DeviceDisplay.Current.MainDisplayInfo not working

[mouralabank]

Description

The displayInfo does not provide any information about the display on the App construction

If I add the same code on the event OnCounterClicked then it works.

Steps to Reproduce

Create a Maui Application and add the following in App.xaml.cs:

namespace TestWindow;

public partial class App : Application
{
	public App()
	{
		InitializeComponent();

		MainPage = new AppShell();
	}
    protected override Window CreateWindow(IActivationState activationState)
    {
        Window window = base.CreateWindow(activationState);

        // get screen size
        var disp = DeviceDisplay.Current.MainDisplayInfo;

        // get width and height
        var newWidth = disp.Width/2;
        var newHeight = disp.Height/2;

        // center the window
        window.X = (disp.Width / disp.Density - newWidth) / 2;
        window.Y = (disp.Height / disp.Density - newHeight) / 2;

        // resize
        window.Width = newWidth;
        window.Height = newHeight;
        return window;
    }
}

Link to public reproduction project repository

https://github.com/dotnet/maui/blob/main/.github/repro.md

Version with bug

7.0 (current)

Last version that worked well

Unknown/Other

Affected platforms

Windows

Affected platform versions

windows10.0.19041.0

Did you find any workaround?

No

Relevant log output

No response

[ghost]

Hi @mouralabank. We have added the "s/needs-repro" label to this issue, which indicates that we require steps and sample code to reproduce the issue before we can take further action. Please try to create a minimal sample project/solution or code samples which reproduce the issue, ideally as a GitHub repo that we can clone. See more details about creating repros here: https://github.com/dotnet/maui/blob/main/.github/repro.md

This issue will be closed automatically in 7 days if we do not hear back from you by then - please feel free to re-open it if you come back to this issue after that time.

[ghost]

This issue has been automatically marked as stale because it has been marked as requiring author feedback to reproduce the issue but has not had any activity for 4 days. It will be closed if no further activity occurs within 3 days of this comment. If it is closed, feel free to comment when you are able to provide the additional information and we will re-investigate.

[tonydokun]

This ist a duplicate of #6976. @mouralabank the workaround is to use:

DeviceDisplay.MainDisplayInfoChanged += DeviceDisplay_MainDisplayInfoChanged;

and then use something like this:

 private void DeviceDisplay_MainDisplayInfoChanged(object? sender, DisplayInfoChangedEventArgs e)
    {
        MyMainDisplay = DeviceDisplay.Current.MainDisplayInfo;
        NotifyPropertyChanged(nameof(MyMainDisplay );
    }

[ghost]

Hello lovely human, thank you for your comment on this issue. Because this issue has been closed for a period of time, please strongly consider opening a new issue linking to this issue instead to ensure better visibility of your comment. Thank you!