How do I use dependency injection in C#

Dependency Injection (DI) is a design pattern used to implement IoC (Inversion of Control), allowing for better modularity and testability in applications. In C#, there are various ways to implement dependency injection, including Constructor Injection, Setter Injection, and Interface Injection.

Example of Dependency Injection in C#

Below is a simple example demonstrating Constructor Injection in C#:


        // Interface
        public interface IMessageService
        {
            void SendMessage(string message);
        }

        // Implementation of the interface
        public class EmailService : IMessageService
        {
            public void SendMessage(string message)
            {
                Console.WriteLine("Email sent: " + message);
            }
        }

        // Consumer class
        public class UserController
        {
            private readonly IMessageService _messageService;

            // Constructor Injection
            public UserController(IMessageService messageService)
            {
                _messageService = messageService;
            }
            
            public void NotifyUser(string message)
            {
                _messageService.SendMessage(message);
            }
        }

        // Usage
        public class Program
        {
            public static void Main(string[] args)
            {
                IMessageService emailService = new EmailService();
                UserController userController = new UserController(emailService);
                
                userController.NotifyUser("Hello, Dependency Injection!");
            }
        }

How do I use dependency injection in C#

Example of Dependency Injection in C#

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How do I use dependency injection in C#

Example of Dependency Injection in C#

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