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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? What is the service locator anti-pattern and how do you avoid it 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 do you register and use HttpClient with IHttpClientFactory in MAUI?

Intermediate

Answer

Call builder.Services.AddHttpClient to register typed or named clients backed by IHttpClientFactory, which manages handler pooling and lifetime. Inject the typed client into services. This avoids socket exhaustion from newing HttpClient and centralizes base addresses and default headers.
builder.Services.AddHttpClient<IApiClient, ApiClient>(c =>
{
    c.BaseAddress = new Uri("https://api.example.com");
    c.Timeout = TimeSpan.FromSeconds(30);
});
Real-world example An app's API layer gets pooled, correctly-configured HttpClients through the factory rather than one leaked static instance.

Common follow-ups: Why not new up HttpClient? | What is a typed client?

Networking & APIs Dependency Injection Performance & Optimization
All 7 Dependency Injection & Services questions