juniorASP.NET Web API
What is dependency injection in Web API?
Updated Apr 28, 2026
Short answer
DI provides dependencies to classes instead of creating them.
Deep explanation
Dependency Injection improves testability and decoupling by injecting services via constructor.
Real-world example
Injecting database services.
Common mistakes
- Manual instantiation instead of DI.
Follow-up questions
- What is IoC?
- Why DI?