dependency-injection-patterns

Organize dependency injection registrations by moving related services into composable IServiceCollection extension methods like Add{Feature}Services(). This keeps Program.cs focused on composition and groups registrations by feature for better maintainability.

Reuse service registration configurations by building composable Add* extension methods that act as a shared composition root. Integration tests can call the same methods and override only the specific dependencies needed for testing.

Avoid injecting scoped services into singletons by following lifetime and scoping correctness rules within your feature-based service registrations. Apply best practices for singleton, scoped, and transient lifetimes to prevent common captive dependency mistakes.

IServiceCollection extension methods support feature-based library design by defining named service grouping methods that return IServiceCollection for chaining. This enables libraries to expose shareable and overridable dependency injection configurations.

The pattern groups extensive service registrations into feature-scoped Add{Feature}Services() extension methods. This composition root pattern prevents unmaintainable Program.cs files and enables reuse across production and test environments.

Refactoring dependency injection registrations into extension methods supports configuration parameters. These methods can accept parameters, return IServiceCollection for chaining, and follow lifetime and scoping correctness rules for flexible composition.