Individual skill

mvvm-toolkit-di

Wire CommunityToolkit.Mvvm ViewModels into Microsoft.Extensions.DependencyInjection. Covers the .NET Generic Host composition root, constructor injection, service lifetimes (Singleton / Transient / Scoped), IMessenger registration, resolving ViewModels in Views, keyed services, testing seams, and the legacy Ioc.Default escape hatch. Use across WPF, WinUI 3, .NET MAUI, Uno, and Avalonia.

skills/mvvm-toolkit-di/SKILL.md

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Repository stars (not skill ratings): 40,891
Repository last updated: Nov 6, 2026
License: MIT

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# 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.

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