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        private void dlZipDir()//string strPath, string strFileName)
        {
            string strPath = @"C:\Documents and Settings\wuy\桌面";

            String strBaseDir = "";
            //MemoryStream ms = null;
            //ms = new MemoryStream();
            //zos = new ZipOutputStream(ms);
            zos = new ZipOutputStream(File.Create(outname));
            strBaseDir = strPath + "\\";
            addZipEntry(strBaseDir);
            zos.Finish();
            zos.Close();
        }
        private void addZipEntry(string PathStr)
        {
            DirectoryInfo di = new DirectoryInfo(PathStr);
            foreach (DirectoryInfo item in di.GetDirectories())
            {
                addZipEntry(item.FullName);
            }
            foreach (FileInfo item in di.GetFiles())
            {
                FileStream fs = File.OpenRead(item.FullName);
                byte[] buffer = new byte[fs.Length];
                fs.Read(buffer, 0, buffer.Length);
                string strEntryName = item.FullName.Replace("aa", "");
                ZipEntry entry = new ZipEntry(strEntryName);
                zos.PutNextEntry(entry);
                zos.Write(buffer, 0, buffer.Length);
                fs.Close();
            }
        }