如何在其他设备上通过GPIController任务返回主页及指定代码放置位置咨询

Hey there! Let's tackle your two questions with clear, actionable answers:

Assuming you're working with a UWP (or similar XAML-based) app, here's how you can navigate back to the home page after your GPIController task finishes:

• First, get a reference to your app's root navigation frame—this is usually set up in your app's startup code, and you can access it like this:

  var rootFrame = Window.Current.Content as Frame;
  

• When your GPIController task completes (whether successfully or with a trigger to return home), call the navigation method to jump to your home page. You have two options here:
  • Direct navigation: If you want to go straight to the home page regardless of the navigation stack, use:

    rootFrame.Navigate(typeof(HomePage));
    

  • Go back via stack: If the home page is the previous entry in the navigation stack, you can use this instead (but make sure to check if going back is possible first):

    if (rootFrame.CanGoBack)
    {
        rootFrame.GoBack();
    }
    

• Important note: If your GPIController task runs asynchronously (off the UI thread), you need to dispatch the navigation call back to the UI thread. Use the dispatcher for this:

  await Application.Current.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
  {
      var rootFrame = Window.Current.Content as Frame;
      rootFrame.Navigate(typeof(HomePage));
  });
  

Let's break down these two lines separately, since they belong in different places:

NavigationCacheMode = NavigationCacheMode.Required; #

This property controls whether the target page is cached (so it retains its state when navigated away from and back). You need to set this on the page you're navigating to (not the current page):

• Option 1: Page constructor (code-behind)
  Open the code-behind file for OtherPage and add this line in the constructor:

  public OtherPage()
  {
      this.InitializeComponent();
      this.NavigationCacheMode = NavigationCacheMode.Required;
  }
  

• Option 2: XAML markup
  You can also set it directly in the XAML of OtherPage for a cleaner separation:

  <Page x:Class="YourAppNamespace.OtherPage"
        NavigationCacheMode="Required">
      <!-- Your page content goes here -->
  </Page>
  

Frame.navigate(typeof(otherpage)); #

This line triggers the navigation to OtherPage, so it belongs wherever you want to initiate the navigation—like:

• A button click event handler in your current page's code-behind:

  private void NavigateToOtherPageBtn_Click(object sender, RoutedEventArgs e)
  {
      Frame.Navigate(typeof(OtherPage));
  }
  

• A command in your view model (if you're using MVVM):

  public ICommand GoToOtherPageCommand => new RelayCommand(() =>
  {
      // Get the frame from your view or service
      var currentFrame = (Frame)Window.Current.Content;
      currentFrame.Navigate(typeof(OtherPage));
  });
  

内容的提问来源于stack exchange，提问作者Bulent Erim