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<%@ Import Namespace="System.Web.Routing" %>
<%@ Import Namespace="System.Web.Compilation" %>

RegisterRoutes(RouteTable.Routes);

 public static void RegisterRoutes(RouteCollection routes)
    {
       //EX:網址為 http://xx.xx.xx/od/12345678 , 12345678 為可置換的內容 , 會對應到不網頁
        routes.Add(new Route("od/{gpo_no}", new OrderRouteHandler("~/order/order_look.aspx")));
    }
    public class OrderRouteHandler : IRouteHandler
    {
        private string virtualPath;

        public OrderRouteHandler(string virtualPath)
        {
            this.virtualPath = virtualPath;
        }

        public IHttpHandler GetHttpHandler(RequestContext requestContext)
        {
            //origquerystr 透過httpcontext 取出 gpo_no 值應用
            string origQueryStr = HttpContext.Current.Request.QueryString.ToString();
            string queryStr = "?gpo_no=" + requestContext.RouteData.Values["gpo_no"];

            if (!string.IsNullOrEmpty(origQueryStr))
                queryStr += "&" + origQueryStr;
            HttpContext.Current.RewritePath(string.Concat(virtualPath, queryStr));

            return BuildManager.CreateInstanceFromVirtualPath(virtualPath, typeof(Page)) as Page;
        }
    }