MVC API controller error with dependency injection

Question

i have a simple controller where i am using the interfaec like this ,

public class HomeController : Controller
{
    // GET: Home
    private IHotelService hotelService;
    public HomeController(IHotelService _hotelService)
    {
        hotelService = _hotelService;
    }
}

its working fine, but when i use same thing with API controller like

public class RoomController : BaseApiController
{
    private IHotelService hotelService;
    public RoomController(IHotelService _hotelService)
    {
        hotelService = _hotelService;
    }

it gives me error

An error occurred when trying to create a controller of type 'RoomController'. Make sure that the controller has a parameterless public constructor. — Gaurav shukla
– Gaurav shukla, Commented Feb 3, 2018 at 8:29
If you read here then you can understand that why that error message is msdn.microsoft.com/en-us/library/… Create a constructor without any parameter. — Satish Patel
– Satish Patel, Commented Feb 3, 2018 at 8:31
How are your injecting the service? What DI framework are you using? — user3559349
– user3559349, Commented Feb 3, 2018 at 8:36
i am using ninject web common for DI , and its working fine with normal web controller but not with api controller that is the actual problem — Gaurav shukla
– Gaurav shukla, Commented Feb 3, 2018 at 9:45

NightOwl888 · Accepted Answer · 2018-02-03 10:20:40Z

2

As pointed out here (and in several other answers on SO), you have most likely not registered your DI container with Web API. Web API is a separate framework than MVC and therefore it has a separate configuration, including dependency injection.

So, you need to set

GlobalConfiguration.Configuration.DependencyResolver = MyDependencyResovler(container);

at application startup. The details of how to do this depend on what container you are actually using and whether you use a stock dependency resolver or roll your own as shown in Dependency Injection in ASP.NET Web API 2.

answered Feb 3, 2018 at 10:20

NightOwl888

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