winform rar压缩包解压缩

/// <summary>
        /// 解压缩
        /// </summary>
        /// <param name="path">文件解压后的存放路径（绝对）</param>
        /// <param name="rarPath">将要解压缩的 .rar 文件的存放目录路径（绝对路径）这个可以是相对路径</param>
        /// <param name="rarName">将要解压缩的 .rar 文件名（包括后缀）不需要路径,前面个参数已含此路径</param>
      public void UnRAR(string path, string rarPath, string rarName)
        {

            System.Environment.CurrentDirectory = Application.StartupPath; //当前的路径是启动路径
            bool flag = false;
            string rarexe;
            RegistryKey regkey;
            Object regvalue;
            string cmd;
            ProcessStartInfo startinfo;
            Process process;
            try
            {
                regkey = Registry.ClassesRoot.OpenSubKey(@"Applications\WinRAR.exe\shell\open\command");
                regvalue = regkey.GetValue("");
                rarexe = regvalue.ToString();
                regkey.Close();
                rarexe = rarexe.Substring(1, rarexe.Length - 7);
                System.IO.Directory.CreateDirectory(path);
                //Thread.Sleep(1000);
                //解压缩命令，相当于在要压缩文件(rarName)上点右键->WinRAR->解压到当前文件夹
                cmd = string.Format("x {0} {1} -y", rarName, path);
                startinfo = new ProcessStartInfo();
                startinfo.FileName = rarexe;
                startinfo.Arguments = cmd;
                startinfo.WindowStyle = ProcessWindowStyle.Hidden;
                System.Environment.CurrentDirectory = Application.StartupPath; //当前的路径是启动路径
                startinfo.WorkingDirectory = rarPath;
                //Thread.Sleep(1000);
                process = new Process();
                // Thread.Sleep(1000);
                process.StartInfo = startinfo;
                //  Thread.Sleep(1000);
                process.Start();
                // Thread.Sleep(1000);
                process.WaitForExit();
                if (process.HasExited)
                {
                    //flag = true;
                    File.Delete(rarPath + rarName); // 解压成功删除元文件 
                }
                else
                {
                    countnu++;
                }
                process.Close();
                listFiles(path);

            }
            catch (Exception e)
            {
                //MessageBox.Show("解压缩出现错误");
                countnu++;
            }
        }

  在解压缩过程中，如果按照上面异步下载的方法下载下来的.rar压缩包。有些文件时解压不了的，所以根据解压缩以及上一篇提到的下载，在上一篇下载中的第一种方法和本篇的解压缩才是一种完美的结合