CommunityToolkit.Mvvm + Microsoft.Extensions.DependencyInjection

The MVVM Toolkit deliberately ships no DI container — it composes with Microsoft.Extensions.DependencyInjection, the same container ASP.NET Core, Worker services, and the .NET Generic Host use.

TL;DR. Build the service provider once at startup (prefer Host.CreateDefaultBuilder()). Register services and ViewModels. Inject through constructors. Avoid Ioc.Default.GetService<T>() in user code.

When to use this skill