/// <summary>
        /// 绑定导航栏
        /// </summary>
        void BindNavigator()
        {
            Expression <Func <Navigator, bool> > predicate      = n => n.Enabled && n.ParentID == ConstValue.EMPTY_GUID_STR;
            Expression <Func <Navigator, int> >  orderCondition = n => n.OrderNum;

            var source = NavigatorGeneration.GenerateNavSource(predicate, orderCondition);

            if (source != null && source.Count > 0)
            {
                rptNavigator.DataSource = source;
                rptNavigator.DataBind();
            }
        }
        protected void rptNavigator_ItemDataBound(object sender, RepeaterItemEventArgs e)
        {
            if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
            {
                //查找内嵌的Repeater
                var rptCategory = e.Item.FindControl("rptChildNav") as Repeater;

                var nav = e.Item.DataItem as Navigator;

                Expression <Func <Navigator, bool> > predicate      = n => n.Enabled && n.ParentID == nav.ID;
                Expression <Func <Navigator, int> >  orderCondition = n => n.OrderNum;

                var categories = NavigatorGeneration.GenerateNavSource(predicate, orderCondition);

                rptCategory.DataSource = categories;
                rptCategory.DataBind();
            }
        }