I created a UserControl
<blazor:BlazorWebView x:Name="BlazorWebView" >
<usercontrols:DigitalClock />
</blazor:BlazorWebView>
In your code you are not running WPF app(BlazorWebViewTutorial.WpfApp) , rather BlazorWebViewTutorial.Shared App.
You will get exception at Window_ContentRendered.
Kindly show where you are real XAML file.
I created a UserControl
<blazor:BlazorWebView x:Name="BlazorWebView" >
<usercontrols:DigitalClock />
</blazor:BlazorWebView>
In your code you are not running WPF app(BlazorWebViewTutorial.WpfApp) , rather BlazorWebViewTutorial.Shared App.
You will get exception at Window_ContentRendered.
Kindly show where you are real XAML file.