Question

I am trying to create a WPF presentation application where the Primary Window on the Primary Screen will be used to update the content on the Presentation Window, which needs to be on the secondary screen. I am looking for samples or code snippet that can help me do that.

Also I have attempted the following and doesn’t work:

protected override void OnStartup(StartupEventArgs e)
        {
            base.OnStartup(e);

            var screens = System.Windows.Forms.Screen.AllScreens;
            if (screens.Length > 1)
            {
                var window = new MainWindow
                {
                    WindowStartupLocation = WindowStartupLocation.Manual,
                    WindowState = WindowState.Maximized,

                    Top = screens[0].WorkingArea.Top,
                    Left = screens[0].WorkingArea.Left,
                    Topmost = true
                };
                window.Show();

                var pesentationWindow = new PresentationWindow
                {
                    WindowStartupLocation = WindowStartupLocation.Manual,
                    ShowInTaskbar = false,
                    Top = screens[1].WorkingArea.Top,
                    Left = screens[1].WorkingArea.Left,
                    Topmost = true
                };
                pesentationWindow.Show();
            }
        }

Answer 1

You can use Screen object in this way

protected override void OnStartup(StartupEventArgs e)
{
    base.OnStartup(e);

    Window1 w1 = new Window1();
    Window2 w2 = new Window2();


    Screen s1 = Screen.AllScreens[0];
    Screen s2 = Screen.AllScreens[1];

    Rectangle r1 = s1.WorkingArea;
    Rectangle r2 = s2.WorkingArea;

    w1.Top = r1.Top;
    w1.Left = r1.Left;

    w2.Top = r2.Top;
    w2.Left = r2.Left;

    w1.Show();
    w2.Show();

    w2.Owner = w1;


}

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