這篇文章主要介紹“C# System.IO.Compression命名空間怎么實(shí)現(xiàn)”,在日常操作中,相信很多人在C# System.IO.Compression命名空間怎么實(shí)現(xiàn)問(wèn)題上存在疑惑,小編查閱了各式資料,整理出簡(jiǎn)單好用的操作方法,希望對(duì)大家解答”C# System.IO.Compression命名空間怎么實(shí)現(xiàn)”的疑惑有所幫助!接下來(lái),請(qǐng)跟著小編一起來(lái)學(xué)習(xí)吧!
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C# System.IO.Compression命名空間,注意:此命名空間在 .NET Framework 2.0 版中是新增的。C# System.IO.Compression命名空間包含提供基本的流壓縮和解壓縮服務(wù)的類。GZipStream提供用于壓縮和解壓縮流的方法和屬性。下面以 GZipStream 為例說(shuō)明
注意:此類在 .NET Framework 2.0 版中是新增的。
提供用于壓縮和解壓縮流的方法和屬性。
命名空間:System.IO.Compression
程序集:System(在 system.dll 中)
語(yǔ)法
Visual Basic(聲明)
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,"壓縮文件時(shí)發(fā)生錯(cuò)誤:",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,"解壓文件時(shí)發(fā)生錯(cuò)誤:",MessageBoxButtons.OK,MessageBoxIcon.Error); } finally ...{ //Makesureweallwayscloseallstreams if(sourceStream!=null) sourceStream.Close(); if(decompressedStream!=null) decompressedStream.Close(); if(destinationStream!=null) destinationStream.Close(); } } }
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