Creating a ZIP archive in memory using System IO Compression

Question

I m trying to create a ZIP archive with a simple demo text file using a MemoryStream as follows   using  var memoryStream   new MemoryStream    using  var archive   new ZipArchive memoryStream   ZipArchiveMode Create         var demoFile   archive CreateEntry  foo txt         using  var entryStream   demoFile Open        using  var streamWriter   new StreamWriter entryStream                 streamWriter Write  Bar                using  var fileStream   new FileStream   C  Temp test zip   FileMode Create                 stream CopyTo fileStream             If I run this code  the archive file itself is created but foo txt isn t   However  if I replace the MemoryStream directly with the file stream  the archive is created correctly   using  var fileStream   new FileStream   C  Temp test zip   FileMode Create   using  var archive   new ZipArchive fileStream  FileMode Create                    Is it possible to use a MemoryStream to create the ZIP archive without the FileStream

User · Answer

using System  using System IO  using System IO Compression   namespace ConsoleApplication       class Program enter code here                static void Main string   args                        using  FileStream zipToOpen   new FileStream   c  users exampleuser release zip   FileMode Open                                 using  ZipArchive archive   new ZipArchive zipToOpen  ZipArchiveMode Update                                         ZipArchiveEntry readmeEntry   archive CreateEntry  Readme txt                        using  StreamWriter writer   new StreamWriter readmeEntry Open                                                       writer WriteLine  Information about this package                                 writer WriteLine

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Just in case  if anyone wants to save a dynamic zip file through SaveFileDialog          var logFileName    quot zip filename zip quot           appLogSaver FileName   logFileName          appLogSaver Filter    quot LogFiles   zip quot           appLogSaver DefaultExt    quot zip quot           DialogResult resDialog   appLogSaver ShowDialog             if  resDialog ToString       quot OK quot                         System IO FileStream fs    System IO FileStream appLogSaver OpenFile                 using  var memoryStream   new MemoryStream                                  using  var archive   new ZipArchive memoryStream  ZipArchiveMode Create  true                                         var demoFile   archive CreateEntry  quot foo txt quot                        using  var entryStream   demoFile Open                                                  using  var streamWriter   new StreamWriter entryStream                                                           read your existing file and put the content here                              streamWriter Write  quot Bar  quot                                                                         var demoFile2   archive CreateEntry  quot foo2 txt quot                        using  var entryStream   demoFile2 Open                                                  using  var streamWriter   new StreamWriter entryStream                                                         streamWriter Write  quot Bar2  quot                                                                                       memoryStream Seek 0  SeekOrigin Begin                   memoryStream CopyTo fs                             fs Close

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Just another version of zipping without writing any file   string fileName    export     DateTime Now ToString  yyyyMMddhhmmss       xlsx   byte   fileBytes   here is your file in bytes byte   compressedBytes  string fileNameZip    Export     DateTime Now ToString  yyyyMMddhhmmss       zip    using  var outStream   new MemoryStream          using  var archive   new ZipArchive outStream  ZipArchiveMode Create  true                 var fileInArchive   archive CreateEntry fileName  CompressionLevel Optimal           using  var entryStream   fileInArchive Open            using  var fileToCompressStream   new MemoryStream fileBytes                         fileToCompressStream CopyTo entryStream                       compressedBytes   outStream ToArray

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You need to finish writing the memory stream then read the buffer back           using  var memoryStream   new MemoryStream                          using  var archive   new ZipArchive memoryStream  ZipArchiveMode Create                                 var demoFile   archive CreateEntry  foo txt                     using  var entryStream   demoFile Open                    using  var streamWriter   new StreamWriter entryStream                                         streamWriter Write  Bar                                                  using  var fileStream   new FileStream   C  Temp test zip   FileMode Create                                 var bytes   memoryStream GetBuffer                    fileStream Write bytes 0 bytes Length

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Function to return stream that contain zip file  public static Stream ZipGenerator List lt string gt  files                ZipArchiveEntry fileInArchive          Stream entryStream          int i   0          List lt byte   gt  byteArray   new List lt byte   gt              foreach  var file in files                        byteArray Add File ReadAllBytes file                       var outStream   new MemoryStream             using  var archive   new ZipArchive outStream  ZipArchiveMode Create  true                         foreach  var file in files                                fileInArchive  archive CreateEntry Path GetFileName file   CompressionLevel Optimal                     using  entryStream   fileInArchive Open                                              using  var fileToCompressStream   new MemoryStream byteArray i                                                          fileToCompressStream CopyTo entryStream                                                     i                                                      outStream Position   0          return outStream          If you want   write zip to file stream   using  var fileStream   new FileStream   D  Tools DBExtractor DBExtractor bin Debug test zip   FileMode Create        outStream Position   0     outStream WriteTo fileStream

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private void button6 Click object sender  EventArgs e                   create With Input FileNames         AddFileToArchive InputByte new ZipItem    new ZipItem    E  b 1 jpg    images 1 jpg                new ZipItem   E  b 2 txt    text 2 txt       C  test zip               create with input stream         AddFileToArchive InputByte new ZipItem    new ZipItem File ReadAllBytes    E  b 1 jpg     images 1 jpg                new ZipItem File ReadAllBytes   E  b 2 txt     text 2 txt       C  test zip               Create Archive And Return StreamZipFile         MemoryStream GetStreamZipFile   AddFileToArchive new ZipItem    new ZipItem    E  b 1 jpg    images 1 jpg                new ZipItem   E  b 2 txt    text 2 txt                  Extract in memory         ZipItem   ListitemsWithBytes   ExtractItems   C  test zip               Choese Files For Extract To memory         List lt string gt  ListFileNameForExtract   new List lt string gt  new string       images 1 jpg     text 2 txt              ListitemsWithBytes   ExtractItems   C  test zip   ListFileNameForExtract                Choese Files For Extract To Directory         ExtractItems   C  test zip   ListFileNameForExtract   c   extractFiles                public struct ZipItem               string  FileNameSource          string  PathinArchive          byte    Bytes          public ZipItem string   FileNameSource  string   PathinArchive                         Bytes null                FileNameSource     FileNameSource               PathinArchive     PathinArchive                    public ZipItem byte     Bytes  string   PathinArchive                         Bytes     Bytes               FileNameSource                    PathinArchive     PathinArchive                     public string FileNameSource                       set                               FileNameSource   value                            get                               return  FileNameSource                                  public string PathinArchive                       set                                PathinArchive   value                            get                               return  PathinArchive                                  public byte   Bytes                       set                                Bytes   value                            get                               return  Bytes                                       public void AddFileToArchive ZipItem   ZipItems  string SeveToFile                 MemoryStream memoryStream   new MemoryStream               Create Empty Archive         ZipArchive archive   new ZipArchive memoryStream  ZipArchiveMode Create  true            foreach  ZipItem item in ZipItems                           Create Path File in Archive             ZipArchiveEntry FileInArchive   archive CreateEntry item PathinArchive                   Open File in Archive For Write             var OpenFileInArchive   FileInArchive Open                   Read Stream             FileStream fsReader   new FileStream item FileNameSource  FileMode Open  FileAccess Read                byte   ReadAllbytes   new byte 4096    Capcity buffer             int ReadByte   0              while  fsReader Position    fsReader Length                                  Read Bytes                 ReadByte   fsReader Read ReadAllbytes  0  ReadAllbytes Length                      Write Bytes                 OpenFileInArchive Write ReadAllbytes  0  ReadByte                             fsReader Dispose                OpenFileInArchive Close                        archive Dispose             using  var fileStream   new FileStream SeveToFile  FileMode Create                         memoryStream Seek 0  SeekOrigin Begin               memoryStream CopyTo fileStream                             public MemoryStream  AddFileToArchive ZipItem   ZipItems                 MemoryStream memoryStream   new MemoryStream               Create Empty Archive         ZipArchive archive   new ZipArchive memoryStream  ZipArchiveMode Create  true            foreach  ZipItem item in ZipItems                           Create Path File in Archive             ZipArchiveEntry FileInArchive   archive CreateEntry item PathinArchive                   Open File in Archive For Write             var OpenFileInArchive   FileInArchive Open                   Read Stream             FileStream fsReader   new FileStream item FileNameSource  FileMode Open  FileAccess Read                byte   ReadAllbytes   new byte 4096    Capcity buffer             int ReadByte   0              while  fsReader Position    fsReader Length                                  Read Bytes                 ReadByte   fsReader Read ReadAllbytes  0  ReadAllbytes Length                      Write Bytes                 OpenFileInArchive Write ReadAllbytes  0  ReadByte                             fsReader Dispose                OpenFileInArchive Close                        archive Dispose                return memoryStream                public void AddFileToArchive InputByte ZipItem   ZipItems  string SeveToFile                 MemoryStream memoryStream   new MemoryStream               Create Empty Archive         ZipArchive archive   new ZipArchive memoryStream  ZipArchiveMode Create  true            foreach  ZipItem item in ZipItems                           Create Path File in Archive             ZipArchiveEntry FileInArchive   archive CreateEntry item PathinArchive                   Open File in Archive For Write             var OpenFileInArchive   FileInArchive Open                   Read Stream               FileStream fsReader   new FileStream item FileNameSource  FileMode Open  FileAccess Read                byte   ReadAllbytes   new byte 4096    Capcity buffer             int ReadByte   4096  int  TotalWrite 0              while  TotalWrite    item Bytes Length                                 if TotalWrite 4096 gt item Bytes Length                   ReadByte item Bytes Length-TotalWrite                     Array Copy item Bytes  TotalWrite  ReadAllbytes  0  ReadByte                         Write Bytes                 OpenFileInArchive Write ReadAllbytes  0  ReadByte                   TotalWrite    ReadByte                             OpenFileInArchive Close                        archive Dispose             using  var fileStream   new FileStream SeveToFile  FileMode Create                         memoryStream Seek 0  SeekOrigin Begin               memoryStream CopyTo fileStream                          public MemoryStream  AddFileToArchive InputByte ZipItem   ZipItems                 MemoryStream memoryStream   new MemoryStream               Create Empty Archive         ZipArchive archive   new ZipArchive memoryStream  ZipArchiveMode Create  true            foreach  ZipItem item in ZipItems                           Create Path File in Archive             ZipArchiveEntry FileInArchive   archive CreateEntry item PathinArchive                   Open File in Archive For Write             var OpenFileInArchive   FileInArchive Open                   Read Stream               FileStream fsReader   new FileStream item FileNameSource  FileMode Open  FileAccess Read                byte   ReadAllbytes   new byte 4096    Capcity buffer             int ReadByte   4096  int  TotalWrite 0              while  TotalWrite    item Bytes Length                                 if TotalWrite 4096 gt item Bytes Length                   ReadByte item Bytes Length-TotalWrite                     Array Copy item Bytes  TotalWrite  ReadAllbytes  0  ReadByte                         Write Bytes                 OpenFileInArchive Write ReadAllbytes  0  ReadByte                   TotalWrite    ReadByte                             OpenFileInArchive Close                        archive Dispose               return memoryStream              public void ExtractToDirectory string sourceArchiveFileName  string destinationDirectoryName                    Opens the zip file up to be read          using  ZipArchive archive   ZipFile OpenRead sourceArchiveFileName                           if  Directory Exists destinationDirectoryName   false                    Directory CreateDirectory destinationDirectoryName                   Loops through each file in the zip file              archive ExtractToDirectory destinationDirectoryName                             public void   ExtractItems string sourceArchiveFileName List lt  string gt   PathFilesinArchive  string destinationDirectoryName                     Opens the zip file up to be read          using  ZipArchive archive   ZipFile OpenRead sourceArchiveFileName                               Loops through each file in the zip file              foreach  ZipArchiveEntry file in archive Entries                                  int PosResult    PathFilesinArchive IndexOf file FullName                    if  PosResult    -1                                            Create Folder                      if  Directory Exists  destinationDirectoryName         Path GetDirectoryName   PathFilesinArchive PosResult       false                           Directory CreateDirectory destinationDirectoryName          Path GetDirectoryName  PathFilesinArchive PosResult                           Stream OpenFileGetBytes   file Open                          FileStream   FileStreamOutput   new FileStream destinationDirectoryName           PathFilesinArchive PosResult   FileMode Create                         byte   ReadAllbytes   new byte 4096    Capcity buffer                      int ReadByte   0  int TotalRead   0                        while  TotalRead    file Length                                                    Read Bytes                          ReadByte   OpenFileGetBytes Read ReadAllbytes  0  ReadAllbytes Length                            TotalRead    ReadByte                              Write Bytes                          FileStreamOutput Write ReadAllbytes  0  ReadByte                                                FileStreamOutput Close                         OpenFileGetBytes Close                             PathFilesinArchive RemoveAt PosResult                                        if   PathFilesinArchive Count    0                       break                                           public ZipItem   ExtractItems string sourceArchiveFileName                List lt   ZipItem gt  ZipItemsReading   new List lt ZipItem gt                Opens the zip file up to be read          using  ZipArchive archive   ZipFile OpenRead sourceArchiveFileName                               Loops through each file in the zip file              foreach  ZipArchiveEntry file in archive Entries                                  Stream OpenFileGetBytes   file Open                      MemoryStream memstreams   new MemoryStream                     byte   ReadAllbytes   new byte 4096    Capcity buffer                  int ReadByte   0  int TotalRead   0                   while  TotalRead    file Length                                            Read Bytes                      ReadByte   OpenFileGetBytes Read ReadAllbytes  0  ReadAllbytes Length                        TotalRead    ReadByte                          Write Bytes                      memstreams Write ReadAllbytes  0  ReadByte                                        memstreams Position   0                   OpenFileGetBytes Close                     memstreams Dispose                      ZipItemsReading Add new ZipItem memstreams ToArray   file FullName                                          return ZipItemsReading ToArray                public ZipItem   ExtractItems string sourceArchiveFileName List lt  string gt   PathFilesinArchive                List lt   ZipItem gt  ZipItemsReading   new List lt ZipItem gt                Opens the zip file up to be read          using  ZipArchive archive   ZipFile OpenRead sourceArchiveFileName                              Loops through each file in the zip file              foreach  ZipArchiveEntry file in archive Entries                                  int PosResult    PathFilesinArchive IndexOf file FullName                     if  PosResult   -1                                          Stream OpenFileGetBytes   file Open                          MemoryStream memstreams   new MemoryStream                         byte   ReadAllbytes   new byte 4096    Capcity buffer                      int ReadByte   0  int TotalRead   0                         while  TotalRead    file Length                                                    Read Bytes                          ReadByte   OpenFileGetBytes Read ReadAllbytes  0  ReadAllbytes Length                            TotalRead    ReadByte                              Write Bytes                          memstreams Write ReadAllbytes  0  ReadByte                                                  Create item                      ZipItemsReading Add new ZipItem memstreams ToArray   file FullName                          OpenFileGetBytes Close                         memstreams Dispose                             PathFilesinArchive RemoveAt PosResult                                        if   PathFilesinArchive Count    0                       break                                        return ZipItemsReading ToArray

User · Answer

Thanks to ZipArchive creates invalid ZIP file  I got  using  var memoryStream   new MemoryStream         using  var archive   new ZipArchive memoryStream  ZipArchiveMode Create  true              var demoFile   archive CreateEntry  quot foo txt quot           using  var entryStream   demoFile Open          using  var streamWriter   new StreamWriter entryStream                    streamWriter Write  quot Bar  quot                     using  var fileStream   new FileStream   quot C  Temp test zip quot   FileMode Create              memoryStream Seek 0  SeekOrigin Begin         memoryStream CopyTo fileStream           That indicated we need to call Dispose on ZipArchive before we can use it  which as Amir suggests is likely because it writes final bytes like checksum to the archive that makes it complete  But in order not close the stream so we can re-use it after you need to pass true as the third parameter to ZipArchive

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Working solution for MVC      public ActionResult Index                 string fileName    test pdf           string fileName1    test vsix           string fileNameZip    Export     DateTime Now ToString  yyyyMMddhhmmss       zip            byte   fileBytes   System IO File ReadAllBytes   C  test test pdf            byte   fileBytes1   System IO File ReadAllBytes   C  test test vsix            byte   compressedBytes          using  var outStream   new MemoryStream                          using  var archive   new ZipArchive outStream  ZipArchiveMode Create  true                                 var fileInArchive   archive CreateEntry fileName  CompressionLevel Optimal                   using  var entryStream   fileInArchive Open                    using  var fileToCompressStream   new MemoryStream fileBytes                                         fileToCompressStream CopyTo entryStream                                      var fileInArchive1   archive CreateEntry fileName1  CompressionLevel Optimal                   using  var entryStream   fileInArchive1 Open                    using  var fileToCompressStream   new MemoryStream fileBytes1                                         fileToCompressStream CopyTo entryStream                                                 compressedBytes   outStream ToArray                      return File compressedBytes   application zip   fileNameZip

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Set the position of the stream to the 0 before copying it to the zip stream   using  var memoryStream   new MemoryStream       using  var archive   new ZipArchive memoryStream  ZipArchiveMode Create  true        var demoFile   archive CreateEntry  foo txt       using  var entryStream   demoFile Open      using  var streamWriter   new StreamWriter entryStream            streamWriter Write  Bar              using  var fileStream   new FileStream   C  Temp test zip   FileMode Create             memoryStream Position 0       memoryStream WriteTo fileStream

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This is the way to convert a entity to XML File and then compress it   private  void downloadFile EntityXML xml     string nameDownloadXml    File 1 xml   string nameDownloadZip    File 1 zip    var serializer   new XmlSerializer typeof EntityXML     Response Clear    Response ClearContent    Response ClearHeaders    Response AddHeader  content-disposition    attachment filename     nameDownloadZip    using  var memoryStream   new MemoryStream          using  var archive   new ZipArchive memoryStream  ZipArchiveMode Create  true                 var demoFile   archive CreateEntry nameDownloadXml           using  var entryStream   demoFile Open            using  StreamWriter writer   new StreamWriter entryStream  System Text Encoding UTF8                         serializer Serialize writer  xml                        using  var fileStream   Response OutputStream                memoryStream Seek 0  SeekOrigin Begin           memoryStream CopyTo fileStream            Response End

[c#] Creating a ZIP archive in memory using System.IO.Compression

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