ASP.net C# 在线压缩、解压zip（支持子文件夹）

控件：ICSharpCode.SharpZipLib.dll

代码：

.....

using ICSharpCode.SharpZipLib.Zip;

.....

    /// <summary>压缩文件</summary>
    /// <param name="filename">filename生成的文件的名称，如：C\123\123.zip</param>
    /// <param name="directory">directory要压缩的文件夹路径</param>
    /// <returns></returns>
    public static bool PackFiles(string filename, string directory)
    {
        try
        {

            directory = directory.Replace("/", "\\");

            if (!directory.EndsWith("\\"))
                directory += "\\";
            if (!Directory.Exists(directory))
            {
                Directory.CreateDirectory(directory);
            }
            if (File.Exists(filename))
            {
                File.Delete(filename);
            }

            FastZip fz = new FastZip();
            fz.CreateEmptyDirectories = true;
            fz.CreateZip(filename, directory, true, "");
            return true;
        }
        catch (Exception)
        {
            return false;
        }       
    }

  /// <summary>解压文件</summary>
    /// <param name="file">压缩文件的名称，如：C:\123\123.zip</param>
    /// <param name="dir">dir要解压的文件夹路径</param>
    /// <returns></returns>
    public static bool UnpackFiles(string file, string dir)
    {
        try
        {
            if (!File.Exists(file))
                return false;

            dir=dir.Replace("/","\\");
            if (!dir.EndsWith("\\"))
                dir += "\\";      

           if (!Directory.Exists(dir))
                Directory.CreateDirectory(dir);

            ZipInputStream s = new ZipInputStream(File.OpenRead(file));
            ZipEntry theEntry;
            while ((theEntry = s.GetNextEntry()) != null)
            {

                string directoryName = Path.GetDirectoryName(theEntry.Name);
                string fileName = Path.GetFileName(theEntry.Name);

                if (directoryName != String.Empty)
                    Directory.CreateDirectory(dir + directoryName);

                if (fileName != String.Empty)
                {
                    FileStream streamWriter = File.Create(dir + 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();            return true;        }        catch (Exception)        {            return false;        }    }