Dependency injection in c# with an example

Dependency injection (DI) is a design pattern commonly used in software development, particularly in object-oriented languages like C#. It promotes loose coupling and modularization by allowing objects to depend on abstractions rather than concrete implementations. This makes code more flexible, maintainable, and testable. In C#, you can implement dependency injection in various ways, such as constructor injection, property injection, or method injection.

1. Constructor injection:

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

// Concrete implementation of the dependency
public class EmailService : IMessageService
{
    public void SendMessage(string message)
    {
        Console.WriteLine($"Sending email: {message}");
    }
}

// Class that depends on the IMessageService
public class NotificationService
{
    private readonly IMessageService _messageService;

    // Constructor injection
    public NotificationService(IMessageService messageService)
    {
        _messageService = messageService;
    }

    public void SendNotification(string message)
    {
        _messageService.SendMessage(message);
    }
}

// Usage example
public class Program
{
    public static void Main()
    {
        // Create an instance of the dependency
        IMessageService emailService = new EmailService();

        // Create an instance of the class with the dependency injected
        NotificationService notificationService = new…