Dependency Injection (DI) is a fundamental concept in .NET Core that facilitates loose coupling between components in an application by allowing dependencies to be injected into a class rather than created internally within the class itself. Here are some advanced interview questions related to Dependency Injection in .NET Core:
1. **Explain the concept of Dependency Injection and its benefits in .NET Core. How does it promote loose coupling and improve testability?**
2. **What are the different lifetimes of services in .NET Core DI container? Explain each type (Transient, Scoped, Singleton) and provide examples of when to use each.**
3. **How does .NET Core resolve dependencies when using constructor injection? Explain the process of service registration and resolution in the DI container.**
4. **What are the drawbacks of using the built-in DI container in .NET Core? When might you consider using a third-party DI container like Autofac or Ninject instead?**
5. **How can you customize the behavior of the built-in DI container in .NET Core? Provide examples of scenarios where you might need to customize service registration or resolution.**
6. **Explain the concept of named and typed registrations in .NET Core DI container. When would you use named or typed registrations, and how do you implement them?**
7. **Discuss the relationship between DI and inversion of control (IoC). How does DI enable IoC, and what are the benefits of applying IoC principles in software design?**
8. **Explain how you can handle dependency resolution for classes with multiple constructors in .NET Core DI. What are the considerations for selecting the appropriate constructor?**
9. **How can you resolve dependencies for classes that have dependencies on configuration settings or options in .NET Core? Discuss best practices for injecting configuration settings into classes.**
10. **Discuss the impact of DI on unit testing in .NET Core. How does DI facilitate mocking and stubbing of dependencies, and what are some best practices for writing unit tests for classes with injected dependencies?**
These questions cover various aspects of Dependency Injection in .NET Core, including its principles, implementation details, customization options, and its impact on software design, testing, and maintainability. Demonstrating a deep understanding of these concepts and their practical applications can be beneficial in advanced .NET Core interviews.
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