No longer require overriding Initialize() or RegisterTypes() in A…

…pp.axaml.cs

build/Base.props

@@ -2,7 +2,7 @@
 <Project DefaultTargets="Build"
          xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
-    <Version>9.0.537.11130</Version>
+    <Version>9.0.537.11131</Version>
     <PackageProjectUrl>https://github.com/AvaloniaCommunity/Prism.Avalonia</PackageProjectUrl>
     <Copyright>Copyright (c) 2024 Xeno Innovations, Inc.</Copyright>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>

e2e/SampleBaseApp/App.axaml.cs

@@ -1,6 +1,5 @@
 using System;
 using Avalonia;
-using Avalonia.Markup.Xaml;
 using Prism.DryIoc;
 using Prism.Ioc;
 using SampleBaseApp.Views;
@@ -9,56 +8,9 @@ namespace SampleBaseApp;
 
 public partial class App : PrismApplication
 {
-  public override void Initialize()
-  {
-    Console.WriteLine("Initialize()");
-
-    AvaloniaXamlLoader.Load(this);
-
-    // Required to initialize Prism.Avalonia - DO NOT REMOVE
-    base.Initialize();
-  }
-
   protected override AvaloniaObject CreateShell()
   {
-    Console.WriteLine("CreateShell()");
-
+    System.Diagnostics.Debug.WriteLine("CreateShell()");
     return Container.Resolve<MainWindow>();
   }
-
-  protected override void RegisterTypes(IContainerRegistry containerRegistry)
-  {
-    // Add Services and ViewModel registrations here
-
-    Console.WriteLine("RegisterTypes()");
-
-    // -=[ Sample ]=-
-    //
-    //  // Services
-    //  containerRegistry.RegisterSingleton<INotificationService, NotificationService>();
-    //
-    //  // Views - Region Navigation
-    //  containerRegistry.RegisterForNavigation<DashboardView, DashboardViewModel>();
-  }
-
-  /**
-   * NOT NEEDED:
-   *  The following is used by vanilla Avalonia. Prism.Avalonia only needs, `CreateShell()`
-   *
-  public override void OnFrameworkInitializationCompleted()
-  {
-    if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
-    {
-      // Line below is needed to remove Avalonia data validation.
-      // Without this line you will get duplicate validations from both Avalonia and CT
-      BindingPlugins.DataValidators.RemoveAt(0);
-      desktop.MainWindow = new MainWindow
-      {
-        DataContext = new MainWindowViewModel(),
-      };
-    }
-
-    base.OnFrameworkInitializationCompleted();
-  }
-  */
 }

e2e/SampleDialogApp/App.axaml.cs

@@ -1,6 +1,5 @@
 using System;
 using Avalonia;
-using Avalonia.Markup.Xaml;
 using Prism.DryIoc;
 using Prism.Ioc;
 using SampleDialogApp.ViewModels;
@@ -10,11 +9,13 @@ namespace SampleDialogApp;
 
 public partial class App : PrismApplication
 {
+    /*
     public override void Initialize()
     {
-        AvaloniaXamlLoader.Load(this);
-        base.Initialize();  // Required to initialize Prism.Avalonia - DO NOT REMOVE
+        // Required when overriding Initialize()
+        base.Initialize();
     }
+    */
 
     protected override AvaloniaObject CreateShell()
     {

e2e/SampleMvvmApp/App.axaml.cs

@@ -1,7 +1,6 @@
-using System;
+using System.Diagnostics;
 using Avalonia;
 using Avalonia.Controls;
-using Avalonia.Markup.Xaml;
 using Prism.DryIoc;
 using Prism.Ioc;
 using Prism.Modularity;
@@ -20,10 +19,9 @@ namespace SampleMvvmApp;
 /// </summary>
 public class App : PrismApplication
 {
-    /// <summary>App entry point.</summary>
     public App()
     {
-        Console.WriteLine("Constructor()");
+        Debug.WriteLine("Constructor()");
     }
 
     // Note:
@@ -32,8 +30,10 @@ public App()
     //  Therefore, we need this as a `public override void` in PrismApplicationBase.cs
     public override void Initialize()
     {
-        Console.WriteLine("Initialize()");
-        AvaloniaXamlLoader.Load(this);
+        Debug.WriteLine("Initialize()");
+
+        // Only required when a constructor is defined
+        Avalonia.Markup.Xaml.AvaloniaXamlLoader.Load(this);
 
         // Initializes Prism.Avalonia - DO NOT REMOVE
         base.Initialize();
@@ -43,7 +43,7 @@ public override void Initialize()
     /// <param name="containerRegistry"></param>
     protected override void RegisterTypes(IContainerRegistry containerRegistry)
     {
-        Console.WriteLine("RegisterTypes()");
+        Debug.WriteLine("RegisterTypes()");
 
         // Services
         containerRegistry.RegisterSingleton<INotificationService, NotificationService>();
@@ -62,20 +62,25 @@ protected override void RegisterTypes(IContainerRegistry containerRegistry)
     /// <param name="moduleCatalog">Module Catalog.</param>
     protected override void ConfigureModuleCatalog(IModuleCatalog moduleCatalog)
     {
+        Debug.WriteLine("ConfigureModuleCatalog()");
+
         base.ConfigureModuleCatalog(moduleCatalog);
     }
 
     /// <summary>User interface entry point, called after Register and ConfigureModules.</summary>
     /// <returns>Startup View.</returns>
     protected override AvaloniaObject CreateShell()
     {
-        Console.WriteLine("CreateShell()");
+        Debug.WriteLine("CreateShell()");
+
         return Container.Resolve<MainWindow>();
     }
 
     /// <summary>Called after Initialize.</summary>
     protected override void OnInitialized()
     {
+        Debug.WriteLine("OnInitialized()");
+
         // Register Views to the Region it will appear in. Don't register them in the ViewModel.
         var regionManager = Container.Resolve<IRegionManager>();
 
@@ -94,6 +99,8 @@ protected override void OnInitialized()
 
     protected override void ConfigureRegionAdapterMappings(RegionAdapterMappings regionAdapterMappings)
     {
+        Debug.WriteLine("ConfigureRegionAdapterMappings()");
+
         regionAdapterMappings.RegisterMapping<ItemsControl, SampleMvvmApp.RegionAdapters.ItemsControlRegionAdapter>();
         regionAdapterMappings.RegisterMapping<ContentControl, ContentControlRegionAdapter>();
     }

e2e/ViewDiscovery/App.axaml.cs

@@ -1,5 +1,4 @@
-using System;
-using Avalonia;
+using Avalonia;
 using Avalonia.Markup.Xaml;
 using Prism.DryIoc;
 using Prism.Ioc;
@@ -17,8 +16,8 @@ public App()
     public override void Initialize()
     {
         System.Diagnostics.Debug.WriteLine("Initialize()");
-        AvaloniaXamlLoader.Load(this);
-        base.Initialize();
+        AvaloniaXamlLoader.Load(this); // Only required when overriding constructor
+        base.Initialize();             // Must include when overriding
     }
 
     protected override void RegisterTypes(IContainerRegistry containerRegistry)

src/Prism.Avalonia/PrismApplicationBase.cs

@@ -2,6 +2,7 @@
 using Avalonia;
 using Avalonia.Controls;
 using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Markup.Xaml;
 using Prism.Common;
 using Prism.Ioc;
 using Prism.Modularity;
@@ -48,6 +49,14 @@ public override void Initialize()
         {
             base.Initialize();
 
+            try
+            {
+                AvaloniaXamlLoader.Load(this);
+            }
+            catch
+            {
+            }
+
             ConfigureViewModelLocator();
 
             ContainerLocator.SetContainerExtension(CreateContainerExtension());
@@ -119,7 +128,9 @@ protected virtual void RegisterRequiredTypes(IContainerRegistry containerRegistr
         /// <summary>
         /// Used to register types with the container that will be used by your application.
         /// </summary>
-        protected abstract void RegisterTypes(IContainerRegistry containerRegistry);
+        protected virtual void RegisterTypes(IContainerRegistry containerRegistry)
+        {
+        }
 
         /// <summary>
         /// Configures the <see cref="IRegionBehaviorFactory"/>.