Semi.Avalonia/demo/Semi.Avalonia.Demo.Drm/App.axaml.cs

using Avalonia;
using Avalonia.Controls.ApplicationLifetimes;
using Avalonia.Markup.Xaml;
using Semi.Avalonia.Demo.Views;

namespace Semi.Avalonia.Demo.Drm
{
    public partial class App : Application
    {
        public override void Initialize()
        {
            AvaloniaXamlLoader.Load(this);
        }

        public override void OnFrameworkInitializationCompleted()
        {
            if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
                desktop.MainWindow = new MainWindow();
            else if (ApplicationLifetime is ISingleViewApplicationLifetime singleView)
                singleView.MainView = new MainView();
            base.OnFrameworkInitializationCompleted();
        }
    }
}