c#判断你打开的应用程序是否以打开

private static   void GetSingleThread()
   {          
    string name = Process.GetCurrentProcess().ProcessName;
    int id = Process.GetCurrentProcess().Id;
    Process[] prc = Process.GetProcesses();
    foreach(Process pr in prc)
    {
     if ((name == pr.ProcessName) && (pr.Id != id))
     {      
      MessageBox.Show("对不起,本地已经有系统正在运行!/n.","提示",MessageBoxButtons.OK,MessageBoxIcon.Warning);
      System.Environment.Exit(0);
     }
    }