Dependency Injection Design Pattern in C# with Examples
In this article, I am going to discuss the Dependency Injection Design Pattern in C# with examples. Please read our previous article where we discussed the Singleton Design Pattern in C# with some examples. Nowadays, the dependency injection design pattern is one of the most frequently used design patterns in real-time applications. So, as a developer, you should know why and how to use the Dependency Injection Design Pattern in C#. We divided the dependency injection design pattern into three parts. As part of this article, we are going to discuss the following pointers in detail.
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Why Do We Need Dependency Injection (DI) Design Pattern in C#?What is Tight Coupling and Loose Coupling in Software Design?What is Dependency Injection Design Pattern in C#?Types of Dependency Injection Design Pattern in C#. Constructor Injection Property Injection Method InjectionExample using Constructor Dependency InjectionWhat are the Advantages of Constructor Dependency Injection?
In part 2, we are going to discuss Property and Method Dependency Injection with examples. And in part 3, we are going to discuss the Unity Container in C# with an example.
Why do we need the Dependency Injection in C#?
The Dependency Injection is a design pattern that allows us to develop loosely coupled software components. In other words, we can say that this design pattern is used to reduce the tight coupling between the software components. As a result, we can easily manage future changes and other complexity in our application.
Before understanding the Dependency Injection Design Pattern using C#, first, we need to understand what is tight coupling and what is loose coupling in software development. So let’s understand these two concepts first.
What is Tight Coupling in Software Design?
Tight coupling means classes and objects are dependent on each other. That means when a class is dependent on another concrete class, then it is said to be a tight coupling between these two classes. In that case, if we change the dependent object, then we also need to change the classes where this dependent object is used. If your application is a small one, then it is not that difficult to handle but if you have a big enterprise-level application, then its really very difficult to handle to make these changes.
What is Loose Coupling in Software Design?
Loosely coupling means two objects are independent of each other. That means if we change one object then it will not affect another object. The loosely coupled nature of software development allows us to manage future changes easily and also allows us to manage the complexity of the application.
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What is Dependency Injection Design Pattern in C#?
The Dependency Injection Design Pattern in C# is a process in which we are injecting the object of a class into a class that depends on that object. The Dependency Injection design pattern is the most commonly used design pattern nowadays to remove the dependencies between the objects.
Dependency Injection (DI) is a design pattern used to implement IoC. It allows the creation of dependency objects outside of a class and provides those objects to a class in different ways. Using DI, we move the creation and binding of the dependent objects outside of the class that depends on them.
Dependency Injection pattern involves 3 types of classes:
Client Class: The Client class (dependent class) is a class that depends on the service class.Service Class: The Service class (dependency) is a class that provides service to the client class.Injector Class: The Injector class injects the service class object into the client class.
For better understanding, please have a look at the following diagram.
Advantages of Constructor Dependency InjectionThe Constructor Dependency Injection Design Pattern makes a strong dependency contractThis design pattern support testing as the dependencies are passed through the constructor.
In the next article, I am going to discuss the Property and Method dependency injection with some real-time examples. Here, in this article, I try to explain the Dependency Injection Design Pattern in C# steps by step with an example. I hope you understood the need and use of the Dependency Injection Design Pattern.