asp.net-mvc-3 – Url.RouteUrl返回空

在视图中,我这样称呼：

alert('@Url.RouteUrl("Api",new { controller = "Parametros",id = "" })');

这是我的路线配置：

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

    routes.MapHttpRoute(
        name: "Api",routeTemplate: "api/{controller}/{id}",defaults: new { id = RouteParameter.Optional }
    );

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

和我的控制器：

public class ParametrosController : ApiController
{
    ISistemaService _sistemaService;
    public ParametrosController(Empresa empresa,ISistemaService sistemaService)
    {
        _sistemaService = sistemaService;
    }


    public PagedDataModel<ParametroDTO> Get(
        [FromUri]ParametroFiltro filter,int page,int pageSize)
    {
        int total = 0;
        var list = _sistemaService.Paging(filter,page,pageSize,out total);
        return new PagedDataModel<ParametroDTO>(page,total,list);
    }

    public ParametroDTO Get(string codigo)
    {
        return _sistemaService.GetParametroPorCodigo(codigo);
    }
}