Move StateHasChanged to PageViewModel

Move StateHasChanged to PageViewModel

src/BitzArt.Blazor.MVVM/Components/PageBase.cs

@@ -21,8 +21,6 @@ public abstract class PageBase<TViewModel> : ComponentBase, IPersistentComponent
     [Inject]
     protected TViewModel ViewModel { get; set; } = null!;
 
-    PersistentComponentState IPersistentComponent.ComponentState => throw new NotImplementedException();
-
     /// <summary>
     /// Method invoked when the component is ready to start, having received its initial
     /// parameters from its parent in the render tree. Override this method if you will

src/BitzArt.Blazor.MVVM/ViewModels/PageViewModel.cs

@@ -17,7 +17,15 @@ public virtual Task InitializeAsync()
         return Task.CompletedTask;
     }
 
-    internal abstract Task PersistStateAsync();
+    internal virtual Task PersistStateAsync() => Task.CompletedTask;
+
+    /// <summary>
+    /// Notifies the component that the state has changed.
+    /// </summary>
+    protected void StateHasChanged()
+    {
+        Component.StateHasChanged();
+    }
 }
 
 /// <summary>
@@ -81,12 +89,4 @@ internal override Task PersistStateAsync()
 
         return Task.CompletedTask;
     }
-
-    /// <summary>
-    /// Notifies the component that the state has changed.
-    /// </summary>
-    protected void StateHasChanged()
-    {
-        Component.StateHasChanged();
-    }
 }