DTCMS自定义标签，获取所有栏目以及获得子栏目导航

  /// <summary>
        /// 返回类别列表
        /// </summary>
        /// <param name="parent_id">父类别ID</param>
　　　　 /// <param name="channel_id">频道ID</param>
        /// <returns>DataTable</returns>
        protected DataTable get_category_list(int parent_id, string channel_id)
        {
            return new BLL.article_category().GetList(parent_id, int.Parse(channel_id));
        }

  <ul id="navigation">
    <li><a href="<%linkurl("index")%>">网站首页</a></li>
   <%set DataTable categorylist=get_category()%>
      <%loop category categorylist%>
         <li onmouseover="displaySubMenu(this)" onmouseout="hideSubMenu(this)">
         <a href="{category[name]}/{category[name]}_index.html">{category[title]}</a>
         <ul>
      <%set DataTable arc_categorylist=get_category_list(0,{category[id]})%>
         <%loop arc_category arc_categorylist%>
        <li> <a href="/{category[name]}/list-{arc_category[id]}.html">{arc_category[title]}</a></li>
         <%/loop%>
         </ul>
         </li>
      <%/loop%>
      </ul>

 <script type="text/javascript">
     function displaySubMenu(li) {
         var subMenu = li.getElementsByTagName("ul")[0];
         subMenu.style.display = "block";
     }
     function hideSubMenu(li) {
         var subMenu = li.getElementsByTagName("ul")[0];
         subMenu.style.display = "none";
     }
</script>