<div ><ul id="test" ><asp:Repeater ID="replist" runat="server" OnItemDataBound="replist_ItemDataBound"><ItemTemplate><li><a class="one" href="javascript:void()"><em><%# Eval("Name")%></em></a><ul style="display: none;"><asp:HiddenField ID="hfId" runat="server" Value='<%# Eval("ID") %>' /><asp:Literal ID="LitFirst" runat="server"></asp:Literal>    //这个标签用来替换数据</ul></li></ItemTemplate></asp:Repeater></ul></div><script src="../JS/jquery-1.11.0.min.js"></script><script>$("ul#test").on("click", "li", function () {//$("ul li ul").css("display", "none");if ($(this).hasClass("show")) {$("ul#test li").removeClass("show");Test();//$(this).removeClass("show");//  $(this).find("ul").css("display", "none");} else {$("ul#test li").removeClass("show");$(this).addClass("show");Test();//$(this).find("ul").css("display", "block");
                }});//用来隐藏和显示下面的数据function Test(){$("ul#test li").each(function () {if ($(this).hasClass("show")) {$(this).find("ul").css("display", "block");} else {$(this).find("ul").css("display", "none");}});}</script>

    <style>ul {list-style:none;}em {font-style: normal;}a {text-decoration:none;}</style>

 protected void Page_Load(object sender, EventArgs e){if (!IsPostBack){Binging();}}private void Binging(){DataSet ds = new FunctionDemo.BLL.Category().GetList("Pid=0");replist.DataSource = ds.Tables[0];replist.DataBind();}/// <summary>/// 每绑定一行就触发一次  一般这个方法用来加载每一行的子类数据/// </summary>/// <param name="sender"></param>/// <param name="e"></param>protected void replist_ItemDataBound(object sender, RepeaterItemEventArgs e){           Literal LitFirst = (Literal)e.Item.FindControl("LitFirst");HiddenField hfId = (HiddenField)e.Item.FindControl("hfId");List<FunctionDemo.Model.Category> cateModel = new FunctionDemo.BLL.Category().GetModelList("Pid=" + hfId.Value);foreach (FunctionDemo.Model.Category item in cateModel){LitFirst.Text = LitFirst.Text + "<li>"+item.Name+"</li>";}}

 <form id="form1" runat="server"><asp:DropDownList ID="ddlDemo" runat="server"></asp:DropDownList></form>

   public FunctionDemo.BLL.Category categoryBLL = new FunctionDemo.BLL.Category();protected void Page_Load(object sender, EventArgs e){if (!IsPostBack){BingDDL();}}public void BingDDL(){DataTable dt = categoryBLL.GetList("").Tables[0];       //categoryBLL.GetListChild(0, true);ddlDemo.Items.Add(new ListItem("类别", "0"));foreach (DataRow item in dt.Rows){string title = "";if (int.Parse(item["LevalNum"].ToString()) > 0){title =" " + "|--" + item["Name"].ToString();}else{title = item["Name"].ToString();}ddlDemo.Items.Add(new ListItem(title, item["ID"].ToString()));}}

  /// <summary>/// 获取全部类别/// </summary>/// <param name="strWhere">后面的bool值可以显示是否显示禁用的数据,这里并没做处理</param>/// <returns></returns>public DataTable GetListChild(int PID, bool isState){StringBuilder strSql = new StringBuilder();strSql.Append("select ID,Name,Pid,LevalNum");strSql.Append(" FROM Category ");//strSql.Append(" Where ParentId=" + PId);if (isState){strSql.Append("Where 1=1 ");}strSql.Append(" order by Id asc");DataSet ds = DbHelperSQL.Query(strSql.ToString());      我们的数据查找完了，跟以前是一样的DataTable oldData = ds.Tables[0] as DataTable;if (oldData == null){return null;}//复制结构DataTable newData = oldData.Clone();       clone()是基类Object的方法//调用迭代组合成DAGATABLE   用旧数据得到新数据
            GetChannelChild(oldData, newData, PID);return newData;}/// <summary>/// 获取子类别/// </summary>/// <param name="parentId">父编号</param>/// <param name="stateInfo">状态</param>/// <returns></returns>private void GetChannelChild(DataTable oldData, DataTable newData, int PId){//第一遍进来的时候是获取父类 pid=0      我们只需每取一条父类数据，然后把改类的子类数据先加载进去就可以了DataRow[] dr = oldData.Select("Pid=" + PId);for (int i = 0; i < dr.Length; i++){//添加一行数据 DataRow row = newData.NewRow();  row["ID"] = int.Parse(dr[i]["ID"].ToString());row["Name"] = dr[i]["Name"].ToString();row["Pid"] = dr[i]["Pid"].ToString();row["LevalNum"] = dr[i]["LevalNum"].ToString();               newData.Rows.Add(row);//调用自身迭代this.GetChannelChild(oldData, newData, int.Parse(dr[i]["ID"].ToString()));//把父类的ID作为条件传进去，子类的数据就会出来
            }}

   //创建一个新的DataTable，这里可以添加我们的列DataTable newData = new DataTable();newData.Columns.Add("id", typeof(int));newData.Columns.Add("parent_id", typeof(int));newData.Columns.Add("class_layer", typeof(int));newData.Columns.Add("nav_type", typeof(string));newData.Columns.Add("name", typeof(string));newData.Columns.Add("title", typeof(string));newData.Columns.Add("sub_title", typeof(string));newData.Columns.Add("icon_url", typeof(string));newData.Columns.Add("link_url", typeof(string));newData.Columns.Add("sort_id", typeof(int));newData.Columns.Add("is_lock", typeof(int));newData.Columns.Add("remark", typeof(string));newData.Columns.Add("action_type", typeof(string));newData.Columns.Add("is_sys", typeof(int));

             //调用迭代组合成DAGATABLE   用旧数据得到新数据GetChannelChild(oldData, newData, PID);return newData;

          //在GetChannelChild（）这个方法里面的添加数据里面就可以把新列的数据添加进去