Dependency Injection C#

Dependency Injection (DI) is a design pattern that is commonly used in modern software development to manage dependencies between different components of an application. It is an effective technique for creating loosely coupled applications, making it easier to modify and extend code without affecting the rest of the system. In this article, I will explore how to implement dependency injection c#, including step-by-step instructions and an example web application.

What is Dependency Injection?

Dependency Injection is a software design pattern that involves creating objects with their dependencies supplied from outside the object itself. In this pattern, an object's dependencies are provided to it rather than being created by the object itself. This pattern allows for 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 that is 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 that are required by your application. The container can be configured to create services on demand or as singletons that are shared across 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 will 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. Choose 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 called "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 the ProductService will be created for each request.

Step 4: Add a new controller

In the root of your project, create a new folder called "Controllers". Inside this folder, create a new controller called "ProductController". This controller will be responsible for displaying the list of products.

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 in 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 view:

@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 passed to the view using the "Model" property.

Step 6: Run the application

Press F5 to run the application. You should see a page that displays 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 more modular and maintainable application.

Conclusion

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 easy to implement in your applications. By using Dependency Injection, you can create more modular and maintainable applications that are easier to test and extend.

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Dependency Injection C#

What is Dependency Injection?

Dependency Injection in ASP.NET Core 6

Implementing Dependency Injection in ASP.NET Core 6

Conclusion

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