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();
            }
        }
    }
}