UWP APP can share a child window in different monitor?

Question

I'm trying to show two windows on two monitors, I already checked ProjectionManager only support to sent windows (app views) to secondary displays, and swaps main and projection views. But I want to share a child window in two monitors, can I do that?

Answer 1

By testing, using ProjectionManager Class for this issue works well.

There is a simple sample to test it, you can refer to the following code. More info can be found here.

MainPage.xaml:

<Grid>
        <StackPanel Orientation="Horizontal" >
            <TextBlock Text="Today is a good day!" VerticalAlignment="Center" HorizontalAlignment="Center" FontWeight="Bold" Foreground="Red"/>
            <Frame x:Name="frame1" BorderBrush="BlueViolet" Width="900">
            </Frame>
        </StackPanel>
</Grid>

ChildWindow.xaml

  <Grid>
        <TextBlock Text="Child Window" Foreground="Blue" />
  </Grid>

MainPage.xaml.cs

  public sealed partial class MainPage : Page
    {      
        public MainPage()
        {
            this.InitializeComponent();
            frame1.Navigate(typeof(ChildWindow));
            expand();
        }
       
        private async void expand()
        {
            var NewWindow = CoreApplication.CreateNewView();
            int Windowid = ApplicationView.GetForCurrentView().Id;
            int NewWindowid = 0;

            await NewWindow.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
            {
                Frame newframe = new Frame();
                newframe.Navigate(typeof(ChildWindow), null);
                Window.Current.Content = newframe;
                Window.Current.Activate();
                ApplicationView.GetForCurrentView().Title = "New Page";

                NewWindowid = ApplicationView.GetForCurrentView().Id;
            });
            //Call ProjectionManager class for moving new window to secodary display
            bool available = ProjectionManager.ProjectionDisplayAvailable;
            ProjectionManager.ProjectionDisplayAvailableChanged += (s, e) =>
            {
                available = ProjectionManager.ProjectionDisplayAvailable;
            };
            await ProjectionManager.StartProjectingAsync(NewWindowid, Windowid);
        }
    }