How to use Route Constraint and Attribute Routing together?

Question

I use Route Constraint in my website and Now I need to use Attribute Routing.

Route Constraint class:

public class BusConstraint : IRouteConstraint
    {
        private RouteDB routeDb = new RouteDB();


        public bool Match(HttpContextBase httpContext, Route route, string parameterName, RouteValueDictionary values, RouteDirection routeDirection)
        {
            if (values[parameterName] != null)
            {
                var permalink = values[parameterName].ToString();

                try
                {
                    List<AdakDbConnect.RouteTable> routeTables;
                    if (HttpContext.Current.Cache["RouteTables"] == null)
                    {
                        routeTables = routeDb.GetRouteTables(AdakDbDll.Username, AdakDbDll.Password);
                        HttpContext.Current.Cache.Add("RouteTables", routeTables, null, DateTime.Now.AddMinutes(45), TimeSpan.Zero, CacheItemPriority.Normal, null);
                    }
                    else
                    {
                        routeTables = HttpContext.Current.Cache["RouteTables"] as List<AdakDbConnect.RouteTable>;
                    }
                    RouteTable Route = routeTables?.FirstOrDefault(p => p.Link == permalink && p.Controlller == "Bus");
                    if (Route != null)
                    {
                        return true;
                    }
                }
                catch (System.Exception)
                {

                }


                return false;
            }
            return false;
        }
    }

For Attribute Routing use this code above action :

[Route("Bus")]
[Route("Bus/index")]
[Route("Bus/{From:int}/{To:int}/{Date:int}/{IsForeign:int:range(0,1)}/{Title}")]

Once of Attribute Routing and Route Constraint worked currently alone. But when I use together such as this case Attribute Routing worked Only and Route Constrain don't work.

RouteConfig :

    public static void RegisterRoutes(RouteCollection routes)
            {
                routes.MapMvcAttributeRoutes();

                routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

                //---------------------BusRoute---------------------------
                routes.MapRoute(
                name: "BusRoute",
                url: "{*permalink}",
                defaults: new { controller = "Bus", action = "Index" },
                constraints: new { permalink = new BusConstraint() },
                namespaces: new[] { "TravelEnterProject.Controllers" }
                );
}

How can I use Route Constraint and Attribute Routing together?

Answer 1

Routing will be work as you defined in RouteConfig File sequentially.

as per your RouteConfig.cs file

you defined routes.MapMvcAttributeRoutes(); --> for attribute routing and then you defined Conventional routing.

So if you used both the routing in your controller then only attribute routing will be work.

If you want to work as per conventional routing then change the sequence of def.

first define conventional routing routes.MapRoute() then routes.MapMvcAttributeRoutes();