Getting “No type was found that matches the controller named 'SampleSlashBaseService'” when trying to use WebAPI

Question

I have a webapi project with a base ApiController named SlashBaseService:

[RouteArea(\"uBase\")]
public abstract class SlashBaseService : ApiController
{
}
<         


        

Answer 1

In my case, there were two controllers with the same name, in different folders. Renaming them solved the problem instantly.

Answer 2

Found the problem.

ApiControllers class names need to be suffixed with "Controller", and mine was not. Changing it to SampleSlashBaseController solved the problem.

NOTE: It is possible to suffix it with "Service" as I did, but then you have to implement a custom IHttpControllerSelector like described here: http://netmvc.blogspot.no/2012/06/aspnet-mvc-4-webapi-support-areas-in.html

Answer 3

In my case the Controller was defined properly, but was not marked public.

Answer 4

You also need to make sure the Controller class is Public

Answer 5

For what it's worth, I ran into this and my problem was my manually-added class wasn't inheriting from ApiController. The class definition needs to be public class QueueController : ApiController not public class QueueController. What a dumb thing to overlook.