将treeview绑定到dropdownlist中

protected void Page_Load(object sender, EventArgs e) { if(!IsPostBack){ bool isExpaned=false; string sSelectedData=""; TreeView tv=new TreeView(); BindCategoryTreeVew(tv,isExpaned,sSelectedData); } } public int RootID { set { ViewState["RootID"] = value; this.SiteID = RootID; } get { if (ViewState["RootID"] == null) { return -1; } else { return int.Parse(ViewState["RootID"].ToString()); } } } public int SiteID { get { if (ViewState["SiteID"] == null) { return -1; } else { return int.Parse(ViewState["SiteID"].ToString()); } } set { ViewState["SiteID"] = value; } } // /// <summary> /// 创建根节点 并绑定 /// </summary> /// <param name="treeView">树</param> /// <param name="isExpanded">是否展开节点</param> /// <param name="sSelectedData"> </param> public void BindCategoryTreeVew(TreeView treeView, bool isExpanded, string sSelectedData) { //将获取的数据转换为 一个DataTable DataTable dt = BLL.admin.SiteManager.SiteManager.GetSiteByParentSiteID(RootID); //清空 树的所有节点 treeView.Nodes.Clear(); foreach (DataRow dr in dt.Rows) { //创建根节点 TreeNode rootNode = new TreeNode(); //设置根节点的属性 rootNode.Text = dr["siteName"].ToString(); //设置根节点的值 rootNode.Value = dr["siteId"].ToString(); //获取或设置一个值，该值指示是否展开节点 rootNode.Expanded = isExpanded; //获取或设置一个值,该值指示是否选中节点 rootNode.Selected = true; //添加根节点 //treeView.Nodes.Add(rootNode); this.ddltext.Items.Add(new ListItem(rootNode.Text, rootNode.Value)); CreateChildNode(rootNode, dt, isExpanded, sSelectedData); } } /// <summary> /// 创建子节点 /// </summary> /// <param name="parentNode"></param> /// <param name="dt"></param> /// <param name="isExpanded"></param> /// <param name="sSelecedData"></param> private void CreateChildNode(TreeNode parentNode, DataTable dt, bool isExpanded, string sSelecedData) { //选择数据，添加排序表达式 string ualue = parentNode.Value; dt = BLL.admin.SiteManager.SiteManager.GetSiteByParentSiteID(int.Parse(dt.Rows[0]["siteId"].ToString())); foreach (DataRow row in dt.Rows) { //创建一个新的节点了 TreeNode node = new TreeNode(); node.Text = row["siteName"].ToString(); node.Value = row["siteId"].ToString(); node.Expanded = isExpanded; if (node.Value == sSelecedData) { node.Selected = true; } //parentNode.ChildNodes.Add(node); //子节点前加入两个空格 this.ddltext.Items.Add(new ListItem("　　" + node.Text, node.Value)); //递归调用，创建其他节点 CreateChildNode(node, dt, isExpanded, sSelecedData); } }                     

 

前台

 <div>
        <asp:DropDownList ID="ddltext" runat="server">
        </asp:DropDownList>
        <asp:TreeView ID="tvtext" runat="server">
        </asp:TreeView>
    </div>