Use C # To Compress/decompress a 7-zip file

7-Zip Introduction

7-Zip is a compression software that claims to have the highest compression ratio today. It not only supports the unique 7z file format, but also supports a variety of other compression file formats, including ZIP, RAR, CAB, GZIP, BZIP2, TAR, etc. The compression ratio of this software is 30-50% higher than that of common ZIP files. Therefore, it can compress Zip files by 2-10%.
7-Zip Main Features
The algorithm is updated to increase the compression ratio of the 7z format.
Supported formats:
Compression and decompression: 7z, ZIP, GZIP, BZIP2, and TAR
Extract only: RAR, CAB, ISO, ARJ, LZH, CHM, WIM, Z, CPIO, RPM, DEB, and NSIS
For ZIP and GZIP formats, 7-Zip provides 2-10% higher compression ratio than PKZip and WinZip.
In the 7z format, you can create an auto-release (SFX) compressed file.
Integrated Windows Shell Extension
Powerful File Management
Powerful command line version
Support for FAR Manager plug-ins
Supports 69 languages

How to compress/decompress a 7-zip file in C #

1. Control the console to use the 7z.exe File

public static void Unzip(DirectoryInfo DirecInfo)
{
if (DirectInfo.Exists)
{
foreach (FileInfo fileInfo in DirecInfo.GetFiles("*.zip"))
{
Process process = new Process();
process.StartInfo.FileName = @"C:\Program Files\7-zip\7z.exe";
process.StartInfo.Arguments =                         @" e C:\Directory\" + fileInfo.Name + @" -o C:\Directory";
process.Start();
}
}
}
 
2. lzma sdk Based on the compression algorithm
Lzma sdk contains the C # source code of the compression and decompression algorithms (the current version is 4.65)
:　http://sourceforge.net/projects/sevenzip/files/LZMA%20SDK/4.65/lzma465.tar.bz2/download
3.Use the 7-Zip compression/Decompression function in. NET Applications(AuthorAbel AvramTranslatorZhao Yi)
Developer Eugene Sichkar creates a series of C # interfaces for 7-Zip dynamic link libraries, and uses the 7-Zip compression/Decompression function in. NET applications.
According to Eugene, the project implements the following interfaces:
 
 

  
  
IProgress-Basic progress callback
  
  
IArchiveOpenCallback-Open the callback of the compressed package
  
  
ICryptoGetTextPassword-Indicates the password callback for compression.
  
  
IArchiveExtractCallback-Callback for extracting the compressed package
  
  
IArchiveOpenVolumeCallback-Enable the callback for the extra compressed volume
  
  
ISequentialInStream-Basic read-only data stream Interfaces
  
  
ISequentialOutStream-Basic write-only Interfaces
  
  
IInStream-Input data stream interfaces that can be randomly read
  
  
IOutStream-Output data stream interface
  
  
IInArchive-Main compression Interfaces
 
 
For more information, see the example in the source code.
4.SevenZipSharp 
Markhor has created the SevenZipSharp project, which is open-source and implements self-extracting and compressing all formats supported by 7-ZIP. it improves some methods of the C # interface of the 7-Zip dynamic link library.
Examples of common compression/DecompressionSevenZipSharpExample file ):
Decompress the file
using (SevenZipExtractor tmp = new SevenZipExtractor(@"d:\Temp\7z465_extra.7z"))
{
for (int i = 0; i < tmp.ArchiveFileData.Count; i++)
{
tmp.ExtractFiles(@"d:\temp\!Пусто\", tmp.ArchiveFileData[i].Index);
}
//tmp.ExtractFiles(@"d:\temp\!Пусто\", 1, 3, 5); 
}
 
 
Volume Compression
SevenZipExtractor.SetLibraryPath(@"d:\Work\Misc\7zip\9.04\CPP\"+                                  7zip\Bundles\Format7zF\7z.dll");
using (SevenZipExtractor tmp = new SevenZipExtractor(@"d:\Temp\SevenZip.7z.001"))
{
tmp.ExtractArchive(@"d:\Temp\!Пусто");
}
Compressed file
SevenZipCompressor tmp = new SevenZipCompressor();
tmp.CompressFiles(@"d:\Temp\arch.7z", @"d:\Temp\log.txt");
tmp.CompressDirectory(@"c:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE\1033",                  @"D:\Temp\arch.7z");
ZIP file Compression
SevenZipCompressor tmp = new SevenZipCompressor();
tmp.ArchiveFormat = OutArchiveFormat.Zip;
tmp.CompressFiles(@"d:\Temp\arch.zip", @"d:\Temp\gpl.txt", @"d:\Temp\ru_office.txt");
Multi-thread Decompression
Thread t1 = new Thread(() =>
{
using (SevenZipExtractor tmp = new SevenZipExtractor(@"D:\Temp\7z465_extra.7z"))
{
tmp.FileExtractionStarted += new EventHandler<FileInfoEventArgs>((s, e) =>
{
Console.WriteLine(String.Format("[{0}%] {1}",
e.PercentDone, e.FileInfo.FileName));
});
tmp.ExtractionFinished +=                new EventHandler((s, e) => { Console.WriteLine("Finished!"); });
tmp.ExtractArchive(@"D:\Temp\t1");
}
});
Thread t2 = new Thread(() =>
{
using (SevenZipExtractor tmp = new SevenZipExtractor(@"D:\Temp\7z465_extra.7z"))
{
tmp.FileExtractionStarted += new EventHandler<FileInfoEventArgs>((s, e) =>
{
Console.WriteLine(String.Format("[{0}%] {1}",
e.PercentDone, e.FileInfo.FileName));
});
tmp.ExtractionFinished +=                 new EventHandler((s, e) => { Console.WriteLine("Finished!"); });
tmp.ExtractArchive(@"D:\Temp\t2");
}
});
t1.Start();
t2.Start();
t1.Join();
t2.Join();
Multi-thread Compression
Thread t1 = new Thread(() =>
{
SevenZipCompressor tmp = new SevenZipCompressor();
tmp.FileCompressionStarted += new EventHandler<FileNameEventArgs>((s, e) =>
{
Console.WriteLine(String.Format("[{0}%] {1}",
e.PercentDone, e.FileName));
});
tmp.CompressDirectory(@"D:\Temp\t1", @"D:\Temp\arch1.7z");
});
Thread t2 = new Thread(() =>
{
SevenZipCompressor tmp = new SevenZipCompressor();
tmp.FileCompressionStarted += new EventHandler<FileNameEventArgs>((s, e) =>
{
Console.WriteLine(String.Format("[{0}%] {1}",
e.PercentDone, e.FileName));
});
tmp.CompressDirectory(@"D:\Temp\t2", @"D:\Temp\arch2.7z");
});
t1.Start();
t2.Start();
t1.Join();
t2.Join();