How do you inherit route prefixes at the controller class level in WebApi?

Question

Note, I\'ve read about the new routing features as part of WebApi 2.2 to allow for inheritance of routes. This does not seem to solve my particular issue, however. It seems

Answer 1

Tried this in ASP.NET Web Api 2.2 (should/might also work in MVC):

public class InheritedRoutePrefixDirectRouteProvider : DefaultDirectRouteProvider
{
    protected override string GetRoutePrefix(HttpControllerDescriptor controllerDescriptor)
    {
        var sb = new StringBuilder(base.GetRoutePrefix(controllerDescriptor));
        var baseType = controllerDescriptor.ControllerType.BaseType;

        for (var t = baseType; typeof(ApiController).IsAssignableFrom(t); t = t.BaseType)
        {
            var a = (t as MemberInfo).GetCustomAttribute(false);
            if (a != null)
            {
                sb.Insert(0, $"{a.Prefix}{(sb.Length > 0 ? "/": "")}");
            }
        }

        return sb.ToString();
    }
}

It links the route prefixes together in the controller inheritance chain.