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How is dependency injection set up in MAUI? What are the DI service lifetimes and when do you use each? How do you inject a view model into a page? How do you register and use HttpClient with IHttpClientFactory in MAUI? How do you resolve services from a static or platform context where constructor injection isn't possible? How do you implement a messaging/event aggregator to decouple view models?
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.NET MAUI › Dependency Injection & Services

What is the service locator anti-pattern and how do you avoid it in MAUI?

Intermediate

Answer

Service location (e.g., calling a static Resolve or Handler.MauiContext.Services.GetService) hides dependencies and hurts testability. Prefer constructor injection so a class's needs are explicit. When you truly can't inject (e.g., in a platform static context), isolate the lookup behind an interface and keep it out of business logic.
// Prefer this
public OrdersViewModel(IOrderService svc) { _svc = svc; }

// Avoid scattering this
var svc = Application.Current.Handler.MauiContext.Services
    .GetService<IOrderService>();
Real-world example A code review rejects a view model that pulls services from a static locator in favor of explicit constructor parameters that tests can supply mocks for.

Common follow-ups: When is service location unavoidable? | Why does DI help testing?

Dependency Injection Testing & Debugging MVVM
All 7 Dependency Injection & Services questions