Tried to make WebViewControlNavigationCompletedEventArgs report a better status, but no real way to be sure of IsSuccess.

Microsoft.Toolkit.Wpf.UI.Controls/Microsoft.Toolkit.Wpf.UI.Controls.csproj

@@ -66,7 +66,6 @@
     <Reference Include="System.Drawing" />
     <Reference Include="System.Net" />
     <Reference Include="System.Net.Http" />
-    <Reference Include="System.Windows.Forms" />
     <Reference Include="System.Xaml" />
     <Reference Include="WindowsBase" />
     <Reference Include="System.Runtime.WindowsRuntime">

WebView.Shared/Interop/WinRT/WebViewControlNavigationCompletedEventArgs.cs

@@ -32,12 +32,14 @@ namespace Microsoft.Toolkit.Win32.UI.Controls.Interop.WinRT
 #if WPF
         internal WebViewControlNavigationCompletedEventArgs(System.Windows.Navigation.NavigationEventArgs e)
         {
+            IsSuccess = true; // no ability to detect otherwise
             Uri = e.Uri;
         }
 #endif
 
         internal WebViewControlNavigationCompletedEventArgs(WebBrowserNavigatedEventArgs e)
         {
+            IsSuccess = true; // no ability to detect otherwise
             Uri = e.Url;
         }