dotnet-csharp-dependency-injection

ASP.NET Core dependency injection supports Transient, Scoped, and Singleton service lifetimes. You register services using extension methods to ensure correct instantiation, maintaining efficient and maintainable code across individual web requests.

A captive dependency occurs when a service with a shorter lifetime is injected into a service with a longer lifetime. You prevent it in .NET DI by enabling scope validation to detect lifetime mismatches during application startup.

Keyed services in .NET 8 dependency injection allow registering multiple implementations of an interface and resolving them by a specific key. This advanced registration pattern simplifies selecting the correct service implementation during resolution.

Yes, Microsoft.Extensions.DependencyInjection supports factory delegates for advanced service registration. This allows you to provide a custom factory function to manually instantiate services during dependency resolution, offering fine-grained control.

The decorator pattern in .NET dependency injection wraps an existing service implementation with additional behavior. You achieve this by registering the decorated service and then wrapping it during resolution to augment functionality without modifying original code.

You register a background worker as a hosted service in ASP.NET Core by adding it to the dependency injection container. This ensures the worker is started and stopped correctly by the application's host lifetime management infrastructure.