UWP C＃清除第二页

在Windows 10SDK曾在自己的多个视图例如答案：https://github.com/Microsoft/Windows-universal-samples/tree/master/Samples/MultipleViews

几项修改，将有必要得到一切你的命名空间内等适当的工作

1）添加到App.cs

partial void Construct(); 
    // Hook into OnLaunched here. 
    partial void OverrideOnLaunched(LaunchActivatedEventArgs args, ref bool handled); 
    // Hook into InitializeMainPage here. 
    partial void InitializeRootFrame(Frame frame); 

2）从SDK中实现SampleConfigurations.cs类文件并更新到您的名称空间。你只需要实现class App，它实质上为class App增加了一些功能和对象，实质上它创建了一个dispatcher和一个SecondaryViews的集合供以后使用。

3）实施ViewLifetimeControls.cs为是将控制你的次要视图（其命名空间是SecondaryViewsHelpers并实现必要的用于跟踪的二级视图和关闭时破坏对象的事件和功能。

4）添加使用using SecondaryViewsHelpers;到将启动辅助视图的页面。要启动二级视图使用下面的代码：

 ViewLifetimeControl viewControl = null; 
     await CoreApplication.CreateNewView().Dispatcher.RunAsync(CoreDispatcherPriority.Normal,() => 
     { 
      // This object is used to keep track of the views and important 
      // details about the contents of those views across threads 
      // In your app, you would probably want to track information 
      // like the open document or page inside that window 
      viewControl = ViewLifetimeControl.CreateForCurrentView(); 
      viewControl.Title = ""; 
      // Increment the ref count because we just created the view and we have a reference to it     
      viewControl.StartViewInUse(); 
      var frame = new Frame(); 
      frame.Navigate(typeof(SecondaryPage), viewControl); 
      Window.Current.Content = frame; 
      // This is a change from 8.1: In order for the view to be displayed later it needs to be activated. 
      Window.Current.Activate(); 
      ApplicationView.GetForCurrentView().Title = viewControl.Title; 
      ((App)App.Current).SecondaryViews.Add(viewControl); 
     }); 
     bool viewShown = await ApplicationViewSwitcher.TryShowAsStandaloneAsync(viewControl.Id, ViewSizePreference.Default, ApplicationView.GetForCurrentView().Id, ViewSizePreference.Default); 

5）在二级页面，你就需要引用，using SecondaryViewsHelpers;并宣布以下对象/变量：

ViewLifetimeControl thisViewControl; 
    int mainViewId; 
    CoreDispatcher mainDispatcher; 

添加以下码到次级页面，上面分配的对象和注册事件

 protected override void OnNavigatedTo(NavigationEventArgs e) 
     { 
      thisViewControl = (ViewLifetimeControl)e.Parameter; 
      mainViewId = ((App)App.Current).MainViewId; 
      mainDispatcher = ((App)App.Current).MainDispatcher; 
      // When this view is finally released, clean up state 
      thisViewControl.Released += ViewLifetimeControl_Released; 
     } 
     private async void ViewLifetimeControl_Released(Object sender, EventArgs e) 
     { 
      ((ViewLifetimeControl)sender).Released -= ViewLifetimeControl_Released; 
      // The ViewLifetimeControl object is bound to UI elements on the main thread 
      // So, the object must be removed from that thread 
      await mainDispatcher.RunAsync(CoreDispatcherPriority.Normal,() => 
      { 
       ((App)App.Current).SecondaryViews.Remove(thisViewControl); 
      }); 
      // The released event is fired on the thread of the window 
      // it pertains to. 
      // 
      // It's important to make sure no work is scheduled on this thread 
      // after it starts to close (no data binding changes, no changes to 
      // XAML, creating new objects in destructors, etc.) since 
      // that will throw exceptions 
      Window.Current.Close(); 
     } 

现在关闭辅助窗口的时候，我可以看到被给予回复。我唯一担心的是，它接管了我将数据发送到新创建视图的参数。我必须找到一种解决方法将信息传递到辅助页面 - 可能暂时使用标题。