TreeView控件例子

时间：2023-12-20 19:05:26

XmL文件代码：

<?xml version="1.0" encoding="utf-8" ?>

<Area>

  <Province  iAreaID="" cAreaName="北京市"/>

  <Province iAreaID="" cAreaName="上海市"/>

  <Province iAreaID="" cAreaName="天津市"/>

  <Province iAreaID="" cAreaName="重庆市"/>

  <Province iAreaID="" cAreaName="湖北省">

  <City iAreaID="" cAreaName="武汉市"/>

  <City iAreaID="" cAreaName="黄冈市"/>

  <City iAreaID="" cAreaName="荆州市"/>

  <City iAreaID="" cAreaName="武穴市"/>

  <City iAreaID="" cAreaName="十堰市"/>

  <City iAreaID="" cAreaName="黄石市"/>

 </Province>

  <Province iAreaID="" cAreaName="河北省">

    <Province  iAreaID="" cAreaName="石家庄市"/>

    <Province iAreaID="" cAreaName="唐山市"/>

  </Province>

  <Province iAreaID="" cAreaName="山西省">

    <Province  iAreaID="" cAreaName="太原市"/>

    <Province iAreaID="" cAreaName="大同市"/>

  </Province>

</Area>

aspx前代码：

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

    <title></title>

</head>

<body>

    <form id="form1" runat="server">

    <div>

     <asp:TreeView ID="treeAreaList" runat="server"

     AutoGenerateDataBindings="false" OnSelectedNodeChanged="Tree_SelectedNodeChanged"></asp:TreeView>

    </div>

    </form>

</body>

</html>

CS代码：

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Xml;

namespace WebApplication1.复合控制和模板页

{

    public partial class TreeView控件 : System.Web.UI.Page

    {

        XmlDocument xmlDoc;

        protected void Page_Load(object sender, EventArgs e)

        {

            if (!Page.IsPostBack)

            {

                MakeParentNode();

            }

        }

            #region

         protected void MakeParentNode()

            {

             treeAreaList.Nodes.Clear();

             xmlDoc=new XmlDocument();

             xmlDoc.Load(Server.MapPath("area.xml "));//动态加载xml文档

             XmlNodeList nodeList=xmlDoc.SelectSingleNode("Area").ChildNodes;//获取子节点

             //定义Area节点

             TreeNode topNode=new TreeNode();//定义*节点

             topNode.Text="area";

             //tn.Value="-1";

             topNode.Expanded=true;

             treeAreaList.Nodes.Add(topNode);//添加”区域“父节点

             XmlElement element=null;

             TreeNode treeNode=null;

             //遍历区域下的所有省和直辖市

             foreach (XmlNode node in nodeList)

             {

                 element=(XmlElement)node;

                 treeNode=new TreeNode();

                 treeNode.Text=element.GetAttribute("cAreaName");

                 //在树控件上显示省或直辖市

                 treeNode.Value=element.GetAttribute("iAreaID");

                 //获取节点值

                 treeNode.Expanded=true;

                 topNode.ChildNodes.Add(treeNode);

                 MakeChildNode(node.ChildNodes,treeNode);

             }

            }

                #endregion

                #region

         protected void MakeChildNode( XmlNodeList nodeList,TreeNode treeNode)

         {

             XmlElement element = null;

             TreeNode subTreeNode = null;

             foreach (XmlNode node in nodeList)

             {

                 element = (XmlElement)node;

                 subTreeNode = new TreeNode();

                 subTreeNode.Text = element.GetAttribute("cAreaName");

                 //在树控件上显示省或直辖市

                 subTreeNode.Value = element.GetAttribute("iAreaID");

                 //获取节点值

                 subTreeNode.Expanded = true;

                 treeNode.ChildNodes.Add(subTreeNode);

                 MakeChildNode(node.ChildNodes, subTreeNode);

             }

         }

            #endregion

        protected void Tree_SelectedNodeChanged(object sender, EventArgs e)

        {

            Response.Write("节点的值：" + treeAreaList.SelectedNode.Value + "<br/>");

            Response.Write("节点的路径：" + treeAreaList.SelectedNode.ValuePath + "<br/>");

            Response.Write("节点的数据路径：" + treeAreaList.SelectedNode.DataPath + "<br/>");

        }

    }

}

显示效果：

TreeView控件例子

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