在C#中利用SharpZipLib进行文件的压缩和解压缩

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我在做项目的时候需要将文件进行压缩和解压缩，于是就从http://www.icsharpcode.net下载了关于压缩和解压缩的源码，但是下载下来后，面对这么多的代码，一时不知如何下手。只好耐下心来，慢慢的研究，总算找到了门路。针对自己的需要改写了文件压缩和解压缩的两个类，分别为ZipClass和UnZipClass。其中碰到了不少困难，就决定写出来压缩和解压的程序后，一定把源码贴出来共享，让首次接触压缩和解压缩的朋友可以少走些弯路。下面就来解释如何在C#里用http://www.icsharpcode.net下载的SharpZipLib进行文件的压缩和解压缩。
首先需要在项目里引用SharpZipLib.dll。然后修改其中的关于压缩和解压缩的类。实现源码如下：
///

/// 压缩文件 ///
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) { //如果文件没有找到，则报错 if (! System.IO.File.Exists(FileToZip)) { throw new System.IO.FileNotFoundException("The specified file " + FileToZip + " could not be found. Zipping aborderd"); } System.IO.FileStream StreamToZip = new System.IO.FileStream(FileToZip,System.IO.FileMode.Open , System.IO.FileAccess.Read); System.IO.FileStream ZipFile = System.IO.File.Create(ZipedFile); ZipOutputStream ZipStream = new ZipOutputStream(ZipFile); ZipEntry ZipEntry = new ZipEntry("ZippedFile"); ZipStream.PutNextEntry(ZipEntry); ZipStream.SetLevel(CompressionLevel); byte[] buffer = new byte[BlockSize]; System.Int32 size =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.Exception ex) { throw ex; } ZipStream.Finish(); ZipStream.Close(); StreamToZip.Close(); } public void ZipFileMain(string[] args) { string[] filenames = Directory.GetFiles(args[0]); Crc32 crc = new Crc32(); ZipOutputStream s = new ZipOutputStream(File.Create(args[1])); s.SetLevel(6); // 0 - store only to 9 - means best compression foreach (string file in filenames) { //打开压缩文件 FileStream fs = File.OpenRead(file); byte[] buffer = new byte[fs.Length]; fs.Read(buffer, 0, buffer.Length); ZipEntry entry = new ZipEntry(file); entry.DateTime = DateTime.Now; // set Size and the crc, because the information // about the size and crc should be stored in the header // if it is not set it is automatically written in the footer. // (in this case size == crc == -1 in the header) // Some ZIP programs have problems with zip files that don't store // the size and crc in the header. 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(); } }}
现在再来看看解压文件类的源码
///

/// 解压文件 ///
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) { ZipInputStream s = new ZipInputStream(File.OpenRead(args[0])); ZipEntry theEntry; while ((theEntry = s.GetNextEntry()) != null) { string directoryName = Path.GetDirectoryName(args[1]); string fileName = Path.GetFileName(theEntry.Name); //生成解压目录 Directory.CreateDirectory(directoryName); if (fileName != String.Empty) { //解压文件到指定的目录 FileStream streamWriter = 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(); } }}
有了压缩和解压缩的类以后，就要在窗体里调用了。怎么？是新手，不会调用？Ok,接着往下看如何在窗体里调用。
首先在窗体里放置两个命令按钮（不要告诉我你不会放啊~），然后编写以下源码
///

/// 调用源码 ///
private void button2_Click_1(object sender, System.EventArgs e) { string []FileProperties=new string[2]; FileProperties[0]="C://unzipped//";//待压缩文件目录 FileProperties[1]="C://zip//a.zip"; //压缩后的目标文件 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";//待解压的文件 FileProperties[1]="C://unzipped//";//解压后放置的目标目录 UnZipClass UnZc=new UnZipClass(); UnZc.UnZip(FileProperties); }
好了，到此为止，如何压缩和解压缩的类都已经完成了，需要的朋友直接拿走调吧。