routes.MapRoute(name: "Default1",url: "more_{root}_{plate}.html",defaults: new { controller = "about", action = "Index", root = UrlParameter.Optional, plate = UrlParameter.Optional });

<a href="@Url.Action("index", "about", new { root = 1, plate = 2 })">123456</a>

<p>root: @(Url.RequestContext.RouteData.Values["root"])</p><p>plate: @(Url.RequestContext.RouteData.Values["plate"]) </p>

            /***********************RouteFourth路由控制**************************/            routes.MapRoute(                name: "RouteFourth2",                url: "fourth",                defaults: new { controller = "RouteFourth", action = "Index" }                );            routes.MapRoute(                name: "RouteFourth3",                url: "RouteFourth/{id}.html",                defaults: new { controller = "RouteFourth", action = "GetID", id = 1 },                constraints: new { id = @"\d+" }                );            routes.MapRoute(                name: "RouteFourth4",                url: "RouteFourth/name{name}",                defaults: new { controller = "RouteFourth", action = "GetName", name = "空" },                constraints: new { name = @"\w+" }                );            routes.MapRoute(                name: "RouteFourth1",                url: "RouteFourth.",//对于以‘.‘结尾的，直接报错，不会到路由匹配这一步                defaults: new { controller = "RouteFourth", action = "Index" }                );            routes.MapRoute(                    name: "RouteFourth11",                    url: "RouteFourth.html",                    defaults: new { controller = "RouteFourth", action = "Index" }                    );            routes.MapRoute(                    name: "RouteFourth111",                    url: "RouteFourth{ext}",                    defaults: new { controller = "RouteFourth", action = "Index" },                    constraints: new { ext=@"(.abc)|(.htm)"}                    );