Services and Interfaces

1. What is the primary purpose of defining interfaces for services in the service layer?

To improve performance To enable replaceability and testability To create deep inheritance hierarchies To make services easier to register

2. Which lifetime should be used for HttpContext in ASP.NET Core DI?

Transient Singleton Scoped Transient and Scoped

3. What does a service locator pattern do that is discouraged in dependency injection?

Increases testability Hides dependencies Enhances performance Simplifies code

4. What is a common mistake when configuring singleton services in relation to scoped dependencies?

Using transient dependencies Mixing different dependency lifetimes Not using interfaces Registering services without lifetimes