How to set a controller method not to be routed using attribute routing

Question

I have applied a route attribute at the controller level, but I want to exclude an action from being routed. Not overriding but excluding the route completely. How can this be achieved?

Let's say I have:

[RoutePrefix("promotions")]
[Route("{action=index}")]
public class ReviewsController : Controller
{
    // eg.: /promotions
    public ActionResult Index() { ... }

    // eg.: /promotions/archive
    public ActionResult Archive() { ... }

    // eg.: /promotions/new
    public ActionResult New() { ... }

    // eg.: /promotions/edit/5
    [Route("edit/{promoId:int}")]
    public ActionResult Edit(int promoId) { ... }

    public void Internal() { ... }
}

and I want Internal not to be routed.

I would have expected to find a [DoNotRoute] or [Ignore] attribute, but I didn't find anything like that.

Answer 1

Use the [NonAction] attribute:

[NonAction]
public void Internal() { ... }