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Amrith Chandran
Amrith Chandran

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1 Answers

Anubhav Sharma
Anubhav Sharma 01 May 2026
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Creating a service in .NET Core (now commonly referred to as .NET) typically means building a reusable class and registering it with the built-in Dependency Injection (DI) system.

Here’s a clean, practical way to do it:

1. Create a Service Interface

Define a contract for your service.

public interface IEmailService
{
    string SendEmail(string to, string message);
}

2. Implement the Service

Create a class that implements the interface.

public class EmailService : IEmailService
{
    public string SendEmail(string to, string message)
    {
        // Simulate email sending
        return $"Email sent to {to} with message: {message}";
    }
}

3. Register the Service in DI Container

In Program.cs (for .NET 6+):

var builder = WebApplication.CreateBuilder(args);

// Register service
builder.Services.AddScoped<IEmailService, EmailService>();

var app = builder.Build();

Service Lifetimes:

  • AddTransient → New instance every time
  • AddScoped → One per request
  • AddSingleton → Single instance for entire app

4. Use the Service in Controller

public class HomeController : Controller
{
    private readonly IEmailService _emailService;

    public HomeController(IEmailService emailService)
    {
        _emailService = emailService;
    }

    public IActionResult Index()
    {
        var result = _emailService.SendEmail("test@mail.com", "Hello!");
        return Content(result);
    }
}

5. (Optional) Use in Minimal API

app.MapGet("/send", (IEmailService emailService) =>
{
    return emailService.SendEmail("user@test.com", "Hi from API");
});

Key Concept

This uses Dependency Injection, which is a core concept in ASP.NET Core. It helps:

  • Keep code loosely coupled
  • Improve testability
  • Make your app scalable

Pro Tips (Production Level)

Since you're working on large-scale systems:

  • Use interfaces always (for mocking/testing)
  • Add logging via ILogger<T>
  • Keep services stateless
  • Split into layers: Service → Repository → DB
  • Use async methods for I/O operations
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