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What are the DI service lifetimes and when do you use each? How do you inject a view model into a page? What is the service locator anti-pattern and how do you avoid it in MAUI? 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

How is dependency injection set up in MAUI?

Beginner

Answer

MAUI uses Microsoft.Extensions.DependencyInjection through the Generic Host. Register services on builder.Services in MauiProgram.CreateMauiApp, then constructor-inject them into pages and view models. The container resolves the whole graph when a registered page is created.
builder.Services.AddSingleton<IApiClient, ApiClient>();
builder.Services.AddTransient<MainViewModel>();
builder.Services.AddTransient<MainPage>();
Real-world example Every page receives its view model and services through the constructor, so nothing is newed up manually in the UI layer.

Common follow-ups: Where do you register services? | How does a page get its dependencies?

Dependency Injection MauiProgram MVVM
All 7 Dependency Injection & Services questions