ASP.NET Core in Action, Third Edition

8 An introduction to dependency injection

This chapter covers

• Understanding the benefits of dependency injection
• Seeing how ASP.NET Core uses dependency injection
• Retrieving services from the DI container

In part 1 of this book you saw the bare bones of how to build applications with ASP.NET Core. You learned how to compose middleware to create your application and how to create minimal API endpoints to handle HTTP requests. This part gave you the tools to start building simple API applications.

In this chapter you’ll see how to use dependency injection (DI)—a design pattern that helps you develop loosely coupled code—in your ASP.NET Core applications. ASP.NET Core uses the pattern extensively, both internally in the framework and in the applications ...