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Zipping using System.IO.Compression

, 1 Nov 2013
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This post shows how to create a zip package using System.IO.Compressio.

To use System.IO.Compression, you need to add a reference to WindowsBase.dll.

The following code snippet shows how to use some of the provided functionalities:

using System;
using System.Collections.Generic;
using System.IO;
using System.IO.Packaging;

public static class ZipHelper
{
  public static void ZipFiles(string path, IEnumerable<string> files, 
         CompressionOption compressionLevel = CompressionOption.Normal)
  {
    using (FileStream fileStream = new FileStream(path, FileMode.Create))
    {
      ZipHelper.ZipFilesToStream(fileStream, files, compressionLevel);
    }
  }

  public static byte[] ZipFilesToByteArray(IEnumerable<string> files, 
         CompressionOption compressionLevel = CompressionOption.Normal)
  {
    byte[] zipBytes = default(byte[]);
    using (MemoryStream memoryStream = new MemoryStream())
    {
      ZipHelper.ZipFilesToStream(memoryStream, files, compressionLevel);
      memoryStream.Flush();
      zipBytes = memoryStream.ToArray();
    }

    return zipBytes;
  }

  public static void Unzip(string zipPath, string baseFolder)
  {
    using (FileStream fileStream = new FileStream(zipPath, FileMode.Open))
    {
      ZipHelper.UnzipFilesFromStream(fileStream, baseFolder);
    }
  }

  public static void UnzipFromByteArray(byte[] zipData, string baseFolder)
  {
    using (MemoryStream memoryStream = new MemoryStream(zipData))
    {
      ZipHelper.UnzipFilesFromStream(memoryStream, baseFolder);
    }
  }

  private static void ZipFilesToStream(Stream destination, 
          IEnumerable<string> files, CompressionOption compressionLevel)
  {
    using (Package package = Package.Open(destination, FileMode.Create))
    {
      foreach (string path in files)
      {
        // fix for white spaces in file names (by ErrCode)
        Uri fileUri = PackUriHelper.CreatePartUri(new Uri(@"/" + 
                      Path.GetFileName(path), UriKind.Relative));
        string contentType = @"data/" + ZipHelper.GetFileExtentionName(path);

        using (Stream zipStream = 
                package.CreatePart(fileUri, contentType, compressionLevel).GetStream())
        {
          using (FileStream fileStream = new FileStream(path, FileMode.Open))
          {
            fileStream.CopyTo(zipStream);
          }
        }
      }
    }
  }

  private static void UnzipFilesFromStream(Stream source, string baseFolder)
  {
    if (!Directory.Exists(baseFolder))
    {
      Directory.CreateDirectory(baseFolder);
    }

    using (Package package = Package.Open(source, FileMode.Open))
    {
      foreach (PackagePart zipPart in package.GetParts())
      {
        // fix for white spaces in file names (by ErrCode)
        string path = Path.Combine(baseFolder, 
             Uri.UnescapeDataString(zipPart.Uri.ToString()).Substring(1));

        using (Stream zipStream = zipPart.GetStream())
        {
          using (FileStream fileStream = new FileStream(path, FileMode.Create))
          {
            zipStream.CopyTo(fileStream);
          }
        }
      }
    }
  }

  private static string GetFileExtentionName(string path)
  {
    string extention = Path.GetExtension(path);
    if (!string.IsNullOrWhiteSpace(extention) && extention.StartsWith("."))
    {
      extention = extention.Substring(1);
    }

    return extention;
  }
}

Enjoy it!

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

Tecfield
Software Developer (Senior)
United States United States
I got my BS in Software Engineering from Iran, worked there for 4.5 years mainly in industrial automation field. Then I moved to Australia. In Australia, I had a great chance to work at some big companies. Since 2009 I have been living in the States. I received my MS in Information Systems from Illinois State University. Currently, I am a Senior Software Development Engineer.

Comments and Discussions

 
GeneralArticle with demo of compression. PinprotectorDaveAuld1-Nov-13 6:56 
GeneralRe: Article with demo of compression. PinmemberTecfield1-Nov-13 7:59 
GeneralMy vote of 3 [modified] PinmemberBillWoodruff15-Jul-13 18:25 
... edit: suggestion: clarify for the reader that the purpose of this example is to create a zipped folder (package) from a set of files, or to unzip a set of zipped files in a zipped folder (package) ...
 
0. In spite of the fact that WindowsBase.dll is notoriously hard to find [^], the author doesn't bother to mention that, or help the reader find it.

1. the author of this article states, in a response, to a message: "There is an alternate version for .NET 3.5 in this thread. Please check it out." There is no alternate version link in this article, or the comments.

2. there are alternate methods, clearly documented by MSDN, that do not require a reference to WindowsBase.dll.
 
Note that in .NET 4.5 "WindowsBase.dll" is considered an "obsolete" Type: [^], which does not mean this cannot work in 4.5.
 
fyi: on my current system (Win 8/64), Visual Studio 2012. There are 37 instances of WindowsBase.dll ! Some are specific to WPF.
 
Have a few:
 
C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v3.5\Profile\Client\WindowsBase.dll
 
C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.0\WindowsBase.dll
 
C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.0\Profile\Client\WindowsBase.dll
 
C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5\WindowsBase.dll
 
C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.0\WindowsBase.dll
 
C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.0\WindowsBase.dll
 
C:\Windows\assembly\GAC_MSIL\WindowsBase\3.0.0.0__31bf3856ad364e35\WindowsBase.dll
 
C:\Windows\Microsoft.NET\assembly\GAC_MSIL\WindowsBase\v4.0_4.0.0.0__31bf3856ad364e35\WindowsBase.dll
 
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\WPF\WindowsBase.dll
 
C:\Windows\Microsoft.NET\Framework\v4.0.30319\WPF\WindowsBase.dll

modified 16-Jul-13 1:16am.

GeneralRe: My vote of 3 PinmemberTecfield16-Jul-13 3:09 
GeneralRe: My vote of 3 PinmemberBillWoodruff24-Jul-13 23:34 
GeneralRe: My vote of 3 PinmemberTecfield25-Jul-13 3:03 
GeneralMy vote of 5 PinmemberAbey Thomas2-Nov-12 20:44 
QuestionCopy Stream PingroupPaul @ The Computer Station31-Oct-12 12:39 
AnswerRe: Copy Stream PinmemberTecfield1-Nov-12 3:13 
Questionpackage.GetParts() issue in UnzipFilesFromStream PinmemberAyusman110-Aug-12 2:39 
AnswerRe: package.GetParts() issue in UnzipFilesFromStream PinmemberTecfield10-Aug-12 3:08 
GeneralRe: Sorry, no malice intended here, but this is a general commen... PinmemberDarren Doody26-Jan-12 15:14 
GeneralReason for my vote of 5 this is better than j . Pinmemberjavaevangelist7-Feb-12 8:39 
GeneralNice, but please specify .NET version required. In the titl... PinmemberDarren Doody26-Jan-12 13:00 
GeneralRe: As long as you can make a reference to <code>WindowsBase.dll... PinmemberTecfield26-Jan-12 15:05 
GeneralReason for my vote of 5 Nice example Pinmemberloctrice24-Jan-12 9:09 
GeneralVery nice. It does not handle subdirectories (at least not i... Pinmemberloctrice24-Jan-12 9:08 
GeneralReason for my vote of 5 it is nice one. works with out any t... Pinmembervenkata124-Jan-12 5:16 
GeneralThank you very much for the good article. But I tried to zip... Pinmembervenkata124-Jan-12 5:10 
GeneralRe: Sorry. I got it working. This is due to the white space in S... Pinmembervenkata124-Jan-12 5:14 
SuggestionRe: Sorry. I got it working. This is due to the white space in S... PinmemberErrCode31-Oct-13 19:31 
GeneralRe: Sorry. I got it working. This is due to the white space in S... PinmemberTecfield1-Nov-13 1:34 
GeneralThere is no license mentioned here. Can one use this code in... Pinmemberivanicin23-Jan-12 13:37 
GeneralRe: Its license is "The Code Project Open License (CPOL)". PinmemberTecfield23-Jan-12 16:55 
GeneralRe: it's a general library tip, you can anywy always use that in... PinmemberThatsAlok24-Jan-12 1:53 

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