Asp.Net路由:如何忽略多个通配符路由？

routes.MapRoute(
    name: "Default",
    url: "{controller}/{action}/{id}",
    defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional },
    constraints: new { controller = "^(?!blog).*" }
);

public class CustomRoute : RouteBase
{
    public override RouteData GetRouteData(HttpContextBase httpContext)
    {
        var data = new RouteData();
        var url = httpContext.Request.Path.ToLower();

        if (url.StartsWith("/blog"))
        {
            return null;
        }

        // 添加其他路由逻辑

        return data;
    }

    public override VirtualPathData GetVirtualPath(RequestContext requestContext, RouteValueDictionary values)
    {
        // 添加虚拟路径生成逻辑
    }
}

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

    routes.Add(new CustomRoute());
}