public void RARsave(string rarPatch, string rarFiles,string  patch,string rarName)
        {
            String the_rar;
            RegistryKey the_Reg;
            Object the_Obj;
            String the_Info;
            ProcessStartInfo the_StartInfo;
            Process the_Process;
            try
            {
                the_Reg = Registry.ClassesRoot.OpenSubKey(@"Applications\\WinRAR.exe\\Shell\\Open\\Command");
                the_Obj = the_Reg.GetValue("");
                the_rar = the_Obj.ToString();
                the_Reg.Close();
                the_rar = the_rar.Substring(1, the_rar.Length - 7);
                if (!Directory.Exists(patch))
                Directory.CreateDirectory(patch);
                //命令參數

                //the_Info = " a  c:\\test.rar a.txt -r"; //文件壓縮

                the_Info = string.Format(" a -df {0}\\{1}  {2}  -r", patch, rarName, rarFiles);// " a " + rarName + " " + patch;
                the_StartInfo = new ProcessStartInfo();
                the_StartInfo.FileName = the_rar;
                the_StartInfo.Arguments = the_Info;
                the_StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
                //打包文件存放目錄

                the_StartInfo.WorkingDirectory = rarPatch;
                the_Process = new Process();
                the_Process.StartInfo = the_StartInfo;
                the_Process.Start();
                the_Process.WaitForExit();
                the_Process.Close();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        public string unRAR(string rarPath, string rarName, string unRarPath)
        {
            String the_rar;
            RegistryKey the_Reg;
            Object the_Obj;
            String the_Info;
            ProcessStartInfo the_StartInfo;
            Process the_Process;
            try
            {
                the_Reg = Registry.ClassesRoot.OpenSubKey(@"Applications\\WinRAR.exe\\Shell\\Open\\Command");
                the_Obj = the_Reg.GetValue("");
                the_rar = the_Obj.ToString();
                the_Reg.Close();
                the_rar = the_rar.Substring(1, the_rar.Length - 7);
                if (!Directory.Exists(unRarPath + "\\" + rarName.Substring(0, rarName.LastIndexOf(".")-1)))
                    Directory.CreateDirectory(unRarPath + "\\" + rarName.Substring(0, rarName.LastIndexOf(".")-1));
                the_Info = string.Format("x {0} {1}\\{2} -y", rarName, unRarPath, rarName.Substring(0, rarName.LastIndexOf(".")-1));
                the_StartInfo = new ProcessStartInfo();
                the_StartInfo.FileName = the_rar;
                the_StartInfo.Arguments = the_Info;
                the_StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
                the_StartInfo.WorkingDirectory = rarPath;//獲取壓縮包路徑

                the_Process = new Process();
                the_Process.StartInfo = the_StartInfo;
                the_Process.Start();
                the_Process.WaitForExit();
                the_Process.Close();
            }
            catch (Exception ex)
            {
                throw ex;
            }
            return "";//Server.MapPath(unRarPatch);
        }
        public string unRAR(string rarPath, string rarName, string unRarPath, string unRarPathName)
        {
            String the_rar;
            RegistryKey the_Reg;
            Object the_Obj;
            String the_Info;
            ProcessStartInfo the_StartInfo;
            Process the_Process;
            try
            {
                the_Reg = Registry.ClassesRoot.OpenSubKey(@"Applications\\WinRAR.exe\\Shell\\Open\\Command");
                the_Obj = the_Reg.GetValue("");
                the_rar = the_Obj.ToString();
                the_Reg.Close();
                the_rar = the_rar.Substring(1, the_rar.Length - 7);
                //if (!Directory.Exists(unRarPath + "\\" + unRarPathName))
                //    Directory.CreateDirectory(unRarPath + "\\" + unRarPathName);
                //the_Info = string.Format("x {0} {1}\\{2} -y", rarName, unRarPath, unRarPathName);

                if (!Directory.Exists(unRarPath ))
                    Directory.CreateDirectory(unRarPath);
                the_Info = string.Format("x {0} {1} -y", rarName, unRarPath);
                the_StartInfo = new ProcessStartInfo();
                the_StartInfo.FileName = the_rar;
                the_StartInfo.Arguments = the_Info;
                the_StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
                the_StartInfo.WorkingDirectory = rarPath;//獲取壓縮包路徑

                the_Process = new Process();
                the_Process.StartInfo = the_StartInfo;
                the_Process.Start();
                the_Process.WaitForExit();
                the_Process.Close();
            }
            catch (Exception ex)
            {
                throw ex;
            }
            return "";//Server.MapPath(unRarPatch);
        }

RARsave("c:\\emrbs", "1.txt 2.txt", "c:\\test", "test.rar");

unRAR("d:\\","f.rar","d:\\ftest");