How to Use Dependency Injection in ASP NET CORE 6 0. Create ASP.NET CORE Application with DI

Dependency Injection is the design pattern that helps us to create an application which loosely coupled. This means that objects should only have those dependencies that are required to complete tasks. The main advantage of DI (Dependency Injection) is our application is loosely coupled and has provided greater maintainability, testability, and also re-usability. It is loosely coupled because dependency required by the class is injected from the outer world rather than created themselves directly win-in code.

There are three types of DI: Construction Injection, Setter Injection, Interface based Injection. The Construction Injection type of DI accepts their dependency at the constructor level which means that when creating an object of the class, their dependency passes through the constructor of the class. It provides a strong dependency contract between objects. The Setter Injection is also known as property injection. In this type of dependency injection, dependency passes through public property instead of the constructor. It allows us to pass the dependencies when required. It does not provide a strong dependency contract between objects. The interface-based dependency injection can be achieved by creating the common interface and other classes are implements this interface to inject the dependency. In this type of DI, we can use either constructor injection or setter injection.