App: Add ShutdownNow() and ShutdownGracefully()

Elwig/App.xaml.cs

@@ -18,12 +18,13 @@ using System.Reflection;
 using System.Text;
 using System.Threading.Tasks;
 using System.Windows;
+using System.Windows.Input;
 using System.Windows.Threading;
 
 namespace Elwig {
     public partial class App : Application {
 
-        protected static App CurrentApp;
+        public static App CurrentApp;
         public static int NumWindows => CurrentApp.Windows.Count;
         public static bool ForceShutdown { get; set; } = false;
 
@@ -102,7 +103,7 @@ namespace Elwig {
                 InteractionService.ShowException("Fehlerhafte Datenbank", "Schwerwiegender Fehler in der Datenbank, unbedingt den Programmierern melden!", exc);
                 if (InteractionService.AskQuestion("Backup wiederherstellen", "Soll die Datenbank aus einem Backup wiederhergestellt werden?\n\nAchtung: Das kann zu Datenverlust führen!", false))
                     await BackupService.RestoreDatabase();
-                Shutdown();
+                ShutdownNow();
                 return;
             }
 
@@ -119,7 +120,7 @@ namespace Elwig {
                     InteractionService.ShowException("Fehler", "Fehler beim Laden der Mandantendaten, unbedingt den Programmierern melden!", exc);
                     if (InteractionService.AskQuestion("Backup wiederherstellen", "Soll die Datenbank aus einem Backup wiederhergestellt werden?\n\nAchtung: Das kann zu Datenverlust führen!", false))
                         await BackupService.RestoreDatabase();
-                    Shutdown();
+                    ShutdownNow();
                     return;
                 }
                 BranchNum = branches.Count;
@@ -183,7 +184,7 @@ namespace Elwig {
             if (Config.Branch != null) {
                 if (!branches.ContainsKey(Config.Branch.ToLower())) {
                     InteractionService.ShowError("Ungültige Zweigstelle", "Ungültige Zweigstelle in Konfigurationsdatei!");
-                    Shutdown();
+                    ShutdownNow();
                 } else {
                     SetBranch(branches[Config.Branch.ToLower()]);
                 }
@@ -191,7 +192,7 @@ namespace Elwig {
                 SetBranch(branches.First().Value);
             } else {
                 InteractionService.ShowError("Ungültige Zweigstelle", "Erkennen der lokalen Zweigstelle nicht möglich!");
-                Shutdown();
+                ShutdownNow();
             }
 
             if (Config.WeighingMode == null) {
@@ -210,21 +211,27 @@ namespace Elwig {
             window.Show();
         }
 
-        public async Task OnClosing() {
+        public static void ShutdownNow() {
+            ForceShutdown = true;
+            Current.Shutdown();
+        }
+
+        public async void ShutdownGracefully() {
+            Mouse.OverrideCursor = Cursors.AppStarting;
+
             try {
                 await BackupService.TryDatabaseBackup();
             } catch (Exception exc) {
                 InteractionService.ShowException("Automatisches Backup", exc);
             }
-        }
 
-        protected override void OnExit(ExitEventArgs evt) {
             SerialPortWatcher.Dispose();
             foreach (var s in EventScales) {
                 s.Dispose();
             }
             Pdf.Cleanup();
-            base.OnExit(evt);
+
+            Shutdown();
         }
 
         public static void SetBranch(Branch b) {
@@ -335,8 +342,7 @@ namespace Elwig {
                 await MainDispatcher.BeginInvoke(() => {
                     var d = new UpdateDialog(latest.Value.Version, latest.Value.Url, latest.Value.Size);
                     if (d.ShowDialog() == true) {
-                        ForceShutdown = true;
-                        Current.Shutdown();
+                        ShutdownNow();
                     }
                 });
             } else if (showAlert) {
@@ -354,8 +360,7 @@ namespace Elwig {
                     await Database.Import(filename);
                 });
                 InteractionService.ShowInformation("Datenbank ersetzen", "Das Ersetzen war erfolgreich!\n\nBitte starten Sie Elwig neu!");
-                ForceShutdown = true;
-                Current.Shutdown();
+                ShutdownNow();
             } catch (Exception exc) {
                 InteractionService.ShowException("Datenbank ersetzen", "Fehler beim Ersetzen", exc);
             }

Elwig/Windows/AdministrationWindow.cs

@@ -108,12 +108,20 @@ namespace Elwig.Windows {
             LockInputs();
         }
 
+        public void TryClose() {
+            var evt = new CancelEventArgs();
+            OnClosing(this, evt);
+            if (!evt.Cancel) Close();
+        }
+
         private void OnClosing(object? sender, CancelEventArgs evt) {
-            if ((IsCreating || IsEditing) && HasChanged) {
+            if (!IsClosing && (IsCreating || IsEditing) && HasChanged) {
+                try {
                     if (!InteractionService.AskConfirmation("Schließen bestätigen", "Soll das Fenster wirklich geschlossen werden?")) {
                         evt.Cancel = true;
                         return;
                     }
+                } catch { }
             }
             IsClosing = true;
         }

Elwig/Windows/MainWindow.xaml.cs

@@ -50,27 +50,23 @@ namespace Elwig.Windows {
             _syncTimer.Start();
         }
 
-        private async void Window_Closing(object sender, CancelEventArgs evt) {
-            evt.Cancel = !App.ForceShutdown;
-
+        private void Window_Closing(object sender, CancelEventArgs evt) {
             if (App.NumWindows > 1 && !App.ForceShutdown) {
-                foreach (var w in Application.Current.Windows.Cast<Window>().Where(w => ((w as AdministrationWindow)?.IsEditing ?? false) || ((w as AdministrationWindow)?.IsCreating ?? false))) {
+                foreach (var w in Application.Current.Windows.Cast<Window>().Where(w => w is AdministrationWindow adm && (adm.IsEditing || adm.IsCreating))) {
                     try {
                         w.Close();
                     } catch { }
                 }
                 Thread.Sleep(100);
-                if (App.NumWindows > 1 && !Application.Current.Windows.Cast<Window>().Any(w => ((w as AdministrationWindow)?.IsEditing ?? false) || ((w as AdministrationWindow)?.IsCreating ?? false))) {
-                    if (!InteractionService.AskConfirmation("Elwig beenden", "Es sind noch weitere Fenster geöffnet.\nSollen alle Fenster geschlossen werden?")) {
+                if (App.NumWindows > 1) {
+                    var areAdminWindowsOpen = Application.Current.Windows.Cast<Window>().Any(w => w is AdministrationWindow adm && (adm.IsEditing || adm.IsCreating));
+                    if (areAdminWindowsOpen && !InteractionService.AskConfirmation("Elwig beenden", "Es sind noch weitere Fenster geöffnet.\nSollen alle Fenster geschlossen werden?")) {
+                        evt.Cancel = true;
                         return;
                     }
-                    App.ForceShutdown = true;
                 }
             }
-
-            Mouse.OverrideCursor = Cursors.AppStarting;
-            await (Application.Current as App)!.OnClosing();
-            Application.Current.Shutdown();
+            App.CurrentApp.ShutdownGracefully();
         }
 
         private void Menu_Help_About_Click(object sender, RoutedEventArgs evt) {