mvc 路由

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

            routes.MapRoute(
                name: "ad",
                url: "{controller}/{action}/sid{sid}/adid{adid}/{id}",
                defaults: new { controller = "Main", action = "Index", sid = UrlParameter.Optional,adid=UrlParameter.Optional,id = UrlParameter.Optional },
                constraints: new { sid = @"\d+" }
            );

            //routes.MapRoute(
            //    name: "share",
            //    url: "{controller}/{action}/sid{sid}/{id}",
            //    defaults: new { controller = "Main", action = "Index", sid = UrlParameter.Optional, id = UrlParameter.Optional },
            //    constraints: new { sid = @"\d+" }
            //);

            routes.MapRoute(
                name: "share",
                url: "{sid}/{controller}/{action}/{id}",
                defaults: new { controller = "Main", action = "Index1", sid = UrlParameter.Optional, id = UrlParameter.Optional },
                constraints: new { sid = @"\d+" }
            );

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

        public ActionResult Index1(int sid,Guid? id)
        {
            Response.Write(RouteData.GetRequiredString("sid").ToString());
            return Content(string.Format("<br/>sid={0}<br />id={1}<br />", sid, id));
        }