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How to Use Dependency Injection in ASP.NET

How to Use Dependency Injection in C# ASP.NET

How to Use Dependency Injection in ASP.NET?

This article will teach us how to use dependency injection in ASP.NET. Dependency injection is a design pattern that allows for decoupling components in a software application. It allows for the injection of dependencies or objects that a component relies on through its constructor or methods. This way, the component can be easily tested and reused without being tightly coupled to its dependencies. 

In ASP.NET, the most popular dependency injection framework is Microsoft’s built-in dependency injection framework. 

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Dependency Injection in an ASP.Net web application

Here are the steps to use dependency injection in an ASP.NET Core application

  • Install the Microsoft.Extensions.DependencyInjection package via NuGet.
  • In the Startup.cs file, add the following line to the ConfigureServices method to set up the dependency injection container:



  • Inject the service into the constructor of a controller or other class that needs it:



  • Use the injected service in the controller’s actions or methods:


Please note that the example above is a simple and general one, in a real-world scenario you need to consider many other things like scoping, lifetime of services, registering them correctly and so on. If you want to skyrocket your C# career, check out our powerful ASP.NET full-stack web development course that also covers test-driven development and C# software architecture.


Dependency Injection Advantages

Dependency injection in ASP.NET has several advantages:

  • Decoupling of components: Components are no longer tightly coupled to their dependencies by injecting dependencies through the constructor or methods. This allows for more flexibility in the application’s design and makes testing and reusing components easier.


  • Easier testing: With dependency injection, components can be easily tested in isolation by injecting mock dependencies. This makes it easier to write unit tests and ensures that the component is functioning correctly.


  • Improved maintainability: By decoupling components and making them more testable, dependency injection helps improve an application’s maintainability over time.


  • Better scalability: Dependency injection allows for the easy swapping out of dependencies, making it easier to scale the application as requirements change.


  • Flexibility and control over the lifecycle of objects: Dependency injection frameworks like the one in ASP.NET provide different lifecycle management options like transient, scoped, singleton, and so on, which gives more control over the lifetime of objects and make them more flexible.


  • Centralized registration of services: Dependency injection frameworks provide a centralized location for registering services, making it easy to manage and maintain the dependencies of an application.

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Dependency injection helps developers create more flexible, testable, and maintainable code, making the development process more efficient and streamlined. Dependency injection is a powerful design pattern to decouple components in ASP.NET applications. Using Microsoft’s built-in dependency injection framework, developers can easily inject dependencies into their controllers and other classes, making their code more testable and reusable.

Following the steps outlined in this article, developers can quickly and easily set up dependency injection in their ASP.NET applications and take advantage of its many benefits. It is important to remember that, like any other pattern, it requires a good understanding of the problem and the context to be used correctly.


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