Initial

LehrerApp.Desktop/App.axaml.cs

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+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Markup.Xaml;
+using LehrerApp.Desktop.ViewModels;
+using LehrerApp.Desktop.Views;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace LehrerApp.Desktop;
+
+public class App : Application
+{
+    public static IServiceProvider Services { get; private set; } = null!;
+
+    public override void Initialize()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+
+    public override void OnFrameworkInitializationCompleted()
+    {
+        Services = AppBootstrapper.BuildServices();
+
+        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+        {
+            desktop.MainWindow = new MainWindow
+            {
+                DataContext = Services.GetRequiredService<MainWindowViewModel>(),
+            };
+        }
+
+        base.OnFrameworkInitializationCompleted();
+    }
+}