How to open Page on Startup, which will than be recognized by OnNavigatedTo in ViewModel

[anzeko123]

Hi,
I am currently trying to open a page when you start the application (yes it opens without this). I need to open it so I can use OnNavigatedTo method in a ViewModel so I can initialize my local database.
I am curently migrating from Xamarin.Forms to .NET MAUI.
In Xamarin.Forms u write the initialization in App.xaml.cs in the OnInitialized method.
This is the code in Xamarin.Forms:

        protected override async void OnInitialized()
        {
            InitializeComponent();
            await NavigationService.NavigateAsync(new Uri("http://url.com/SignInPage", UriKind.Absolute),
                new NavigationParameters
                {
                    {"OnSuccess",new Uri("http://url.com/SignInPage?IsNew=true", UriKind.Absolute) }
                });
        }

I looked through the whole documentation on Navigation in Prism but I couldn't figure out how to make this navigation. In .NET MAUI you don't have the OnInitialized method and I think that you can make this navigation in the App.xaml.cs in .NET MAUI.
Is there a way to do this in the same way as you did in Xamarin.Forms.
I tried to create this navigation builder for .NET MAUI but i don't understand it correctly how to set it up and how it works.
I also tried making INavigationService as a variable but I get the error for Object reference not set to an instance of an object because I don't populate the NavigationService

public partial class App : Application {
    public App() {
        //public INavigationService NavigationService { get; set; }
        InitializeComponent();
        MainPage = new AppShell();
        NavigationService.NavigateAsync(new Uri("http://url.com/SignInPage", UriKind.Absolute),
            new NavigationParameters
            {
                    {"OnSuccess",new Uri("http://url.com/SignInPage?IsNew=true", UriKind.Absolute) }
            });
    }
}

After the page navigates I want to be recognized by OnNavigatedTo.

Thank you to everyone who tries to help
Anzeko

[dansiegel]

OnInitialized does still exist though it is the improper place to Navigate in .NET MAUI. You will want to use OnAppStart which is clearly documented here and is used the in repo test app.

Prism/e2e/Maui/PrismMauiDemo/MauiProgram.cs

Lines 53 to 55 in 7c69cfc

	.OnAppStart(navigationService => navigationService.CreateBuilder()
	.AddSegment<SplashPageViewModel>()
	.NavigateAsync(HandleNavigationError))

[anzeko123]

Thank you. This works and it properly navigates. Still it does not open the OnNavigatedTo but I thing there is a problem somewhere else.