c# - The route helper generates the wrong URL when using Route attributes -

i have controller use route attributes, see below:

[routeprefix("api/hello/product")] public class productcontroller : controller {      [route("productid:int}")]     public async task<actionresult> getproduct(int productid)     {}  } 

in view have this:

var url = '@url.routeurl(new { area="hello", controller = "product", action = "getproduct", productid = 123 })';  console.log(url); 

the output is:

/hello/product/getproduct?userid=123 

when should have been:

/api/hello/product/123 

is bug or url.route not work when use route attributes?