Dependency Injection in C#

Question

Pankajkumar Patel · Answer

Hi Boobalan Thiyagarajan, Dependency Injection (DI) in C# is a design pattern where one passes dependencies into class instead of class creating them itself. Example - without DI public class OrderService { private readonly EmailSender _emailSender = new EmailSender(); // tightly coupled } Example - with DI public class OrderService { private readonly IEmailSender _emailSender; public OrderService(IEmailSender emailSender) { _emailSender = emailSender; } } Here, OrderService depends on interface (IEmailSender), which makes it easier to test and swap implementations. Advantages : Looser coupling Easier maintenance Clear dependency graph Better testability Below is one of the best article with complete reference about Dependency Injection in C# Understanding Dependency Injection (DI) in .NET Core with Simple Examples Glad to help! Please mark this answer as the accepted answer if it helped you out!

Cynthia Sathuragiri · Answer

Dependency Injection (DI) in C# is a simple way to provide an object with the things it needs instead of creating them inside the class itself. For example, without DI, we might write: class OrderService { private EmailService emailService = new EmailService(); public void PlaceOrder() { emailService.SendEmail(); } } Here, OrderService creates its own EmailService , so both classes are tightly connected. With Dependency Injection, we can do this: class OrderService { private readonly EmailService emailService; public OrderService(EmailService emailService) { this.emailService = emailService; } public void PlaceOrder() { emailService.SendEmail(); } } Now EmailService is passed into OrderService from outside. This makes the code easier to test and maintain. If we want to replace EmailService with another implementation later, we can do that without changing OrderService . In simple words, Dependency Injection means “don’t create the dependency yourself let someone else provide it to you.” ASP.NET Core has built-in support for DI, which makes this approach very easy to use.

Dependency Injection in C#

Insert Link

Embed YouTube Video

Table Options

Insert Image

Answers (2)