I need to get the controller name from my route and this I can do if using standard routing code in WebApiConfig.

However, if I am using routing attributes it starts to get a little difficult, especially when trying to version.

Example: If I call an api/terms/bonuses and I have a BonusController and BonusV2Controller and a BonusV3Controller, this code returns the latest controller version 3. That's ok, I can live with that returning the latest and greatest version as a default.

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

var actions = (ReflectedHttpActionDescriptor[])subRouteData.Route.DataTokens["actions"];
//This seems to get latest controller name. ie. V2
controllerName = actions[0].ControllerDescriptor.ControllerName;

```

Now if I request a version 1, for simplicity I'll use a querystring and call api/terms/bonuses?v=2

So this code no longer works (obviously). 

How do I get the V2 controller name?

If I abandon routing attributes and just use WebApiConfig routing, this code works happily.

```
HttpControllerDescriptor controllerDescriptor = null; 
var controllers = GetControllerMapping();
var routeData = request.GetRouteData();
var controllerName = (string)routeData.Values["controller"];

```

UPDATE:

Here is my full selector code.

```
IDictionary<string, HttpControllerDescriptor> controllers = GetControllerMapping();                                             

var attributedRoutesData = request.GetRouteData().GetSubRoutes();
var subRouteData = attributedRoutesData.LastOrDefault(); //LastOrDefault() will get PeopleController, FirstOrDefault will get People{version}Controller which we don't want

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

//For controller name without attribute routing
//var controllerName = (string)routeData.Values["controller"];

HttpControllerDescriptor oldControllerDescriptor;
if (controllers.TryGetValue(controllerName, out oldControllerDescriptor))
{
    //TODO: Different techniques for handling version api requests.
    var apiVersion = GetVersionFromQueryString(request);
    //var version = GetVersionFromHeader(request);
    //var version = GetVersionFromAcceptHeaderVersion(request);
    //var version = GetVersionFromMediaType(request);

    if (!String.IsNullOrEmpty(apiVersion))
    {
        var newControllerName = String.Concat(controllerName, "V", apiVersion);

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

```