asp.net TreeView递归循环子节点生成树形菜单实例

/// <summary>/// 生成根节点/// </summary>/// <param name="treeview"></param>protected void BindTreeView(long ID, TreeView treeview){    DataTable dt = menuLogic.GetMenu2(ID, User.Identity.Name);    treeview.Nodes.Clear();    DataRow[] parentrow = dt.Select("par_id=0");    for (int i = 0; i < parentrow.Length; i++)    {      TreeNode rootnode = new TreeNode();      rootnode.Text = parentrow[i]["node_name"].ToString(); //parentrow[i][3].ToString();      rootnode.Value = parentrow[i]["ID"].ToString(); //parentrow[i][1].ToString(); 主键      rootnode.Expanded = true;      rootnode.Selected = false;      rootnode.SelectAction = TreeNodeSelectAction.None;      treeview.Nodes.Add(rootnode);      CreateChildNode(rootnode, dt); //    }}/// <summary>/// 生成子节点/// </summary>/// <param name="parentNode"></param>/// <param name="datatable"></param>protected void CreateChildNode(TreeNode parentNode, DataTable datatable){    DataRow[] rowlist = datatable.Select("par_id=" + parentNode.Value);    for (int i = 0; i < rowlist.Length; i++)    {      TreeNode node = new TreeNode();      if (datatable.Select("par_id=" + rowlist[i]["ID"].ToString().Trim()).Length > 0)      {        node.Text = rowlist[i]["node_name"].ToString();        node.Value = rowlist[i]["ID"].ToString();      }      else      {        node.Text = "<a href=/"javascript:;/" onclick=/"OpenUrl('" + rowlist[i]["url"].ToString().Trim() + "',this)/">" + rowlist[i]["node_name"].ToString() + "</a>";        node.Value = rowlist[i]["ID"].ToString();      }      node.Expanded = false;      node.Selected = false;      node.SelectAction = TreeNodeSelectAction.None;      parentNode.ChildNodes.Add(node);      CreateChildNode(node, datatable); //递归调用    }}