[#57] DeliveryScheduleAdminWindow: Use Task.Run()

Elwig/Services/DeliveryScheduleService.cs

@@ -152,7 +152,8 @@ namespace Elwig.Services {
         public static async Task UpdateDeliverySchedule(this DeliveryScheduleAdminViewModel vm, int? oldYear, int? oldDsNr) {
             int year = vm.Date!.Value.Year;
 
-            using (var ctx = new AppDbContext()) {
+            await Task.Run(async () => {
+                using var ctx = new AppDbContext();
                 var s = new DeliverySchedule {
                     Year = oldYear ?? year,
                     DsNr = oldDsNr ?? await ctx.NextDsNr(year),
@@ -181,7 +182,7 @@ namespace Elwig.Services {
                     .ToList(), vm.MainVarieties.Select(v => (v, 1)).Union(vm.OtherVarieties.Select(v => (v, 2))).ToList());
 
                 await ctx.SaveChangesAsync();
-            }
+            });
 
             App.HintContextChange();
         }

Elwig/Windows/DeliveryScheduleAdminWindow.xaml.cs

@@ -177,18 +177,19 @@ namespace Elwig.Windows {
                 $"Soll der Leseplan \"{s.Description}\" vom {s.Date:dd.MM.yyyy} wirklich unwiderruflich gelöscht werden?",
                 "Leseplan löschen", MessageBoxButton.OKCancel, MessageBoxImage.Warning, MessageBoxResult.Cancel);
             if (r == MessageBoxResult.OK) {
-                Mouse.OverrideCursor = Cursors.AppStarting;
+                Mouse.OverrideCursor = Cursors.Wait;
+                await Task.Run(async () => {
                     try {
-                    using (var ctx = new AppDbContext()) {
+                        using var ctx = new AppDbContext();
                         ctx.Remove(s);
                         await ctx.SaveChangesAsync();
-                    }
-                    App.HintContextChange();
                     } catch (Exception exc) {
                         var str = "Der Eintrag konnte nicht in der Datenbank aktualisiert werden!\n\n" + exc.Message;
                         if (exc.InnerException != null) str += "\n\n" + exc.InnerException.Message;
                         MessageBox.Show(str, "Leseplan löschen", MessageBoxButton.OK, MessageBoxImage.Error);
                     }
+                });
+                App.HintContextChange();
                 Mouse.OverrideCursor = null;
             }
         }
@@ -200,7 +201,7 @@ namespace Elwig.Windows {
         }
 
         private async void SaveButton_Click(object? sender, RoutedEventArgs? evt) {
-            Mouse.OverrideCursor = Cursors.AppStarting;
+            Mouse.OverrideCursor = Cursors.Wait;
             SaveButton.IsEnabled = false;
 
             try {