<%@ Page Language="C#" AutoEventWireup="true" CodeFile="MSTreeView.aspx.cs" Inherits="MSTreeView" %><html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"> <title>TreeView一次性加载和异步加载</title></head><body> <form id="form1" runat="server"> <div> <asp:ScriptManager ID="ScriptManager1" runat="server"> </asp:ScriptManager> <asp:UpdatePanel ID="UpdatePanel1" runat="server"> <ContentTemplate> <table> <tr> <td style="width:200px; height:600px; vertical-align:top;"> 一次性加载<br /> <asp:TreeView ID="TreeView2" runat="server" ShowLines="true"> </asp:TreeView> </td> <td style="width:200px; height:600px; vertical-align:top;"> 异步加载<br /> <asp:TreeView ID="TreeView1" runat="server" ShowLines="true" OnTreeNodePopulate="TreeView1_TreeNodePopulate" EnableClientScript="true" ExpandDepth="0"> </asp:TreeView> </td> </tr> </table> </ContentTemplate> </asp:UpdatePanel> </div> </form></body></html>
using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Data;using System.Web.UI;using System.Web.UI.WebControls;public partial class MSTreeView : System.Web.UI.Page{ protected DataTable dt = createDT(); protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { //一次性加载 适用于小数据量 TreeView2.Nodes.Clear(); CreateLevelTreeView(TreeView2, dt, "module_name", "module_id", "module_fatherid"); TreeView2.ExpandAll(); //异步加载 适用于大数据量 TreeView1.Nodes.Clear(); DataView dv = dt.DefaultView; dv.RowFilter = " module_fatherid='0' "; Bind_Root(dv.ToTable(), "module_name", "module_id"); } } #region 异步加载TreeView /// <summary> /// 绑定父节点 /// </summary> /// <param name="dt">数据源</param> /// <param name="text">text</param> /// <param name="value">value</param> private void Bind_Root(DataTable dt,string text,string value) { TreeNode tn; for (int i = 0; i < dt.Rows.Count; i++) { tn = new TreeNode(); tn.Value = dt.Rows[i][value].ToString(); tn.Text = dt.Rows[i][text].ToString(); //判断是否有子节点 if (Check_Child(tn.Value)) { tn.PopulateOnDemand = true; tn.Expanded = false; } TreeView1.Nodes.Add(tn); } } /// <summary> /// 绑定节点的子节点 /// </summary> /// <param name="treeNode"></param> /// <param name="p"></param> private void Bind_Child(TreeNode treeNode, string fatherID, string text, string value) { TreeNode tn; DataRow[] drExist = dt.Select(" module_fatherid= '" + fatherID + "'"); for (int i = 0; i < drExist.Length; i++) { tn = new TreeNode(); tn.Value = drExist[i][value].ToString(); tn.Text = drExist[i][text].ToString(); //检验是否有子节点 if (Check_Child(tn.Value)) { tn.PopulateOnDemand = true; tn.Expanded = false; } treeNode.ChildNodes.Add(tn); } } /// <summary> /// 判断是否有子节点 /// </summary> /// <param name="pre_Val">父类ID</param> /// <returns></returns> private bool Check_Child(string pre_Val) { DataRow[] dr = dt.Select(" module_fatherid= '" + pre_Val + "'"); bool exist = (dr.Length > 0) ? true : false; return exist; } protected void TreeView1_TreeNodePopulate(object sender, TreeNodeEventArgs e) { Bind_Child(e.Node, e.Node.Value.ToString(), "module_name", "module_id"); } #endregion #region 一次性加载TreeView /// <summary> /// 创建无限分级目录树TreeView /// </summary> /// <param name="treeview">TreeView空间</param> /// <param name="dt">数据源DataTable</param> /// <param name="text">text字段</param> /// <param name="value">value字段</param> /// <param name="parentid">深度字段 例如parentid</param> public static void CreateLevelTreeView(TreeView treeview, DataTable dt, string text, string value, string parentid) { DataView dv = dt.DefaultView; dv.RowFilter = parentid + " ='0'"; foreach (DataRowView drv in dv) { TreeNode node = new TreeNode(); node.Text = drv[text].ToString(); node.Value = drv[value].ToString(); node.Expanded = false; treeview.Nodes.Add(node); CreatTreeViewChildNode(dv, node, text, value, parentid); } } /// <summary> /// 递归绑定子节点 /// </summary> /// <param name="dv">源DataView</param> /// <param name="parentNode">当前节点</param> /// <param name="text">text字段</param> /// <param name="value">value字段</param> /// <param name="parentid">深度字段 例如parentid</param> private static void CreatTreeViewChildNode(DataView dv, TreeNode parentNode, string text, string value, string parentid) { dv.RowFilter = parentid + " ='" + parentNode.Value + "' "; foreach (DataRowView row in dv) { TreeNode replyNode = new TreeNode(); replyNode.Text = row[text].ToString(); replyNode.Value = row[value].ToString(); replyNode.Expanded = false; parentNode.ChildNodes.Add(replyNode); CreatTreeViewChildNode(dv, replyNode, text, value, parentid); } } #endregion #region 创建数据 private static DataTable createDT() { DataTable dt = new DataTable(); dt.Columns.Add("module_id"); dt.Columns.Add("module_name"); dt.Columns.Add("module_fatherid"); dt.Columns.Add("module_url"); dt.Columns.Add("module_order"); dt.Rows.Add("C1", "全国", "0", "", "1"); dt.Rows.Add("M01", "广东", "C1", "", "1"); dt.Rows.Add("M0101", "深圳", "M01", "", "100"); dt.Rows.Add("M010101", "南山区", "M0101", "", "1000"); dt.Rows.Add("M010102", "罗湖区", "M0101", "", "1001"); dt.Rows.Add("M010103", "福田区", "M0101", "", "1002"); dt.Rows.Add("M010104", "宝安区", "M0101", "", "1003"); dt.Rows.Add("M010105", "龙岗区", "M0101", "", "1004"); dt.Rows.Add("M01010301", "上梅林", "M010103", "", "1002001"); dt.Rows.Add("M01010302", "下梅林", "M010103", "", "1002002"); dt.Rows.Add("M01010303", "车公庙", "M010103", "", "1002003"); dt.Rows.Add("M01010304", "竹子林", "M010103", "", "1002004"); dt.Rows.Add("M01010305", "八卦岭", "M010103", "", "1002005"); dt.Rows.Add("M01010306", "华强北", "M010103", "", "1002006"); dt.Rows.Add("M0102", "广州", "M01", "", "101"); dt.Rows.Add("M010201", "越秀区", "M0102", "", "1105"); dt.Rows.Add("M010202", "海珠区", "M0102", "", "1106"); dt.Rows.Add("M010203", "天河区", "M0102", "", "1107"); dt.Rows.Add("M010204", "白云区", "M0102", "", "1108"); dt.Rows.Add("M010205", "黄埔区", "M0102", "", "1109"); dt.Rows.Add("M010206", "荔湾区", "M0102", "", "1110"); dt.Rows.Add("M010207", "罗岗区", "M0102", "", "1111"); dt.Rows.Add("M010208", "南沙区", "M0102", "", "1112"); return dt; } #endregion}
