Dependency Injection in WPF CSLA 10

[Greg90277]

Hi everyone.

I'm trying to set up dependency injection in a WPF project using CSLA 10 and .Net 10. In the app.xaml.cs file doing this:

public partial class App : Application
{
    // Application-level events, such as Startup, Exit, and DispatcherUnhandledException
    // can be handled in this file.

    // Added IHost to support dependency injection 4/8/2026
    private IHost _host;

    // Added constructor to support defining injected services for .Net 10   4/8/2026
    public App()
    {
        _host = Host.CreateDefaultBuilder()
            .ConfigureServices((context, services) =>
            {
                // Register CSLA and its WPF-specific dependencies
                services.AddCsla(options => options
                    .AddWpf() // Ensures correct ApplicationContext manager for WPF
                );

                // Register your ViewModels and Windows - IS THIS NECESSARY? NEED TO EXPERIMENT 4/8/2026
                services.AddTransient<ApplicationShell>();
                services.AddTransient<ApplicationShellViewModel>();
            })
            .Build();
    }

...

The
options.AddWpf()

Is throwing an error:

'CslaOptions' does not contain a definition for 'AddWpf' and no accessible extension method 'AddWpf' accepting a first argument of type 'CslaOptions' could be found (are you missing a using directive or an assembly reference?)

I have all required nuget references/using statements for CSLA in a GlobalUsings.cs class:

global using Csla;
global using Csla.Configuration;
global using Csla.Core;
global using Csla.Data;
global using Csla.Properties;
global using Csla.Rules;
global using Csla.Runtime;
global using Csla.Xaml;

Any ideas?

Thanks in advance!

Greg

[ossendorf-at-hoelscher]

Hi Greg,

there is no AddWpf Extension. You are looking for AddXaml() to use it in WPF.

[Greg90277]

Thanks for the quick response!

My objective is to have the Csla ApplicationContext injected automatically into business objects as it is in Blazor. I will test the above to see if that does the trick - or if you know how it's done please let me know.

Once I figure it out I'll post the solution.

Cheers!

Greg

[rockfordlhotka]

The WPF example app in /samples uses DI as you describe, so you can check that out.