C# System.IO.Compression命名空间怎么实现-编程学习网

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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

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();  
}  
 
}  
}