WPF 控制程序只能启动一次

public partial class App : Application
     {
         System.Threading.Mutex mutex;        public App()
         {
             this.Startup += new StartupEventHandler(App_Startup);
         }        void App_Startup(object sender, StartupEventArgs e)
         {
             bool ret;
             mutex = new System.Threading.Mutex(true, "WpfMuerterrrterterttex", out ret);
             if (!ret)
             {
                 MessageBox.Show("Program has started, you can't start again!");
                 Environment.Exit(0);
             }
         }
     }

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