如何在RouteConfig文件中实现扩展路由的路由而不产生路由错误

using System.Web.Mvc;
using System.Web.Routing;

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

            // 自定义路由规则
            routes.MapRoute(
                name: "ExtendedRoute",
                url: "{controller}/{action}/{id}/{category}",
                defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional, category = UrlParameter.Optional }
            );

            // 默认路由规则
            routes.MapRoute(
                name: "Default",
                url: "{controller}/{action}/{id}",
                defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
            );
        }

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

            // 自定义路由规则
            routes.MapRoute(
                name: "ExtendedRoute",
                url: "{controller}/{action}/{id}/{category}",
                defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional, category = UrlParameter.Optional }
            );

            // 默认路由规则
            routes.MapRoute(
                name: "Default",
                url: "{controller}/{action}/{id}",
                defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
            );
        }
    }
}