Constructor Dependency Injection

This is the most commonly used Dependency Pattern. The Constructor Injection uses a parameter to inject dependencies. Generally, there is normally one parameterized constructor always. So in this case, the object has no default constructor and we need to pass specified values or dependency at the time of initiation the object.

We will go through one example for better understanding of this type of dependency injection.

IBook.cs

Book.cs

Library.cs

Program.cs

Here,the Injection happens in the constructor, by passing the Service that implements the IBook Interface.