找不到网址路由后

Question

我正在使用Asp.net 3.5，我想在项目中使用URL路由 在global.asax中，我给出了这样的代码

protected void Application_Start(object sender, EventArgs e)
      {
          RegisterRoutes(RouteTable.Routes);
      }

      void RegisterRoutes(RouteCollection routes)
      {

          routes.Clear();
          routes.Add(
              "Blogcat",
              new Route("{Category}", new PostRouteHandler())

          );
      }

      protected void Session_Start(object sender, EventArgs e)
      {

          RegisterRoutes(RouteTable.Routes);
      }

PostRouteHandler.cs文件，我给出这样的代码

public class Helpers
{

    public static string FormatProductUrl(string Category)
    {
        return RouteTable.Routes.GetVirtualPath(null, "Blogcat", new RouteValueDictionary { { "Category", Category } }).VirtualPath;
    }


    public static IHttpHandler GetNotFoundHttpHandler()
    {
        return BuildManager.CreateInstanceFromVirtualPath("~/NotFound.aspx", typeof(Page)) as Page;
    }
}
public class PostRouteHandler : IRouteHandler
{

    public IHttpHandler GetHttpHandler(RequestContext requestContext)
    {
        string Category = requestContext.RouteData.Values["Category"] as string;


        if (string.IsNullOrEmpty(Category))
            return Helpers.GetNotFoundHttpHandler();
        else
        {

            if (Category == null)
                return Helpers.GetNotFoundHttpHandler();
            else
            {


                HttpContext.Current.Server.UrlEncode(Category);


                return BuildManager.CreateInstanceFromVirtualPath("~/Default.aspx", typeof(Page)) as Page;
            }
        }
    }

当我要提供Url http://localhost:63645/BlogCat/123时 它显示未找到URL。请帮助我，我的代码有什么问题。