WP8.1 windows phone 8.1 二次退出

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public MainPage(){HardwareButtons.BackPressed += HardwareButtons_BackPressed; //註冊後退鍵}private void HardwareButtons_BackPressed(object sender, Windows.Phone.UI.Input.BackPressedEventArgs e){Frame frame = Window.Current.Content as Frame;if(frame==null){return;}if(frame.CanGoBack){frame.GoBack();e.Handled = true;  //正常頁面的推出}else{Back_Key++;//記錄器
if (Back_Key == 1){Main_Pivot.Opacity = 0.5;Back_Text.Visibility = Visibility.Visible;Back_Border.Visibility = Visibility.Visible;Main_Pivot.IsEnabled = false;

DT = new DispatcherTimer();//計時器
DT.Interval = new TimeSpan(0, 0, 1)；

DT.Start();DT.Tick += DT_Tick;e.Handled = true;}else{App.Current.Exit();//完全退出}}}

WP8.1 windows phone 8.1 二次退出