Get controller name

Question

In WebApiConfig.cs i have the following

public static void Register(HttpConfiguration config)
{

   config.MapHttpAttributeRoutes(); 

   config.Services.Replace(typeof(IHttpControllerSelector),
               new MyApiControllerSelector(config));

   //code omitted for brevity
}

then in the MyApiControllerSelector.cs i want to get the controller

public override HttpControllerDescriptor SelectController(HttpRequestMessage request)
        {           
            var routeData = request.GetRouteData();           

            var controllerName = (string)routeData.Values["controller"];

            //code omitted for brevity
        }

Pretty simple and it worked great but now using attribute routing i think it needs a different approach? - as i can't seem to find a simple way

I've tried

var controllerName = request.GetActionDescriptor().ControllerDescriptor.ControllerName;

which doesn't work.

Then reading the source with debugging lead me to request.GetRouteData().Values["MS_SubRoutes"]

So now I have

string subRoutesKey = "MS_SubRoutes";

var attributedRoutesData = routeData.Values[subRoutesKey] as IEnumerable<IHttpRouteData>; 
var subRouteData = attributedRoutesData.FirstOrDefault();

var actions = (ReflectedHttpActionDescriptor[])subRouteData.Route.DataTokens["actions"];
var controllerName = actions[0].ControllerDescriptor.ControllerName;

which works but it has to be a simpler way?

UPDATE

@KiranChalla asked what's my use case so i'm posting the remaining code. Basically i'm parsing version media type Accept: application/vnd.app.{resource}.v{version}+json from request and returning a HttpControllerDescriptor depending on the version.

            HttpControllerDescriptor oldControllerDescriptor;
            if (controllers.TryGetValue(controllerName, out oldControllerDescriptor))
            {
                var apiVersion = GetVersionFromMediaType(request);

                var newControllerName = String.Concat(controllerName, "V", apiVersion);

                HttpControllerDescriptor newControllerDescriptor;
                if (controllers.TryGetValue(newControllerName, out newControllerDescriptor))
                {                    
                    return newControllerDescriptor;
                }               
                return oldControllerDescriptor;
            }
            return null;

Solution

As confirmed by @KiranChalla there is no simpler way then the one I've already implemented, except the minor suggestion to use GetSubRoutes()

var attributedRoutesData = request.GetRouteData().GetSubRoutes();
var subRouteData = attributedRoutesData.FirstOrDefault();

var actions = (ReflectedHttpActionDescriptor[])subRouteData.Route.DataTokens["actions"];
var controllerName = actions[0].ControllerDescriptor.ControllerName;

Comments

[Matija Grcic]

@ainteger No, it's just a different approach to get the necessary data (controller name) from the pipeline.

[BitMask777]

The suggestion of using GetSubRoutes() is an excellent one. It's the approach I've taken because using MS_SubRoutes is reliance on an undocumented string literal that could easily change without warning in the future.