No parameterless constructor defined for this object. MVC 5

Question

I have a problem when i try to code with .NET Framework(4.7.2) and EF Core(3.0) because usually i use .NET Core. When i try to inject Repository(by its interface).

This is my code

SenderController.cs

public class SenderController : Controller
{
    private readonly ISenderRepository _sRepo;
    public SenderController(ISenderRepository sRepo)
    {
        _sRepo = sRepo;
    }

    public ActionResult Index()
    {
        return View();
    }

ISenderRepository.cs

 public interface ISenderRepository
{
    ICollection<Sender> GetSenders();
    Sender GetSender(int senderId);
    bool SenderExists(string name);
    bool SenderExists(int id);
    bool CreateSender(Sender sender);
    bool UpdateSender(Sender sender);
    bool DeleteSender(Sender sender);
    bool Save();
}

and this is what i get

i think i do wrong way for dependency injection in MVC 5. Can you help me to do that? Thank you :)

Answer 1

I just fixing it by using this statement in constructor :

private ISenderRepository _sRepo;
    public SenderController()
    {
        this._sRepo = new SenderRepository(new Data.ApplicationDbContext());
    }

Thanks

Answer 2

确保你必须注入你的控制器，你可以使用 Autofac 来帮助你