Expose CoreWebView2 initialization logic

WpfExtended.Blazor/Exceptions/CoreWebView2Exception.cs

@@ -0,0 +1,9 @@
+using Microsoft.Web.WebView2.Core;
+using System;
+
+namespace WpfExtended.Blazor.Exceptions;
+
+public sealed class CoreWebView2Exception(CoreWebView2ProcessFailedEventArgs args, string message, Exception? innerException = default) : Exception(message, innerException)
+{
+    public CoreWebView2ProcessFailedEventArgs Args { get; } = args ?? throw new ArgumentNullException(nameof(args));
+}

WpfExtended.Blazor/Launch/BlazorHostWindow.xaml.cs

@@ -1,4 +1,7 @@
-using System;
+using Microsoft.AspNetCore.Components.WebView;
+using Microsoft.AspNetCore.Components.WebView.Wpf;
+using Microsoft.Web.WebView2.Core;
+using System;
 using System.Windows;
 
 namespace WpfExtended.Blazor.Launch;
@@ -21,6 +24,14 @@ public partial class BlazorHostWindow : Window
     public static readonly DependencyProperty AppTypeProperty = DependencyProperty.Register(
         nameof(AppType), typeof(Type), typeof(BlazorHostWindow));
 
+    public event EventHandler<BlazorWebViewInitializedEventArgs>? BlazorWebViewInitialized;
+
+    public event EventHandler<BlazorWebViewInitializingEventArgs>? BlazorWebViewInitializing;
+
+    public event EventHandler<CoreWebView2InitializationCompletedEventArgs>? CoreWebView2InitializationCompleted;
+
+    public event EventHandler<CoreWebView2>? CoreWebView2Initialized;
+
     public IServiceProvider Services
     {
         get => (IServiceProvider)this.GetValue(ServicesProperty);
@@ -63,6 +74,8 @@ public partial class BlazorHostWindow : Window
         this.ShowTitleBar = blazorLaunchProperties.ShowTitleBar;
         this.HostPage = blazorLaunchProperties.HostPage;
         this.AppType = blazorLaunchProperties.AppType;
+        this.BlazorWebView.BlazorWebViewInitialized += this.BlazorWebView_BlazorWebViewInitialized;
+        this.BlazorWebView.BlazorWebViewInitializing += this.BlazorWebView_BlazorWebViewInitializing;
     }
 
     protected override void OnStateChanged(EventArgs e)
@@ -79,4 +92,27 @@ public partial class BlazorHostWindow : Window
                 : new Thickness(cornerRadius)
             : new Thickness(0, this.ShowTitleBar ? SystemParameters.CaptionHeight : 0, 0, 0);
     }
+
+    private void BlazorWebView_BlazorWebViewInitialized(object? sender, BlazorWebViewInitializedEventArgs args)
+    {
+        this.BlazorWebView.WebView.CoreWebView2InitializationCompleted += this.CoreWebView2_InitializationCompleted;
+        this.BlazorWebViewInitialized?.Invoke(this, args);
+    }
+
+    private void BlazorWebView_BlazorWebViewInitializing(object? sender, BlazorWebViewInitializingEventArgs args)
+    {
+        this.BlazorWebViewInitializing?.Invoke(this, args);
+    }
+
+    private void CoreWebView2_InitializationCompleted(object? sender, CoreWebView2InitializationCompletedEventArgs e)
+    {
+        this.CoreWebView2InitializationCompleted?.Invoke(this, e);
+
+        if (!e.IsSuccess)
+        {
+            return;
+        }
+
+        this.CoreWebView2Initialized?.Invoke(this, this.BlazorWebView.WebView.CoreWebView2);
+    }
 }

WpfExtended.Blazor/Launch/BlazorHybridApplication.cs

@@ -1,6 +1,11 @@
 using Microsoft.AspNetCore.Components;
+using Microsoft.AspNetCore.Components.WebView;
 using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Web.WebView2.Core;
+using System;
+using System.Threading.Tasks;
 using System.Windows.Extensions;
+using WpfExtended.Blazor.Exceptions;
 
 namespace WpfExtended.Blazor.Launch;
 
@@ -20,4 +25,54 @@ public abstract class BlazorHybridApplication<TApp> : ExtendedApplication<Blazor
             services.AddBlazorWebViewDeveloperTools();
         }
     }
+
+    protected override ValueTask ApplicationStarting()
+    {
+        var host = this.ServiceProvider.GetRequiredService<BlazorHostWindow>();
+        host.BlazorWebViewInitializing += (_, e) => this.Host_BlazorWebViewInitializing(e);
+        host.BlazorWebViewInitialized += (_, e) => this.Host_BlazorWebViewInitialized(e);
+        host.CoreWebView2InitializationCompleted += (_, e) => this.Host_CoreWebView2InitializationCompleted(e);
+        host.CoreWebView2Initialized += (_, e) => this.Host_CoreWebView2Initialized(e);
+
+        return ValueTask.CompletedTask;
+    }
+
+    protected virtual void Host_CoreWebView2Initialized(CoreWebView2 e)
+    {
+        e.ProcessFailed += (_, ex) => this.CoreWebView2_ProcessFailed(ex);
+    }
+
+    protected virtual void Host_CoreWebView2InitializationCompleted(CoreWebView2InitializationCompletedEventArgs e)
+    {
+        if (e.InitializationException is not null)
+        {
+            this.HandleException(e.InitializationException);
+            return;
+        }
+
+        if (e.IsSuccess is false)
+        {
+            this.HandleException(new InvalidOperationException("CoreWebView2 initialization failed."));
+            return;
+        }
+
+
+    }
+
+    protected virtual void Host_BlazorWebViewInitialized(BlazorWebViewInitializedEventArgs e)
+    {
+    }
+
+    protected virtual void Host_BlazorWebViewInitializing(BlazorWebViewInitializingEventArgs e)
+    {
+    }
+
+    private void CoreWebView2_ProcessFailed(CoreWebView2ProcessFailedEventArgs e)
+    {
+        var exception = new CoreWebView2Exception(e, "Encountered exception in CoreWebView2");
+        if (!this.HandleException(exception))
+        {
+            throw exception;
+        }
+    }
 }

WpfExtended.Blazor/WpfExtended.Blazor.csproj

@@ -4,7 +4,8 @@
     <TargetFrameworks>net9.0-windows</TargetFrameworks>
     <UseWPF>true</UseWPF>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
-    <Version>0.8.0</Version>
+    <Version>0.8.1</Version>
+    <Nullable>enable</Nullable>
     <LangVersion>latest</LangVersion>
     <Description>
       Extension library for Blazor Hybrid running on Windows Presentation Platform.

WpfExtended/WpfExtended.csproj

@@ -4,7 +4,7 @@
     <TargetFrameworks>net9.0-windows</TargetFrameworks>
     <UseWPF>true</UseWPF>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
-    <Version>0.8.0</Version>
+    <Version>0.8.1</Version>
     <LangVersion>latest</LangVersion>
     <Description>Extension library for Windows Presentation Platform.