Windows phone 8.1 Windows Phone、Prism.StoreApps：如何避免在暂停或终止后激活特定页面？

我确实希望确保，如果某个应用程序被导航到某个页面，则该应用程序在挂起或终止后的上一个页面上位于另一个页面上。就我而言，这个页面是用来拍照的。我不希望用户在应用程序处于后台后返回此页面，因为它没有上下文信息。上下文信息在previuos页面上

我如何使用Prism.StoreApps实现这一点

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背景：如果应用程序刚刚挂起，则应用程序的状态在恢复后保持不变，因此最后一个活动页面再次处于活动状态。在这种情况下，我真的不知道如何设置另一个页面处于活动状态。如果应用程序被终止，Prim.StoreApps将恢复导航状态并导航到最后一个活动视图模型，从而导航到最后一个活动页面。在这种情况下，我也不知道如何更改导航状态，以便导航到另一个页面。

与此同时，我自己也喜欢一个工作解决方案。可能不是最好的，也可能有更好的解决方案，但它是有效的

对于恢复应用程序，我将处理恢复事件：

对于终止后的页面还原，我首先使用App类中的一个属性：

private void OnResuming(object sender, object o)
{
   // Check if the current root frame contains the page we do not want to 
   // be activated after a resume
   var rootFrame = Window.Current.Content as Frame;
   if (rootFrame != null && rootFrame.CurrentSourcePageType == typeof (NotToBeResumedOnPage))
   {
      // In case the page we don't want to be activated after a resume would be activated:
      // Go back to the previous page (or optionally to another page)
      this.NavigationService.GoBack();
   }
}

public bool MustPreventNavigationToPageNotToBeResumedOn { get; set; }

public App()
{
    this.InitializeComponent();

    // We assume that the app was restored from termination and therefore we must prevent navigation 
    // to the page that should not be navigated to after suspension and termination. 
    // In OnLaunchApplicationAsync MustPreventNavigationToPageNotToBeResumedOn is set to false since 
    // OnLaunchApplicationAsync is not invoked when the app was restored from termination.
    this.MustPreventNavigationToPageNotToBeResumedOn = true; 

    this.Resuming += this.OnResuming;
}

protected override Task OnLaunchApplicationAsync(LaunchActivatedEventArgs args)
{
   // If the application is launched normally we do not prevent navigation to the
   // page that should not be navigated to.
   this.MustPreventNavigationToPageNotToBeResumedOn = false;

   this.NavigationService.Navigate("Main", null);

   return Task.FromResult<object>(null);
}

public override void OnNavigatedTo(object navigationParameter, NavigationMode navigationMode, 
   Dictionary<string, object> viewModelState)
{
   if (((App)Application.Current).MustPreventNavigationToPageNotToBeResumedOn)
   {
      // If must prevent navigation to this page (that should not be navigated to after 
      // suspension and termination) we reset the marker and just go back. 
      ((App)Application.Current).MustPreventNavigationToPageNotToBeResumedOn = false;
      this.navigationService.GoBack();
   }
   else
   {
      base.OnNavigatedTo(navigationParameter, navigationMode, viewModelState);
   }
}