C# 利用ICSharpCode.SharpZipLib实现在线压缩和解压缩

  /// <summary>
  /// 压缩枚举
  /// </summary>
  public enum ZipEnum
  {
    //压缩时间长，压缩率高
    BZIP2,

    //压缩效率高，压缩率低
    GZIP
  }

    #region 制作压缩包（单个文件压缩）
    /// <summary>
    /// 制作压缩包（单个文件压缩）
    /// </summary>
    /// <param name="sourceFileName">原文件</param>
    /// <param name="zipFileName">压缩文件</param>
    /// <param name="zipEnum">压缩算法枚举</param>
    /// <returns>压缩成功标志</returns>
    public static bool ZipFile(string srcFileName, string zipFileName, ZipEnum zipEnum)
    {
      bool flag = true;
      try
      {
        switch (zipEnum)
        {
          case ZipEnum.BZIP2:

            FileStream inStream = File.OpenRead(srcFileName);
            FileStream outStream = File.Open(zipFileName, FileMode.Create);

            //参数true表示压缩完成后，inStream和outStream连接都释放
            BZip2.Compress(inStream, outStream, true, 4096);

            inStream.Close();
            outStream.Close();


            break;
          case ZipEnum.GZIP:

            FileStream srcFile = File.OpenRead(srcFileName);

            GZipOutputStream zipFile = new GZipOutputStream(File.Open(zipFileName, FileMode.Create));

            byte[] fileData = new byte[srcFile.Length];
            srcFile.Read(fileData, 0, (int)srcFile.Length);
            zipFile.Write(fileData, 0, fileData.Length);

            srcFile.Close();
            zipFile.Close();

            break;
          default: break;
        }
      }
      catch
      {
        flag = false;
      }
      return flag;
    }
    #endregion

    #region 解压缩包（单个文件解压缩）
    /// <summary>
    /// 解压缩包（单个文件解压缩）
    /// </summary>
    /// <param name="zipFileName">压缩文件</param>
    /// <param name="unzipFileName">解压缩文件</param>
    /// <param name="zipEnum">压缩算法枚举</param>
    /// <returns>压缩成功标志</returns>
    public static bool UnZipFile(string zipFileName, string unzipFileName, ZipEnum zipEnum)
    {
      bool flag = true;
      try
      {
        switch (zipEnum)
        {
          case ZipEnum.BZIP2:
            FileStream inStream = File.OpenRead(zipFileName);
            FileStream outStream = File.Open(unzipFileName, FileMode.Create);
            BZip2.Decompress(inStream, outStream, true);
            break;
          case ZipEnum.GZIP:
            GZipInputStream zipFile = new GZipInputStream(File.OpenRead(zipFileName));
            FileStream destFile = File.Open(unzipFileName, FileMode.Create);

            int bufferSize = 2048 * 2;
            byte[] fileData = new byte[bufferSize];

            while (bufferSize > 0)
            {
              bufferSize = zipFile.Read(fileData, 0, bufferSize);
              zipFile.Write(fileData, 0, bufferSize);
            }
            destFile.Close();
            zipFile.Close();
            break;
          default: break;
        }
      }
      catch
      {
        flag = false;
      }
      return flag;
    }
    #endregion

    #region 制作压缩包（多个文件压缩到一个压缩包，支持加密、注释）
    /// <summary>
    /// 制作压缩包（多个文件压缩到一个压缩包，支持加密、注释）
    /// </summary>
    /// <param name="topDirectoryName">压缩文件目录</param>
    /// <param name="zipedFileName">压缩包文件名</param>
    /// <param name="compresssionLevel">压缩级别 1-9</param>
    /// <param name="password">密码</param>
    /// <param name="comment">注释</param>
    public static void ZipFiles(string topDirectoryName, string zipedFileName, int compresssionLevel, string password, string comment)
    {
      using (ZipOutputStream zos = new ZipOutputStream(File.Open(zipedFileName, FileMode.OpenOrCreate)))
      {
        if (compresssionLevel != 0)
        {
          zos.SetLevel(compresssionLevel);//设置压缩级别
        }

        if (!string.IsNullOrEmpty(password))
        {
          zos.Password = password;//设置zip包加密密码
        }

        if (!string.IsNullOrEmpty(comment))
        {
          zos.SetComment(comment);//设置zip包的注释
        }

        //循环设置目录下所有的*.jpg文件（支持子目录搜索）
        foreach (string file in Directory.GetFiles(topDirectoryName, "*.jpg", SearchOption.AllDirectories))
        {
          if (File.Exists(file))
          {
            FileInfo item = new FileInfo(file);
            FileStream fs = File.OpenRead(item.FullName);
            byte[] buffer = new byte[fs.Length];
            fs.Read(buffer, 0, buffer.Length);

            ZipEntry entry = new ZipEntry(item.Name);
            zos.PutNextEntry(entry);
            zos.Write(buffer, 0, buffer.Length);
          }
        }
      }
    }
    #endregion

    #region 解压缩包（将压缩包解压到指定目录）
    /// <summary>
    /// 解压缩包（将压缩包解压到指定目录）
    /// </summary>
    /// <param name="zipedFileName">压缩包名称</param>
    /// <param name="unZipDirectory">解压缩目录</param>
    /// <param name="password">密码</param>
    public static void UnZipFiles(string zipedFileName, string unZipDirectory, string password)
    {
      using (ZipInputStream zis = new ZipInputStream(File.Open(zipedFileName, FileMode.OpenOrCreate)))
      {
        if (!string.IsNullOrEmpty(password))
        {
          zis.Password = password;//有加密文件的，可以设置密码解压
        }

        ZipEntry zipEntry;
        while ((zipEntry = zis.GetNextEntry()) != null)
        {
          string directoryName = Path.GetDirectoryName(unZipDirectory);
          string pathName = Path.GetDirectoryName(zipEntry.Name);
          string fileName = Path.GetFileName(zipEntry.Name);

          pathName = pathName.Replace(".", "$");
          directoryName += "\\" + pathName;

          if (!Directory.Exists(directoryName))
          {
            Directory.CreateDirectory(directoryName);
          }

          if (!string.IsNullOrEmpty(fileName))
          {
            FileStream fs = File.Create(Path.Combine(directoryName, fileName));
            int size = 2048;
            byte[] bytes = new byte[2048];
            while (true)
            {
              size = zis.Read(bytes, 0, bytes.Length);
              if (size > 0)
              {
                fs.Write(bytes, 0, size);
              }
              else
              {
                break;
              }
            }
            fs.Close();
          }
        }
      }
    }
    #endregion

ZipFileUtil.ZipFiles(@"E:\\test\\", "E:\\test.zip", 1, "admin", "this is admin's comment.");//制作压缩包 

ZipFileUtil.UnZipFiles("E:\\test.zip", "E:\\guwei4037\\", "admin");//解压缩包