Software Practices

TH15 DI Why? Getting a Grip on Dependency Injection


1:15pm - 2:30pm

Level: Introductory to Intermediate

Jeremy Clark

Developer Educator

Many of our modern frameworks have Dependency Injection (DI) built in. But how do you use that effectively? You need to look at what DI is and why we want to use it. You'll look at the problems caused by tight coupling. Then you'll use some DI patterns such as constructor injection and property injection to break that tight coupling. You'll see how loosely-coupled applications are easier to extend and test. With a better understanding of the basic patterns, you'll remove the magic behind DI containers so that we can use the tools appropriately in our code.

You will learn:

  • The "what" and "why" of Dependency Injection
  • How loose coupling helps with extensibility and testability
  • How to use the constructor injection and property injection patterns in our code