C#实现文件压缩与解压的方法示例【ZIP格式】

/*
 * Gary Zhang -- cbcye@live.com
 * 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;
                }
              }
            }
          }
        }
      }
    }
  }
}