Net6_03.cs

public class Application : MauiApp
{
    public override IAppHostBuilder CreateBuilder() => 
        base.CreateBuilder()
            .RegisterCompatibilityRenderers()
            .ConfigureServices((ctx, services) =>
            {
                services.AddTransient<MainPage>();
                services.AddTransient<IWindow, MainWindow>();
            })
            .ConfigureFonts((hostingContext, fonts) =>
            {
                fonts.AddFont("ionicons.ttf", "IonIcons");
            });

    public override IWindow CreateWindow(IActivationState state)
    {
        Microsoft.Maui.Controls.Compatibility.Forms.Init(state);
        return Services.GetService<IWindow>();
    }
}