Dependency injection c# là gì

     

Dependency Injection thiết kế Pattern in C# with Examples

In this article, I am going to lớn discuss the Dependency Injection thiết kế Pattern in C# with Examples. Please read our previous article where we discussed the Singleton thiết kế Pattern in C# with 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 & how to use the Dependency Injection kiến thiết Pattern in C#. We divided the dependency injection thiết kế pattern into three parts. As part of this article, we are going khổng lồ discuss the following pointers in detail.

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Why vày We Need Dependency Injection (DI) design Pattern in C#?What are 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 khổng lồ discuss Property & Method Dependency Injection with examples. Và in part 3, we are going khổng lồ discuss the Dependency Injection kiến thiết Pattern using Unity Container in C# with an example.

Why vì chưng we need the Dependency Injection kiến thiết Pattern in C#?

The Dependency Injection design Pattern in C# allows us khổng lồ develop loosely coupled software components. In other words, we can say that Dependency Injection thiết kế Pattern is used to lớn reduce the tight coupling between the software components. As a result, we can easily manage future changes & other complexity in our application.

Before understanding the Dependency Injection thiết kế Pattern using C#, let us first 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 two objects are dependent on each other. That means when a class is dependent on another class, then it is said lớn be a tight coupling between these two classes. In that case, if we change the dependent object, then we also need khổng lồ change the classes where this dependent object is used. If your application is a small one, then it is not that difficult khổng lồ handle but if you have a big enterprise-level application, then it’s really very difficult to lớn 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 lớn manage future changes easily và also allows us lớn manage the complexity of the application.

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What is Dependency Injection thiết kế Pattern in C#?

The Dependency Injection kiến thiết 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 kiến thiết pattern is the most commonly used kiến thiết pattern nowadays khổng lồ remove the dependencies between the objects.

Dependency Injection (DI) is a kiến thiết pattern used khổng lồ implement IoC (Inversion of Control). It allows the creation of dependency objects outside of a class and provides those objects to lớn a class in different ways. Using Dependency Injection thiết kế Pattern, we move the creation và 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 lớn 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.

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Advantages of Constructor Dependency InjectionThe Constructor Dependency Injection kiến thiết Pattern makes a strong dependency contractThis kiến thiết pattern tư vấn testing as the dependencies are passed through the constructor.

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In the next article, I am going to discuss the Property và Method dependency injection with real-time examples. Here, in this article, I try to lớn explain the Dependency Injection kiến thiết Pattern in C# with an example. I hope you understood the need và use of the Dependency Injection design Pattern in C#.