C# 文件压缩与解压(ZIP格式)

         在企业开发过程中经常会遇到文件的压缩与解压，虽然网上很多流行的压缩文件格式都是RAR的，但是由于RAR不是一个开放的标准，因此ZIP成了更多人的选择。如果你不想自己开发的话可以选择开源的项目，比如SharpZipLib就是一个不错的选择。

组件的使用比较简单，请参照下面的代码。点击下载项目源码

/*
  * Gary Zhang -- [email protected]
  * www.cbcye.com
  * www.quicklearn.cn
  * cbcye.cnblogs.com
  */
 using System;
 using System.Collections.Generic;
 using System.Text;
 using System.IO;
 using ICSharpCode.SharpZipLib.Zip;
 using System.Diagnostics;
 using ICSharpCode.SharpZipLib.Core;
 
namespace TestConsole
 {
     class Program
     {
         static void Main()
         {
             //CreateZipFile(@"d:\", @"d:\a.zip");
             UnZipFile(@"d:\a.zip");
 
            Console.Read();
         }
 
        private static void CreateZipFile(string filesPath, string zipFilePath)
         {
 
            if (!Directory.Exists(filesPath))
             {
                 Console.WriteLine("Cannot find directory '{0}'", filesPath);
                 return;
             }
 
            try
             {
                 string[] filenames = Directory.GetFiles(filesPath);
                 using (ZipOutputStream s = new ZipOutputStream(File.Create(zipFilePath)))
                 {
 
                    s.SetLevel(9); // 压缩级别 0-9
                     //s.Password = "123"; //Zip压缩文件密码
                     byte[] buffer = new byte[4096]; //缓冲区大小
                     foreach (string file in filenames)
                     {
                         ZipEntry entry = new ZipEntry(Path.GetFileName(file));
                         entry.DateTime = DateTime.Now;
                         s.PutNextEntry(entry);
                         using (FileStream fs = File.OpenRead(file))
                         {
                             int sourceBytes;
                             do
                             {
                                 sourceBytes = fs.Read(buffer, 0, buffer.Length);
                                 s.Write(buffer, 0, sourceBytes);
                             } while (sourceBytes > 0);
                         }
                     }
                     s.Finish();
                     s.Close();
                 }
             }
             catch (Exception ex)
             {
                 Console.WriteLine("Exception during processing {0}", ex);
             }
         }
 
        private static void UnZipFile( string zipFilePath)
         {
             if (!File.Exists(zipFilePath))
             {
                 Console.WriteLine("Cannot find file '{0}'", zipFilePath);
                 return;
             }
 
            using (ZipInputStream s = new ZipInputStream(File.OpenRead(zipFilePath)))
             {
 
                ZipEntry theEntry;
                 while ((theEntry = s.GetNextEntry()) != null)
                 {
 
                    Console.WriteLine(theEntry.Name);
 
                    string directoryName = Path.GetDirectoryName(theEntry.Name);
                     string fileName = Path.GetFileName(theEntry.Name);
 
                    // create directory
                     if (directoryName.Length > 0)
                     {
                         Directory.CreateDirectory(directoryName);
                     }
 
                    if (fileName != String.Empty)
                     {
                         using (FileStream streamWriter = File.Create(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;
                                 }
                             }
                         }
                     }
                 }
             }
         }
     }
 
}
 

转自：http://www.cnblogs.com/cbcye/archive/2009/03/10/1407672.html