weakly typed MapServiceRoute method for webapi

CustomRouteCollectionExtensions

using System.Linq;
using Microsoft.ApplicationServer.Http;
using Microsoft.ApplicationServer.Http.Activation;

namespace System.Web.Routing
{
    public static class CustomRouteCollectionExtensions
    {
        public static void MapServiceRoute(this RouteCollection routes, Type serviceType, string routePrefix, HttpConfiguration configuration = null, object constraints = null, bool useMethodPrefixForHttpMethod = true)
        {
            if (routes == null)
                throw new ArgumentNullException("routes");
            
            if (configuration == null)
                configuration = routes.GetDefaultHttpConfiguration();
            
            var serviceHostFactory = new HttpServiceHostFactory {Configuration = configuration};

            var webApiRoute = new WebApiRoute(routePrefix, serviceHostFactory, serviceType)
                                  {Constraints = new RouteValueDictionary(constraints)};
            
            routes.Add(webApiRoute);
        }
    }
}