Dependency injection (DI) is a design pattern commonly used in modern software development to manage dependencies between different components of an application. This is an effective technique for creating loosely coupled applications, making it easy to modify and extend code without affecting the rest of the system. In this article, I’ll explore how to implement Dependency Injection in ASP.NET Core 6 using C#, including step-by-step instructions and a sample web application.
What is dependency injection?
Dependency injection is a software design pattern that involves creating objects with their dependencies provided outside the object itself. In this pattern, an object’s dependencies are provided to it instead of being created by the object itself. This pattern allows better decoupling of dependencies, leading to more modular and maintainable code. By implementing DI, classes can be made more flexible and can be easily tested.
Dependency Injection in ASP.NET Core 6
ASP.NET Core 6 is a modern web framework designed to be modular and flexible. It provides built-in support for dependency injection, making it easy to implement the pattern in your applications.
In ASP.NET Core 6, DI is implemented using the built-in services container. The services container is responsible for creating and managing instances of services required by your application. The container can be configured to create services on demand or as individuals shared in the application.
The services container can be accessed from anywhere in your application using the built-in dependency injection system. To use the system, you define the dependencies of your classes as constructor parameters. When an instance of your class is created, the dependency injection system will automatically provide it with the required dependencies.
Implementing dependency injection in ASP.NET Core 6
To demonstrate how to implement Dependency Injection in ASP.NET Core 6 using C#, we’ll create a simple web application that displays a list of products.
Step 1: Create a new ASP.NET Core application
Open Visual Studio and create a new ASP.NET Core web application. Select the “Web Application” template and select “ASP.NET Core 6” as the target framework.
Step 2: Add a new service
In the root of your project, create a new folder named “Services”. Inside this folder, create a new class called “ProductService”. This class will be responsible for providing a list of products to our application.
using System.Collections.Generic; namespace Codingvila_DependencyInjectionDemo.Services { public class ProductService { public List<string> GetProducts() { return new List<string> { "Product A", "Product B", "Product C" }; } } }
Step 3: Register the service with the services container
Open the “Startup.cs” file and add the following code to the “ConfigureServices” method:
services.AddScoped<ProductService>();
This code registers the ProductService with the services container. The “AddScoped” method specifies that a new instance of ProductService will be created for each request.
Step 4: Add a new controller
In the root of your project, create a new folder called “controls”. Inside this folder, create a new controller called “ProductController”. This controller will be responsible for displaying the product list.
using Codingvila_DependencyInjectionDemo.Services; using Microsoft.AspNetCore.Mvc; namespace Codingvila_DependencyInjectionDemo.Controllers { public class ProductController : Controller { private readonly ProductService _productService; public ProductController(ProductService productService) { _productService = productService; } public IActionResult Index() { var products = _productService.GetProducts(); return View(products); } } }
Note that the ProductService is passed as a parameter to the constructor of the ProductController class. This is how we inject the dependency into the controller.
Step 5: Add a new view
In the “Views” folder, create a new folder called “Product”. Inside this folder, create a new view called “Index.cshtml”. Add the following code to the display:
@model List<string> <h1>Products</h1> <ul> @foreach (var product in Model) { <li>@product</li> } </ul>
This code defines a simple HTML page that displays a list of products. The products are transferred to the display using the “model” property.
Step 6: Launch the app
Press F5 to run the application. You should see a page showing a list of products.
Congratulations, you have successfully implemented dependency injection in ASP.NET Core 6 using C#! By using dependency injection, you have created a modular and more maintainable application.
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Summary
Dependency injection is an important pattern for creating maintainable and testable applications. ASP.NET Core 6 provides built-in support for Dependency Injection, making it easier to implement in your applications. By using dependency injection, you can create more modular and maintainable applications that are easier to test and extend.
