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本文实例讲述了asp.net C#实现解压缩文件的方法。一共给大家介绍了三段代码，一个是简单的解压缩单个zip文件，后一个可以解压批量的大量的但需要调用ICSharpCode.SharpZipLib.dll类了，最后一个比较实例可压缩也可以解压缩了分享给大家供大家参考。具体如下：

解压缩单个文件：

代码如下:

using System.IO;

using System.IO.Compression;

string sourceFile=@"D:2.zip";

string destinationFile=@"D:1.txt";

private const long BUFFER_SIZE = 20480;

// make sure the source file is there

if (File.Exists ( sourceFile ))

{

FileStream sourceStream = null;

FileStream destinationStream = null;

GZipStream decompressedStream = null;

byte[] quartetBuffer = null;

try

{

// Read in the compressed source stream

sourceStream = new FileStream ( sourceFile, FileMode.Open );

// Create a compression stream pointing to the destiantion stream

decompressedStream = new DeflateStream ( sourceStream, CompressionMode.Decompress, true );

// Read the footer to determine the length of the destiantion file

quartetBuffer = new byte[4];

int position = (int)sourceStream.Length - 4;

sourceStream.Position = position;

sourceStream.Read ( quartetBuffer, 0, 4 );

sourceStream.Position = 0;

int checkLength = BitConverter.ToInt32 ( quartetBuffer, 0 );

byte[] buffer = new byte[checkLength + 100];

int offset = 0;

int total = 0;

// Read the compressed data into the buffer

while ( true )

{

int bytesRead = decompressedStream.Read ( buffer, offset, 100 );

if ( bytesRead == 0 )

break;

offset += bytesRead;

total += bytesRead;

}

// Now write everything to the destination file

destinationStream = new FileStream ( destinationFile, FileMode.Create );

destinationStream.Write ( buffer, 0, total );

// and flush everyhting to clean out the buffer

destinationStream.Flush ( );

}

catch ( ApplicationException ex )

{

Console.WriteLine(ex.Message, "解压文件时发生错误：");

}

finally

{

// Make sure we allways close all streams

if ( sourceStream != null )

sourceStream.Close ( );

if ( decompressedStream != null )

decompressedStream.Close ( );

if ( destinationStream != null )

destinationStream.Close ( );

}

}

批量解压缩(这需要调用一个解压缩类库。。 ICSharpCode.SharpZipLib.dll)

代码如下:

using System;

using System.IO;

using System.Collections.Generic;

using System.Text;

using ICSharpCode.SharpZipLib.Zip;

namespace ZipLib

{

/// <summary>

/// 解压缩类

/// </summary>

public static class ZIP

{

/// <summary>

/// 解压ZIP文件包

/// </summary>

/// <param name="strZipFile">ZIP文件路径</param>

/// <param name="strDir">解压后的文件目录路径</param>

/// <returns>是否解压成功</returns>

public static bool unzipFiles(string strZipFile, string strDir)

{

//判断ZIP文件是否存在

if (File.Exists(strZipFile))

{

//判断目录是否存在

bool bUnzipDir = false;

//判断是否需要创建目录

if (!Directory.Exists(strDir))

bUnzipDir = (Directory.CreateDirectory(strDir) != null);

else

bUnzipDir = true;

//如果解压目录存在

if (bUnzipDir)

{

//获得ZIP数据流

ZipInputStream zipStream = new ZipInputStream(File.OpenRead(strZipFile));

if (zipStream != null)

{

ZipEntry zipEntry = null;

while ((zipEntry = zipStream.GetNextEntry()) != null)

{

string strUnzipFile = strDir + "//" + zipEntry.Name;

string strFileName = Path.GetFileName(strUnzipFile);

string strDirName = Path.GetDirectoryName(strUnzipFile);

//是否为解压目录

if (!string.IsNullOrEmpty(strDirName))

Directory.CreateDirectory(strDirName);

//是否为解压文件

if (!string.IsNullOrEmpty(strFileName))

{

//解压文件

FileStream unzipFileStream = new FileStream(strUnzipFile, FileMode.Create);

if (unzipFileStream != null)

{

byte[] buf = new byte[2048];

int size = 0;

while ((size = zipStream.Read(buf, 0, 2048)) > 0)

unzipFileStream.Write(buf, 0, size);

//关闭Stream

unzipFileStream.Flush();

unzipFileStream.Close();

}

}

}

//关闭ZIP流

zipStream.Close();

//返回值

return true;

}

}

}

return false;

}

}

}

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