C#System.IO.Compression命名空间

C# System.IO.Compression命名空间，注意：此命名空间在 .NET Framework 2.0 版中是新增的。C# System.IO.Compression命名空间包含提供基本的流压缩和解压缩服务的类。GZipStream提供用于压缩和解压缩流的方法和属性。下面以 GZipStream  为例说明

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注意：此类在 .NET Framework 2.0 版中是新增的。

提供用于压缩和解压缩流的方法和属性。
命名空间:System.IO.Compression
程序集:System（在 system.dll 中）
语法
Visual Basic（声明）
Public Class GZipStream
Inherits Stream
Visual Basic（用法）
Dim instance As GZipStream

C#
public class GZipStream : Stream

C++
public ref class GZipStream : public Stream

J#
public class GZipStream extends Stream

JScript
public class GZipStream extends Stream

 
 
 

  
  
  
classclsZip 
  
  
  
...{ 
  
  
  
publicvoidCompressFile(stringsourceFile,stringdestinationFile) 
  
  
  
...{ 
  
  
  
//makesurethesourcefileisthere 
  
  
  
if(File.Exists(sourceFile)==false) 
  
  
  
thrownewFileNotFoundException(); 
  
  
  

  
  
  
//Createthestreamsandbytearraysneeded 
  
  
  
byte[]buffer=null; 
  
  
  
FileStreamsourceStream=null; 
  
  
  
FileStreamdestinationStream=null; 
  
  
  
GZipStreamcompressedStream=null; 
  
  
  

  
  
  
try 
  
  
  
...{ 
  
  
  
//Readthebytesfromthesourcefileintoabytearray 
  
  
  
sourceStream=newFileStream(sourceFile,FileMode.Open,FileAccess.Read,FileShare.Read); 
  
  
  

  
  
  
//Readthesourcestreamvaluesintothebuffer 
  
  
  
buffer=newbyte[sourceStream.Length]; 
  
  
  
intcheckCounter=sourceStream.Read(buffer,0,buffer.Length); 
  
  
  

  
  
  
if(checkCounter!=buffer.Length) 
  
  
  
...{ 
  
  
  
thrownewApplicationException(); 
  
  
  
} 
  
  
  

  
  
  
//OpentheFileStreamtowriteto 
  
  
  
destinationStream=newFileStream(destinationFile,FileMode.OpenOrCreate,FileAccess.Write); 
  
  
  

  
  
  
//Createacompressionstreampointingtothedestiantionstream 
  
  
  
compressedStream=newGZipStream(destinationStream,CompressionMode.Compress,true); 
  
  
  

  
  
  
//Nowwritethecompresseddatatothedestinationfile 
  
  
  
compressedStream.Write(buffer,0,buffer.Length); 
  
  
  
} 
  
  
  
catch(ApplicationExceptionex) 
  
  
  
...{ 
  
  
  
MessageBox.Show(ex.Message,"压缩文件时发生错误：",MessageBoxButtons.OK,MessageBoxIcon.Error); 
  
  
  
} 
  
  
  
finally 
  
  
  
...{ 
  
  
  
//Makesureweallwayscloseallstreams 
  
  
  
if(sourceStream!=null) 
  
  
  
sourceStream.Close(); 
  
  
  

  
  
  
if(compressedStream!=null) 
  
  
  
compressedStream.Close(); 
  
  
  

  
  
  
if(destinationStream!=null) 
  
  
  
destinationStream.Close(); 
  
  
  
} 
  
  
  
} 
  
  
  

  
  
  
publicvoidDecompressFile(stringsourceFile,stringdestinationFile) 
  
  
  
...{ 
  
  
  
//makesurethesourcefileisthere 
  
  
  
if(File.Exists(sourceFile)==false) 
  
  
  
thrownewFileNotFoundException(); 
  
  
  

  
  
  
//Createthestreamsandbytearraysneeded 
  
  
  
FileStreamsourceStream=null; 
  
  
  
FileStreamdestinationStream=null; 
  
  
  
GZipStreamdecompressedStream=null; 
  
  
  
byte[]quartetBuffer=null; 
  
  
  

  
  
  
try 
  
  
  
...{ 
  
  
  
//Readinthecompressedsourcestream 
  
  
  
sourceStream=newFileStream(sourceFile,FileMode.Open); 
  
  
  

  
  
  
//Createacompressionstreampointingtothedestiantionstream 
  
  
  
decompressedStream=newGZipStream(sourceStream,CompressionMode.Decompress,true); 
  
  
  

  
  
  
//Readthefootertodeterminethelengthofthedestiantionfile 
  
  
  
quartetBuffer=newbyte[4]; 
  
  
  
intposition=(int)sourceStream.Length-4; 
  
  
  
sourceStream.Position=position; 
  
  
  
sourceStream.Read(quartetBuffer,0,4); 
  
  
  
sourceStream.Position=0; 
  
  
  
intcheckLength=BitConverter.ToInt32(quartetBuffer,0); 
  
  
  

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

  
  
  
intoffset=0; 
  
  
  
inttotal=0; 
  
  
  

  
  
  
//Readthecompresseddataintothebuffer 
  
  
  
while(true) 
  
  
  
...{ 
  
  
  
intbytesRead=decompressedStream.Read(buffer,offset,100); 
  
  
  

  
  
  
if(bytesRead==0) 
  
  
  
break; 
  
  
  

  
  
  
offset+=bytesRead; 
  
  
  
total+=bytesRead; 
  
  
  
} 
  
  
  

  
  
  
//Nowwriteeverythingtothedestinationfile 
  
  
  
destinationStream=newFileStream(destinationFile,FileMode.Create); 
  
  
  
destinationStream.Write(buffer,0,total); 
  
  
  

  
  
  
//andflusheveryhtingtocleanoutthebuffer 
  
  
  
destinationStream.Flush(); 
  
  
  
} 
  
  
  
catch(ApplicationExceptionex) 
  
  
  
...{ 
  
  
  
MessageBox.Show(ex.Message,"解压文件时发生错误：",
MessageBoxButtons.OK,MessageBoxIcon.Error); 
  
  
  
} 
  
  
  
finally 
  
  
  
...{ 
  
  
  
//Makesureweallwayscloseallstreams 
  
  
  
if(sourceStream!=null) 
  
  
  
sourceStream.Close(); 
  
  
  

  
  
  
if(decompressedStream!=null) 
  
  
  
decompressedStream.Close(); 
  
  
  

  
  
  
if(destinationStream!=null) 
  
  
  
destinationStream.Close(); 
  
  
  
} 
  
  
  

  
  
  
} 
  
  
  
}
 
 
 

以上介绍C# System.IO.Compression命名空间

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