1      int endIndex   path IndexOf      startIndex       string fileBaseName   path Substring startIndex  endIndex - startIndex        return fileBaseName     This is using the index of the character after the last   as the start of the base name  and from there looking for the first   to use as the index of the character after the end of the base name   Is this shorter than the original code   Not quite   Is it a  quot smarter quot  solution   I think so   At least  it would be if not for the fact that    As you can see from the comment  the previous method is problematic   Though it works if you assume all paths end with a file name with an extension  it will throw an exception if the path ends with    i e  a directory path  or otherwise contains no extension in the last segment   To fix this  we need to add an extra check to account for when endIndex is -1  i e    is not found     static string GetFileBaseNameUsingSubstring string path        int startIndex   path LastIndexOf         1      int endIndex   path IndexOf      startIndex       int length    endIndex  gt   0   endIndex   path Length  - startIndex      string fileBaseName   path Substring startIndex  length        return fileBaseName     Now this version is nowhere near shorter than the original  but it is more efficient and  now  correct  too  As far as  NET methods that implement this functionality  many other answers suggest using Path GetFileNameWithoutExtension    which is an obvious  easy solution but does not produce the same results as the code in the question   There is a subtle but important difference between GetFileBaseNameUsingSplit   and Path GetFileNameWithoutExtension    GetFileBaseNameUsingPath   below   the former extracts everything before the first   and the latter extracts everything before the last     This doesn t make a difference for the sample path in the question  but take a look at this table comparing the results of the above four methods when called with various paths        Description Method Path Result     Single extension GetFileBaseNameUsingSplit    quot C  Program Files hello txt quot   quot hello quot    Single extension GetFileBaseNameUsingPath    quot C  Program Files hello txt quot   quot hello quot    Single extension GetFileBaseNameUsingSubstringUnsafe    quot C  Program Files hello txt quot   quot hello quot    Single extension GetFileBaseNameUsingSubstring    quot C  Program Files hello txt quot   quot hello quot          Double extension GetFileBaseNameUsingSplit    quot C  Program Files hello txt ext quot   quot hello quot    Double extension GetFileBaseNameUsingPath    quot C  Program Files hello txt ext quot   quot hello txt quot    Double extension GetFileBaseNameUsingSubstringUnsafe    quot C  Program Files hello txt ext quot   quot hello quot    Double extension GetFileBaseNameUsingSubstring    quot C  Program Files hello txt ext quot   quot hello quot          No extension GetFileBaseNameUsingSplit    quot C  Program Files hello quot   quot hello quot    No extension GetFileBaseNameUsingPath    quot C  Program Files hello quot   quot hello quot    No extension GetFileBaseNameUsingSubstringUnsafe    quot C  Program Files hello quot  EXCEPTION  Length cannot be less than zero   Parameter  length     No extension GetFileBaseNameUsingSubstring    quot C  Program Files hello quot   quot hello quot          Leading period GetFileBaseNameUsingSplit    quot C  Program Files  hello txt quot   quot  quot    Leading period GetFileBaseNameUsingPath    quot C  Program Files  hello txt quot   quot  hello quot    Leading period GetFileBaseNameUsingSubstringUnsafe    quot C  Program Files  hello txt quot   quot  quot    Leading period GetFileBaseNameUsingSubstring    quot C  Program Files  hello txt quot   quot  quot          Trailing period GetFileBaseNameUsingSplit    quot C  Program Files hello txt  quot   quot hello quot    Trailing period GetFileBaseNameUsingPath    quot C  Program Files hello txt  quot   quot hello txt quot    Trailing period GetFileBaseNameUsingSubstringUnsafe    quot C  Program Files hello txt  quot   quot hello quot    Trailing period GetFileBaseNameUsingSubstring    quot C  Program Files hello txt  quot   quot hello quot          Directory path GetFileBaseNameUsingSplit    quot C  Program Files  quot   quot  quot    Directory path GetFileBaseNameUsingPath    quot C  Program Files  quot   quot  quot    Directory path GetFileBaseNameUsingSubstringUnsafe    quot C  Program Files  quot  EXCEPTION  Length cannot be less than zero   Parameter  length     Directory path GetFileBaseNameUsingSubstring    quot C  Program Files  quot   quot  quot          Current file path GetFileBaseNameUsingSplit    quot hello txt quot   quot hello quot    Current file path GetFileBaseNameUsingPath    quot hello txt quot   quot hello quot    Current file path GetFileBaseNameUsingSubstringUnsafe    quot hello txt quot   quot hello quot    Current file path GetFileBaseNameUsingSubstring    quot hello txt quot   quot hello quot          Parent file path GetFileBaseNameUsingSplit    quot    hello txt quot   quot hello quot    Parent file path GetFileBaseNameUsingPath    quot    hello txt quot   quot hello quot    Parent file path GetFileBaseNameUsingSubstringUnsafe    quot    hello txt quot   quot hello quot    Parent file path GetFileBaseNameUsingSubstring    quot    hello txt quot   quot hello quot          Parent directory path GetFileBaseNameUsingSplit    quot    quot   quot  quot    Parent directory path GetFileBaseNameUsingPath    quot    quot   quot   quot    Parent directory path GetFileBaseNameUsingSubstringUnsafe    quot    quot   quot  quot    Parent directory path GetFileBaseNameUsingSubstring    quot    quot   quot  quot         and you ll see that Path GetFileNameWithoutExtension   yields different results when passed a path where the file name has a double extension or a leading and or trailing     You can try it for yourself with the following code    using System  using System IO  using System Linq  using System Reflection   namespace SO6921105       internal class PathExtractionResult               public string Description   get  set            public string Method   get  set            public string Path   get  set            public string Result   get  set               public static class Program               private static string GetFileBaseNameUsingSplit string path                        string   pathArr   path Split                    string   fileArr   pathArr Last   Split                   string fileBaseName   fileArr First   ToString                 return fileBaseName                     private static string GetFileBaseNameUsingPath string path                        return Path GetFileNameWithoutExtension path                      private static string GetFileBaseNameUsingSubstringUnsafe string path                           Fails on paths with no file extension - DO NOT USE               int startIndex   path LastIndexOf         1              int endIndex   path IndexOf      startIndex               string fileBaseName   path Substring startIndex  endIndex - startIndex                return fileBaseName                     private static string GetFileBaseNameUsingSubstring string path                        int startIndex   path LastIndexOf         1              int endIndex   path IndexOf      startIndex               int length    endIndex  gt   0   endIndex   path Length  - startIndex              string fileBaseName   path Substring startIndex  length                return fileBaseName                     public static void Main                         MethodInfo   testMethods   typeof Program  GetMethods BindingFlags NonPublic   BindingFlags Static                   Where method   gt  method Name StartsWith  quot GetFileBaseName quot                     ToArray                var inputs   new                     new   Description    quot Single extension quot        Path     quot C  Program Files hello txt quot                         new   Description    quot Double extension quot        Path     quot C  Program Files hello txt ext quot                     new   Description    quot No extension quot            Path     quot C  Program Files hello quot                             new   Description    quot Leading period quot          Path     quot C  Program Files  hello txt quot                        new   Description    quot Trailing period quot         Path     quot C  Program Files hello txt  quot                        new   Description    quot Directory path quot          Path     quot C  Program Files  quot                                  new   Description    quot Current file path quot       Path    quot hello txt quot                                           new   Description    quot Parent file path quot        Path     quot    hello txt quot                                       new   Description    quot Parent directory path quot   Path    quot    quot                                                            PathExtractionResult   results   inputs                  SelectMany                      input   gt  testMethods Select                          method   gt                                string result                               try                                                               string returnValue    string  method Invoke null  new object     input Path                                      result     quot   quot  returnValue   quot  quot                                                             catch  Exception ex                                                                if  ex is TargetInvocationException                                      ex   ex InnerException                                  result     quot EXCEPTION   ex Message  quot                                                              return new PathExtractionResult                                     Description   input Description                                  Method     quot  method Name    quot                                   Path     quot   quot  input Path   quot  quot                                   Result   result                                                                                                  ToArray                const int ColumnPadding   2              ResultWriter writer   new ResultWriter Console Out                    DescriptionColumnWidth   results Max output   gt  output Description Length    ColumnPadding                  MethodColumnWidth   results Max output   gt  output Method Length    ColumnPadding                  PathColumnWidth   results Max output   gt  output Path Length    ColumnPadding                  ResultColumnWidth   results Max output   gt  output Result Length    ColumnPadding                  ItemLeftPadding    quot   quot                   ItemRightPadding    quot   quot                             PathExtractionResult header   new PathExtractionResult                     Description   nameof PathExtractionResult Description                   Method   nameof PathExtractionResult Method                   Path   nameof PathExtractionResult Path                   Result   nameof PathExtractionResult Result                              writer WriteResult header               writer WriteDivider                foreach  IGrouping lt string  PathExtractionResult gt  resultGroup in results GroupBy result   gt  result Description                                 foreach  PathExtractionResult result in resultGroup                      writer WriteResult result                   writer WriteDivider                                       internal class ResultWriter               private const char DividerChar    -           private const char SeparatorChar                 private TextWriter Writer   get             public ResultWriter TextWriter writer                        Writer   writer    throw new ArgumentNullException nameof writer                       public int DescriptionColumnWidth   get  set             public int MethodColumnWidth   get  set             public int PathColumnWidth   get  set             public int ResultColumnWidth   get  set             public string ItemLeftPadding   get  set             public string ItemRightPadding   get  set             public void WriteResult PathExtractionResult result                        WriteLine                    quot  ItemLeftPadding  result Description  ItemRightPadding  quot                     quot  ItemLeftPadding  result Method  ItemRightPadding  quot                     quot  ItemLeftPadding  result Path  ItemRightPadding  quot                     quot  ItemLeftPadding  result Result  ItemRightPadding  quot                                    public void WriteDivider                         WriteLine                  new string DividerChar  DescriptionColumnWidth                   new string DividerChar  MethodColumnWidth                   new string DividerChar  PathColumnWidth                   new string DividerChar  ResultColumnWidth                                    private void WriteLine string description  string method  string path  string result                        Writer Write SeparatorChar               Writer Write description PadRight DescriptionColumnWidth                Writer Write SeparatorChar               Writer Write method PadRight MethodColumnWidth                Writer Write SeparatorChar               Writer Write path PadRight PathColumnWidth                Writer Write SeparatorChar               Writer Write result PadRight ResultColumnWidth                Writer WriteLine SeparatorChar                      TL DR The code in the question does not behave as many seem to expect in some corner cases   If you re going to write your own path manipulation code  be sure to take into consideration        how you define a  quot filename without extension quot   is it everything before the first   or everything before the last        files with multiple extensions    files with no extension    files with a leading      files with a trailing    probably not something you ll ever encounter on Windows  but they are possible     directories with an  quot extension quot  or that otherwise contain a      paths that end with a      relative paths  Not all file paths follow the usual formula of X  Directory File ext

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string filepath    C   Program Files  example txt   FileVersionInfo myFileVersionInfo   FileVersionInfo GetVersionInfo filepath   FileInfo fi   new FileInfo filepath   Console WriteLine fi Name      input to the  fi  is a full path to the file from  filepath    This code will return the fileName from the given path    output   example txt

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try  fileName   Path GetFileName  path     http   msdn microsoft com de-de library system io path getfilename aspx

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var fileNameWithoutExtension   Path GetFileNameWithoutExtension path     Path GetFileNameWithoutExtension

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Namespace  using System IO       use this to get file name dynamically   string filelocation   Properties Settings Default Filelocation    use this to get file name statically    string filelocation     D  FileDirectory    string   filesname   Directory GetFiles filelocation     for multiple files  Your path configuration in App config file if you are going to get file name dynamically  -       lt userSettings gt           lt ConsoleApplication13 Properties Settings gt             lt setting name  Filelocation  serializeAs  String  gt               lt value gt D   DeleteFileTest lt  value gt             lt  setting gt                 lt  ConsoleApplication13 Properties Settings gt         lt  userSettings gt

[c#] Given a filesystem path, is there a shorter way to extract the filename without its extension?

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