ASP.NET MVC Url.Action adds current route values to generated url

Question

I have seen this question a couple of times here in SO but none of them with any acceptable answer:

ASP.NET MVC @Url.Action includes current route data
ASP.NET M

Answer 1

Simple example:

public class ProductController : Controller
{
  public ActionResult Edit(int id)
  {
    return View();
  }

  [Route("Product/Detail/{id:int}")]
  public ActionResult Detail(int id)
  {
    return View();
  }
}

Edit view contains only this:

@{ Layout = null;}
@Url.Action("Detail", "Cmr")

So when you run your site e.g. localhost:randomPort/Product/Edit/123 you get next response: /Product/Detail/123

Why? Because Route attribute has required parameter id. Id parameter is read from url, although we wrote only Url.Action(methodName, controller) - without specifying parameter. Also it doesn't make sense to have a method detail without id.

In order for attributes to work next line must be added to RouteConfig.cs:

public static void RegisterRoutes(RouteCollection routes)
{
  ...
  routes.MapMvcAttributeRoutes();
  ...
}