WPF 设置只能运行一个实例

        public bool SignalExternalCommandLineArgs(IList<string> args)
        {
            Window curWindow = this.Windows.FindFirst() as Window;
            if (null != curWindow)
            {
                curWindow.WindowState = WindowState.Minimized;
                curWindow.WindowState = WindowState.Normal;
                curWindow.Activate();
            }
            return true;
        }