DotNetZip - Zip and Unzip in C#, VB, any .NET language

DotNetZip is an easy-to-use, FAST, FREE class library and toolset for manipulating zip files or folders. Zip and Unzip is easy: with DotNetZip, .NET applications written in VB, C# - any .NET language - can easily create, read, extract, or update zip files. For Mono or MS .NET.

DotNetZip is the best ZIP library for .NET



DotNetZip is a 100% managed code library that can be used in any .NET application - Console, Winforms, WPF, ASP.NET, Sharepoint, Web services apps, and so on. New for v1.9.1.6: Silverlight. It can also be used from scripting environments or COM-capable environments like Powershell scripts, VBScript, VBA, VB6, PHP, Perl, Javascript, and more. Whatever environment it is used from, DotNetZip produces zip files that are fully interoperable with Windows Explorer, as well as Java applications, apps running on Linux.

It is designed to be simple and easy to use. DotNetZip is packaged as a single DLL, about 400k in size. It has no third-party dependencies. It is Medium Trust, so can be used on most hosters. Get zipping just by referencing the DLL. The library supports zip passwords, Unicode, ZIP64, stream input and output, AES encryption, multiple compression levels, self-extracting archives, spanned archives, and more.

DotNetZip works on PCs with the full .NET Framework, and also runs on mobile devices that use the .NET Compact Framework. Create and read zip files in VB, C#, or any .NET language, or any scripting environment. DotNetZip supports these scenarios:
- a Silverlight app that dynamically creates zip files.
- an ASP.NET app that dynamically creates ZIP files and allows a browser to download them
- a Windows Service that periodically zips up a directory for backup and archival purposes
- a WPF program that modifies existing archives - renaming entries, removing entries from an archive, or adding new entries to an archive
- a Windows Forms app that creates AES-encrypted zip archives for privacy of archived content.
- a SSIS script that unzips or zips
- An administrative script in PowerShell or VBScript that performs backup and archival.
- a WCF service that receives a zip file as an attachment, and dynamically unpacks the zip to a stream for analysis
- an old-school ASP (VBScript) application that produces a ZIP file via the COM interface for DotNetZIp
- a Windows Forms app that reads or updates ODS files
- creating zip files from stream content, saving to a stream, extracting to a stream, reading from a stream
- creation of self-extracting archives.

If all you want is a better DeflateStream or GZipStream class to replace the one that is built-into the .NET BCL, DotNetZip has that, too. DotNetZip's DeflateStream and GZipStream are available in a standalone assembly, based on a .NET port of Zlib. These streams support compression levels and deliver much better performance than the built-in classes. There is also a ZlibStream to complete the set (RFC 1950, 1951, 1952).

And the price for all this: totally FREE.


Example Usage
Here's some C# code that creates a zip file.

using (ZipFile zip = new ZipFile())
 {
     // add this map file into the "images" directory in the zip archive
     zip.AddFile("c:\\images\\personal\\7440-N49th.png", "images");
     // add the report into a different directory in the archive
     zip.AddFile("c:\\Reports\\2008-Regional-Sales-Report.pdf", "files");
     zip.AddFile("ReadMe.txt");
     zip.Save("MyZipFile.zip");
 } 

Here is some VB code that unpacks a zip file (extracts all the entries):
  Dim ZipToUnpack As String = "C1P3SML.zip"  
   Dim TargetDir As String = "C1P3SML"  
   Console.WriteLine("Extracting file {0} to {1}", ZipToUnpack, TargetDir)   
   Using zip1 As ZipFile = ZipFile.Read(ZipToUnpack)   
       AddHandler zip1.ExtractProgress, AddressOf MyExtractProgress   
       Dim e As ZipEntry   
       ' here, we extract every entry, but we could extract    
       ' based on entry name, size, date, etc.   
       For Each e In zip1   
           e.Extract(TargetDir, ExtractExistingFileAction.OverwriteSilently)   
       Next  
   End Using 

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