@ Html.ActionLink and Url.Action are not taking the route of the controller annotation

I have the following method in the control:

[Route("video/categoria/{categoria}/{page?}/{sort?}")]
public async Task<ActionResult> Index(string categoria, int? page, string sort)
{
...  
}

My RouteConfig.cs:

public static void RegisterRoutes(RouteCollection routes)
{
  routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

  routes.MapMvcAttributeRoutes();

  routes.MapRoute(
    name: "Default",
    url: "{controller}/{action}/{id}",
    defaults: new { controller = "Categoria", action = "Index", id = UrlParameter.Optional }
  );

}

My URL.Action:

Url.Action("Index","Video", new { categoria = @Request.QueryString["categoria"], page = 5, sort = ViewBag.CurrentSort})

Result of URL.Action: http://localhost:59278/Video?categoria=desenho&page=4

Expected result of Url.Action: http://localhost:59278/video/categoria/desenho/4

My Html.ActionLink:

@Html.ActionLink("Teste", "Index", "Video", new { categoria = @Request.QueryString["categoria"], page = 1, sort = "teste" }, null))

Html.ActionLink Result:

http://localhost:59278/Video?categoria=desenho&page=1&sort=teste

Expected result in Html.ActionLink:

http://localhost:59278/video/categoria/desenho/1/teste

How do you turn the result into the expected result?

UPDATE

It works the following were:

@Html.ActionLink("Teste", "Index", "Video", new { categoria = 1, page = 1, sort = 1 }, null)

So I believe that reducing the margin of places where the problem might be to the fourth parameter of the constructor.

UPDATE

After checking new possibilities I saw that the problem is @Request.QueryString["categoria"] , when used it does not do the URL correctly, but when I take it out and play a string or int in place it works normally.

What is the reason for this?

UPDATE

Another attempt did not work, but I discovered that you can not actually use any variables in the parameter:

@{ 
    var cat = @Request.QueryString["categoria"];
}

@Html.ActionLink("Teste", "ConsultaVideo", "Video", new { categoria = cat, page = 1, sort = "teste" }, null)