XAML-Map-Control/SampleApps/UniversalApp/App.xaml.cs

using Windows.ApplicationModel.Activation;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;

namespace SampleApplication;

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

    protected override void OnLaunched(LaunchActivatedEventArgs e)
    {
        if (Window.Current.Content is not Frame rootFrame)
        {
            rootFrame = new Frame();

            Window.Current.Content = rootFrame;
        }

        if (e.PrelaunchActivated == false)
        {
            if (rootFrame.Content == null)
            {
                rootFrame.Navigate(typeof(MainPage), e.Arguments);
            }

            Window.Current.Activate();
        }
    }
}