No HTTP resource was found that matches the request URI in Web API

Question

I have configured my WebApiConfig like this:

public static void Register(HttpConfiguration config)
{
    config.Routes.MapHttpRoute(
        name: \"DefaultApi\"         


        

Answer 1

config.Routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "api/{controller}/{action}/{id}",
            defaults: new { id = RouteParameter.Optional }
        );

Maps to:

http://localhost:8598/api/Controller/Action/id

The WebApi portion of the url is redundant with api. Then modify the method parameter name to match the route:

public IEnumerable GetLocationCategory(int id)

This is a good default as it matches the convention.

Alternatively, you can modify the route to use this unconventional parameter name instead:

config.Routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "api/{controller}/{action}/{CatID}",
            defaults: new { CatID = RouteParameter.Optional }
        );

Finally, in either case make sure the controller name ends in Controller.

Good names: CustomController, CustomApiController
Bad names: Custom, CustomApi