How can we get Microsoft's dependency Injection to resolve dependencies within razor files referenced using Microsoft's BlazorWebView within a WPF app?

Question

I am using Microsoft.Extenssions.DependencyInjection to resolve dependencies. I am able to successfully inject dependencies into the MainWindow (I am keeping the scenario simple). But when I reference a razor file with dependencies using BlazorWebView, I cannot get the dependencies resolved. These razor files are from a Blazor Server app. If I remove all references to dependencies, I am able to access the Razor page. Microsoft Learn provides a simple implementation of BlazorWebViews within a WPF App: "Build a Windows Presentation Foundation (WPF) Blazor app", but the razor page referenced is a simple counter with no dependencies. I can get that to work! I even added a transient service referencing the Razor page . I have got the MAUI Blazor Windows Desktop working - but that requires certificates - which small to medium size companies don't need or can afford. So the only remaining option is BlazorWebViews!

Answer 1

Hi @Owsen, Craig ,

To inject the dependency service in the Raozr files, you need to register these services in the MainWindow.xaml.cs file.

For example, according to the Build a Windows Presentation Foundation (WPF) Blazor app, I create a WPF aplication, and then add a IDataRepository service like this:

In the MainWindow.xaml.cs file, register the service:

public MainWindow()  
	{  
		InitializeComponent();  

        var serviceCollection = new ServiceCollection();  
        serviceCollection.AddWpfBlazorWebView();  
		serviceCollection.AddTransient<IDataRepository, DataRepository>();  //register the service  
        Resources.Add("services", serviceCollection.BuildServiceProvider());  
    }  

After that in the Counter.cshtml page, we can inject the Service:

And the result as below:

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Best regards,
Dillion