static class SingleInstanceApplication
    {
        [DllImport("kernel32.dll", SetLastError = true)]
        public static extern IntPtr CreateMutex(IntPtr Attr, bool Own, string Name);

        [DllImport("kernel32.dll", SetLastError = true)]
        public static extern bool ReleaseMutex(IntPtr hMutex);

        [DllImport(
 
"user32.dll")]
        public static extern void SwitchToThisWindow(IntPtr hWnd, bool fAltTab);

        const long ERROR_ALREADY_EXISTS = 183;
        public static void Run(Form frm)
        {
            string name = "SENSE_C2000";
            IntPtr mutexHandle = CreateMutex(IntPtr.Zero, true, name);
            
 
long error = Marshal.GetLastWin32Error();

            string pName = "SENSE-C2000";//要啟動的進程名稱，可以在任務管理器裏查看，一般是不帶.exe後綴的;  
            Process[] temp = Process.GetProcessesByName(pName);//在所有已啟動的進程中查找需要的進程；  
            if (error != ERROR_ALREADY_EXISTS)
            {
                Application.Run(frm);
            }
            
 
else
            {
                SwitchToThisWindow(temp[0].MainWindowHandle, true); // 激活，顯示在最前  
                //MessageBox.Show("您的程序已經在運行了,不能同時運行兩個實例!", "The Application has been running!");
                LogHlep.WriteLog("重復登錄");
            }
            ReleaseMutex(mutexHandle);
        }
    }
    static class Program
    {
        /// <summary>
        /// 應用程序的主入口點。
        /// </summary>
        [STAThread]
        static void Main(string[] args = null)
        {
　　　　　　  //全局異常捕捉
            Application.ThreadException += Application_ThreadException; //UI線程異常
            AppDomain.CurrentDomain.UnhandledException += CurrentDomain_UnhandledException; //多線程異常
            //args = new string[2];
　　　　　　  //args[0] = "10001";
            //if (args == null)
            //{
            //    args = new string[2];
            //    args[0] = "18231132";
            //}
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            //Application.Run(new FrmMain(args));
            SingleInstanceApplication.Run(new FrmMain(args));
        }
      　//UI線程異常
        static void Application_ThreadException(object sender, System.Threading.ThreadExceptionEventArgs e)
        {
            //WinformException.FrmBugReport.ShowBug(e.Exception);
            LogHlep.WriteLog("異常詳細信息：" + e.Exception.Message + "\r\n跟蹤：" + e.Exception.StackTrace);
        }

        //多線程異常
        static void CurrentDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e)
        {
            //WinformException.FrmBugReport.ShowBug((Exception)e.ExceptionObject);
            Exception ex = (Exception)e.ExceptionObject;
            LogHlep.WriteLog("異常詳細信息：" + ex.Message + "\r\n跟蹤：" + ex.StackTrace);
        }

全局異常跟只能開啟一次程序，打開第二次將把該程序顯示最前