WPFの多屏幕问题

        public MainWindow(string sysName, int timeState)
        {
            InitializeComponent();
            //查找当前屏幕数量
            if (System.Windows.Forms.Screen.AllScreens.Count() >= )
            {
                Dispatcher.Invoke(
                    () =>
                    {
                        try
                        {
                            NewWindow win= new NewWindow();
                            win.Show();
                        }
                        catch (Exception ex)
                        {
                            MessageBox.Show(ex.Message);
                        }
                    }
                    );
            }

        }