Add supported for key mediator handelrs

Bitvault/ItemContentViewModel.cs

@@ -2,27 +2,29 @@
 
 namespace Bitvault;
 
-//[Aggerate(nameof(ItemContentViewModel))]
-public partial class ItemContentViewModel :
-    ObservableCollection<IItemEntryViewModel>,
+public partial class ItemContentViewModel(IServiceProvider provider,
+    IServiceFactory factory, IMediator mediator,
+    IPublisher publisher,
+    ISubscription subscriber,
+    IDisposer disposer,
+    IContentTemplate template,
+    ItemState state = ItemState.Read) :
+    ObservableCollection<IItemEntryViewModel>(provider, factory, mediator, publisher, subscriber, disposer),
     IItemEntryViewModel,
     INotificationHandler<NotifyEventArgs<ItemCategory<string>>>
 {
-    public ItemContentViewModel(IServiceProvider provider,
-        IServiceFactory factory, IMediator mediator,
-        IPublisher publisher,
-        ISubscription subscriber,
-        IDisposer disposer,
-        IContentTemplate template,
-        ItemState state = ItemState.Read) : base(provider, factory, mediator, publisher, subscriber, disposer)
-    {
-        Template = template;
-    }
-
-    public IContentTemplate Template { get; set; }
+    public IContentTemplate Template { get; set; } = template;
 
     public Task Handle(NotifyEventArgs<ItemCategory<string>> args)
     {
+        if (args.Value is ItemCategory<string> category)
+        {
+            if (category.Value is string value)
+            {
+                Fetch(() => new AggregateExpression(new AggerateEventArgs<IItemEntryViewModel, string>(value)), true);
+            }
+        }
+
         return Task.CompletedTask;
     }
 }