using System;

​

public class DependencyInjectionDemo

{

    // Interface definition for a service

    public interface IMessageService

    {

        void SendMessage(string message);

    }

​

    // Implementation of the service

    public class EmailService : IMessageService

    {

        public void SendMessage(string message)

        {

            Console.WriteLine($"Email sent: {message}");

        }

    }

​

    // Class that depends on IMessageService

    public class NotificationManager

    {

        private readonly IMessageService _messageService;

​

        // Constructor injection

        public NotificationManager(IMessageService messageService)

        {

            _messageService = messageService;

        }

​

        public void Notify(string message)

        {

            _messageService.SendMessage(message);

        }

    }

​

    // Main program to demonstrate DI

    class Program

    {

        static void Main(string[] args)

        {

            // Injecting the dependency

            IMessageService emailService = new EmailService();

            NotificationManager notificationManager = new NotificationManager(emailService);

​

            // Using the notification manager

            notificationManager.Notify("Hello, Dependency Injection!");

        }

    }

}