microsoft-extensions-dependency-injection

Organize .NET dependency injection registrations by grouping related services into static extension methods on IServiceCollection. This modular approach keeps Program.cs clean, prevents bloated files, and improves overall application readability.

The best way to structure dependency injection for feature modularity is encapsulating related service registrations into a dedicated Add{Feature}Services() extension method, making your DI setup scalable, reusable, and maintainable across different features.

Yes, dependency injection extension methods support factory-based registration, conditional registration, configuration binding, and keyed services for .NET 8+, allowing flexible and dynamic service resolution within your modular IServiceCollection setup.

Organizing service collections with extension methods improves testability by facilitating easier reuse of production dependency injection configurations in test environments, ensuring your tests accurately reflect your application's service resolution and lifetime management.

Lifetime management best practices for dependency injection extension methods involve properly structuring service registrations to avoid captive dependencies, ensuring scoped and singleton lifetimes are correctly configured within your modular IServiceCollection extension methods.