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;

I believe there is no other simpler way that I am aware of. Just fyi...a small improvement, you can do request.GetRouteData().GetSubRoutes() to get list attribute routes... — Kiran
– Kiran, Commented Oct 23, 2013 at 17:42
By the way, Can you describe what your scenario is? I am curious to know how you intend to use custom controller selector with attribute routing. — Kiran
– Kiran, Commented Oct 23, 2013 at 17:48
@KiranChalla Thanks for the suggestion. I've explained my scenario and added the remaining code so please take a look and correct me if i'm doing anything wrong. — Matija Grcic
– Matija Grcic, Commented Oct 24, 2013 at 6:55
@KiranChalla can you take a look at stackoverflow.com/questions/19835015/… — Matija Grcic
– Matija Grcic, Commented Nov 8, 2013 at 15:02
Curiously, DefaultHttpControllerSelector has a GetControllerName method that also fails on sub routes. — Jamie Ide
– Jamie Ide, Commented Mar 30, 2014 at 18:34

Matija Grcic · Accepted Answer · 2013-10-24 07:53:27Z

14

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;

answered Oct 24, 2013 at 7:53

Matija Grcic

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2 Comments

Matija Grcic Over a year ago

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

BitMask777 Over a year ago

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.

Ali CAKIL · Accepted Answer · 2022-09-04 10:16:09Z

0

its old ticket but i get controller name this way,

 var ControllerName = context.Request.RouteValues.Keys.FirstOrDefault();

answered Sep 4, 2022 at 10:16

Ali CAKIL

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