Review der Codebase

LehrerApp.Desktop/App.axaml.cs

@@ -15,6 +15,8 @@ namespace LehrerApp.Desktop;
 public class App : Application
 {
     public static IServiceProvider Services { get; private set; } = null!;
+    private static ServiceProvider? _serviceProvider;
+    private static bool _exitHandlerAttached;
 
     public override void Initialize() => AvaloniaXamlLoader.Load(this);
 
@@ -32,31 +34,58 @@ public class App : Application
                 promptVm.OnUnlocked = password =>
                 {
                     AppBootstrapper.DbPassword = password;
-                    StartMainApp(desktop);
+                    StartMainApp(desktop, showImmediately: true);
                     promptWindow.Close();
                 };
                 desktop.MainWindow = promptWindow;
             }
             else
             {
-                StartMainApp(desktop);
+                StartMainApp(desktop, showImmediately: false);
             }
         }
 
         base.OnFrameworkInitializationCompleted();
     }
 
-    private static void StartMainApp(IClassicDesktopStyleApplicationLifetime desktop)
+    private static void StartMainApp(
+        IClassicDesktopStyleApplicationLifetime desktop, bool showImmediately)
     {
-        Services = AppBootstrapper.BuildServices();
+        _serviceProvider = AppBootstrapper.BuildServices();
+        Services = _serviceProvider;
         Services.GetRequiredService<AppLogger>().Info("Anwendung gestartet.");
         GlobalExceptionHandler.AttachNotifications(Services.GetRequiredService<NotificationService>());
 
+        if (!_exitHandlerAttached)
+        {
+            desktop.Exit += (_, _) => DisposeServices();
+            _exitHandlerAttached = true;
+        }
+
         var mainVm = Services.GetRequiredService<MainWindowViewModel>();
         WireCallbacks(mainVm);
         var main = new MainWindow { DataContext = mainVm };
         desktop.MainWindow = main;
-        main.Show();
+        if (showImmediately) main.Show();
+    }
+
+    private static void DisposeServices()
+    {
+        if (_serviceProvider is null) return;
+
+        try
+        {
+            _serviceProvider.GetService<LiteDbContext>()?.Checkpoint();
+        }
+        catch (Exception ex)
+        {
+            AppBootstrapper.Logger.Error("Datenbank-Checkpoint beim Beenden fehlgeschlagen.", ex);
+        }
+        finally
+        {
+            _serviceProvider.Dispose();
+            _serviceProvider = null;
+        }
     }
 
     private static void WireCallbacks(MainWindowViewModel main)