CustomConstraint.cs

using System.Collections.Generic;
using System.Net.Http;
using System.Web.Http.Routing;
 
namespace WebApiApp.Util
{
    public class CustomConstraint: IHttpRouteConstraint 
    {
        private string uri;
        public CustomConstraint(string uri)
        {
            this.uri = uri;
        }
        public bool Match(HttpRequestMessage request, IHttpRoute route, string parameterName,  
            IDictionary<string, object> values, HttpRouteDirection routeDirection) 
        {
            return !(uri == request.RequestUri.AbsolutePath);
        }
    }
}