Why should you care?

Testable, maintainable ShopNest code depends on dependency injection.

See it live — copy this example

Create an MVC project (dotnet new mvc), add the code, and run dotnet run.

// Interface Injection — ShopNest.Mvc example
public class HomeController : Controller
{
    public IActionResult Index() => View();
}

Run Example »

Edit the code and click Run — like W3Schools Try it Yourself.

What happened?

• Study the example line by line.
• Each part connects to Interface Injection.
• Edit one line, save, and run dotnet run to see what changes.

Try it yourself

1. Register the service in Program.cs.
2. Inject the interface in a controller constructor.
3. Run the app and confirm the feature works.
4. Change text or labels in the example and run again — watch the browser update.
5. Break the code on purpose (remove a semicolon), read the error message, then fix it.

Remember

You learned what Interface Injection is and when to use it. Practice by changing the example yourself. Explain it in your own words before moving on.