首先需要在項目里引用SharpZipLib.dll。然后修改其中的關于壓縮和解壓縮的類。實現源碼如下：

/**/ /// <summary>
/// 壓縮文件
/// </summary>

using System;
using System.IO;

using ICSharpCode.SharpZipLib.Checksums;
using ICSharpCode.SharpZipLib.Zip;
using ICSharpCode.SharpZipLib.GZip;

namespace Compression
... {
public class ZipClass
... {

public void ZipFile( string FileToZip, string ZipedFile, int CompressionLevel, int BlockSize)
... {
// 如果文件沒有找到，則報錯
if ( ! System.IO.File.Exists(FileToZip))
... {
throw new System.IO.FileNotFoundException( " Thespecifiedfile " + FileToZip + " couldnotbefound.Zippingaborderd " );
}

System.IO.FileStreamStreamToZip = new System.IO.FileStream(FileToZip,System.IO.FileMode.Open,System.IO.FileAccess.Read);
System.IO.FileStreamZipFile = System.IO.File.Create(ZipedFile);
ZipOutputStreamZipStream = new ZipOutputStream(ZipFile);
ZipEntryZipEntry = new ZipEntry( " ZippedFile " );
ZipStream.PutNextEntry(ZipEntry);
ZipStream.SetLevel(CompressionLevel);
byte []buffer = new byte [BlockSize];
System.Int32size = StreamToZip.Read(buffer, 0 ,buffer.Length);
ZipStream.Write(buffer, 0 ,size);
try
... {
while (size < StreamToZip.Length)
... {
int sizeRead = StreamToZip.Read(buffer, 0 ,buffer.Length);
ZipStream.Write(buffer, 0 ,sizeRead);
size += sizeRead;
}
}
catch (System.Exceptionex)
... {
throw ex;
}
ZipStream.Finish();
ZipStream.Close();
StreamToZip.Close();
}

public void ZipFileMain( string []args)
... {
string []filenames = Directory.GetFiles(args[ 0 ]);

Crc32crc = new Crc32();
ZipOutputStreams = new ZipOutputStream(File.Create(args[ 1 ]));

s.SetLevel( 6 ); // 0-storeonlyto9-meansbestcompression

foreach ( string file in filenames)
... {
// 打開壓縮文件
FileStreamfs = File.OpenRead(file);

byte []buffer = new byte [fs.Length];
fs.Read(buffer, 0 ,buffer.Length);
ZipEntryentry = new ZipEntry(file);

entry.DateTime = DateTime.Now;

// setSizeandthecrc,becausetheinformation
// aboutthesizeandcrcshouldbestoredintheheader
// ifitisnotsetitisautomaticallywritteninthefooter.
// (inthiscasesize==crc==-1intheheader)
// SomeZIPprogramshaveproblemswithzipfilesthatdon'tstore
// thesizeandcrcintheheader.
entry.Size = fs.Length;
fs.Close();

crc.Reset();
crc.Update(buffer);

entry.Crc = crc.Value;

s.PutNextEntry(entry);

s.Write(buffer, 0 ,buffer.Length);

}

s.Finish();
s.Close();
}
}
}

現在再來看看解壓文件類的源碼

/**/ /// <summary>
/// 解壓文件
/// </summary>

using System;
using System.Text;
using System.Collections;
using System.IO;
using System.Diagnostics;
using System.Runtime.Serialization.Formatters.Binary;
using System.Data;

using ICSharpCode.SharpZipLib.BZip2;
using ICSharpCode.SharpZipLib.Zip;
using ICSharpCode.SharpZipLib.Zip.Compression;
using ICSharpCode.SharpZipLib.Zip.Compression.Streams;
using ICSharpCode.SharpZipLib.GZip;

namespace DeCompression
... {
public class UnZipClass
... {
public void UnZip( string []args)
... {
ZipInputStreams = new ZipInputStream(File.OpenRead(args[ 0 ]));

ZipEntrytheEntry;
while ((theEntry = s.GetNextEntry()) != null )
... {

string directoryName = Path.GetDirectoryName(args[ 1 ]);
string fileName = Path.GetFileName(theEntry.Name);

// 生成解壓目錄
Directory.CreateDirectory(directoryName);

if (fileName != String.Empty)
... {
// 解壓文件到指定的目錄
FileStreamstreamWriter = File.Create(args[ 1 ] + theEntry.Name);

int size = 2048 ;
byte []data = new byte [ 2048 ];
while ( true )
... {
size = s.Read(data, 0 ,data.Length);
if (size > 0 )
... {
streamWriter.Write(data, 0 ,size);
}
else
... {
break ;
}
}

streamWriter.Close();
}
}
s.Close();
}
}
}

有了壓縮和解壓縮的類以后，就要在窗體里調用了。怎么？是新手，不會調用？Ok,接著往下看如何在窗體里調用。

首先在窗體里放置兩個命令按鈕（不要告訴我你不會放啊~），然后編寫以下源碼

/// <summary>
/// 調用源碼
/// </summary>

private void button2_Click_1(object sender, System.EventArgs e)
{
string []FileProperties=new string[2];
FileProperties[0]="C:/unzipped/";//待壓縮文件目錄
FileProperties[1]="C:/zip/a.zip"; //壓縮后的目標文件
ZipClass Zc=new ZipClass();
Zc.ZipFileMain(FileProperties);
}

private void button2_Click(object sender, System.EventArgs e)
{
string []FileProperties=new string[2];
FileProperties[0]="C:/zip/test.zip";//待解壓的文件
FileProperties[1]="C:/unzipped/";//解壓后放置的目標目錄
UnZipClass UnZc=new UnZipClass();
UnZc.UnZip(FileProperties);
}

好了，到此為止，如何壓縮和解壓縮的類都已經完成了

利用SharpZipLib進行文件的壓縮和解壓縮