Bing地圖 - 後退按鈕 - 無法返回到我的應用程序WP8

Question

當我按下後退按鈕關閉bing地圖應用程序並返回到應用程序時，bing地圖一次又一次打開，無法關閉它們。如何解決這個問題？（我爲Windows phone的8）

protected override void OnNavigatedTo(NavigationEventArgs e) 
    { 
     base.OnNavigatedTo(e); 

     if (NavigationContext.QueryString.TryGetValue("itineraire", out itineraire)) 
     { 

      // You can specify a label and a geocoordinate for the end point. 
      GeoCoordinate spaceNeedleLocation = App.Sitegeolocalisation; 
      LabeledMapLocation spaceNeedleLML = new LabeledMapLocation(App.leSite.SiteName, spaceNeedleLocation); 

      // If you set the geocoordinate parameter to null, the label parameter is used as a search term. 
      MapsDirectionsTask mapsDirectionsTask = new MapsDirectionsTask(); 

      mapsDirectionsTask.End = spaceNeedleLML; 

      // If mapsDirectionsTask.Start is not set, the user's current location is used as the start point. 

      mapsDirectionsTask.Show(); 


     } 
     else 
     { 
      MapsTask mapsTask = new MapsTask(); 

      mapsTask.ZoomLevel = 17; 
      //Omit the Center property to use the user's current location. 
      mapsTask.Center = App.Sitegeolocalisation; 

      mapsTask.Show(); 


     } 
    } 

Answer 1

可以在NavigationEventArgs測試性能NavigationMode，如果NavigationMode又回來了，就跳過你對的OnNavigatedTo方法現在的代碼。