I am a bit late to the party, but i have a working solution for this problem. Please find my detailed blog post on this issue here
I am writing down summary below
You need to create 2 files as given below
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Web.Http.Controllers;
using System.Web.Http.Routing;
namespace _3bTechTalk.MultipleRoutePrefixAttributes {
public class _3bTechTalkMultiplePrefixDirectRouteProvider: DefaultDirectRouteProvider {
protected override IReadOnlyList GetActionDirectRoutes(HttpActionDescriptor actionDescriptor, IReadOnlyList factories, IInlineConstraintResolver constraintResolver) {
return CreateRouteEntries(GetRoutePrefixes(actionDescriptor.ControllerDescriptor), factories, new [] {
actionDescriptor
}, constraintResolver, true);
}
protected override IReadOnlyList GetControllerDirectRoutes(HttpControllerDescriptor controllerDescriptor, IReadOnlyList actionDescriptors, IReadOnlyList factories, IInlineConstraintResolver constraintResolver) {
return CreateRouteEntries(GetRoutePrefixes(controllerDescriptor), factories, actionDescriptors, constraintResolver, false);
}
private IEnumerable GetRoutePrefixes(HttpControllerDescriptor controllerDescriptor) {
Collection attributes = controllerDescriptor.GetCustomAttributes (false);
if (attributes == null)
return new string[] {
null
};
var prefixes = new List ();
foreach(var attribute in attributes) {
if (attribute == null)
continue;
string prefix = attribute.Prefix;
if (prefix == null)
throw new InvalidOperationException("Prefix can not be null. Controller: " + controllerDescriptor.ControllerType.FullName);
if (prefix.EndsWith("/", StringComparison.Ordinal))
throw new InvalidOperationException("Invalid prefix" + prefix + " in " + controllerDescriptor.ControllerName);
prefixes.Add(prefix);
}
if (prefixes.Count == 0)
prefixes.Add(null);
return prefixes;
}
private IReadOnlyList CreateRouteEntries(IEnumerable prefixes, IReadOnlyCollection factories, IReadOnlyCollection actions, IInlineConstraintResolver constraintResolver, bool targetIsAction) {
var entries = new List ();
foreach(var prefix in prefixes) {
foreach(IDirectRouteFactory factory in factories) {
RouteEntry entry = CreateRouteEntry(prefix, factory, actions, constraintResolver, targetIsAction);
entries.Add(entry);
}
}
return entries;
}
private static RouteEntry CreateRouteEntry(string prefix, IDirectRouteFactory factory, IReadOnlyCollection actions, IInlineConstraintResolver constraintResolver, bool targetIsAction) {
DirectRouteFactoryContext context = new DirectRouteFactoryContext(prefix, actions, constraintResolver, targetIsAction);
RouteEntry entry = factory.CreateRoute(context);
ValidateRouteEntry(entry);
return entry;
}
private static void ValidateRouteEntry(RouteEntry routeEntry) {
if (routeEntry == null)
throw new ArgumentNullException("routeEntry");
var route = routeEntry.Route;
if (route.Handler != null)
throw new InvalidOperationException("Direct route handler is not supported");
}
}
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Http;
namespace _3bTechTalk.MultipleRoutePrefixAttributes
{
[AttributeUsage(AttributeTargets.Class, AllowMultiple = true, Inherited = true)]
public class _3bTechTalkRoutePrefix : RoutePrefixAttribute
{
public int Order { get; set; }
public _3bTechTalkRoutePrefix(string prefix) : this(prefix, 0) { }
public _3bTechTalkRoutePrefix(string prefix, int order) : base(prefix)
{
Order = order;
}
}
}
Once done, open WebApiConfig.cs and add this below given line
config.MapHttpAttributeRoutes(new _3bTechTalkMultiplePrefixDirectRouteProvider());
That's it, now you can add multiple route prefix in your controller. Example below
[_3bTechTalkRoutePrefix("api/Car", Order = 1)]
[_3bTechTalkRoutePrefix("{CountryCode}/api/Car", Order = 2)]
public class CarController: ApiController {
[Route("Get")]
public IHttpActionResult Get() {
return Ok(new {
Id = 1, Name = "Honda Accord"
});
}
}
I have uploaded a working solution here
Happy Coding :)
