Asp.net 1.1 Treeview 控件的一个简单的数据绑定,Asp.net1.1自身没有Treeview控件,可以从网上download安装即可,树形控件绑定的一个重要的思想就是递归的思想,所以在绑定的时候就要使用递归的方法,考录到性能问题,通常是将数据一次性load到一个容器中如:缓存,然后根据条件在缓存中将数据绑定到树形控件上,下面是个简单的例子
后台代码:
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using System;
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using System.Collections;
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using System.ComponentModel;
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using System.Data;
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using System.Drawing;
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using System.Web;
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using System.Web.SessionState;
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using System.Web.UI;
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using System.Web.UI.WebControls;
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using System.Web.UI.HtmlControls;
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using System.Data.SqlClient;
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using Microsoft.Web.UI.WebControls;
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namespace TreeTest
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{
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/// <summary>
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/// WebForm1 的摘要说明。
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/// </summary>
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public class WebForm1 : System.Web.UI.Page
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{
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protected Microsoft.Web.UI.WebControls.TreeView Tree2;
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private void Page_Load(object sender, System.EventArgs e)
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{
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if(!IsPostBack)
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{
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InitTree();
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}
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}
29![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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Web 窗体设计器生成的代码
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private void InitTree()
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{
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try
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{
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TreeNode node=new TreeNode();
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node.Text="根节点";
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node.ID="-1";
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string sqlString="Select * From Tree Where ParentID=0";
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Tree2.Nodes.Add(node);
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SqlDataReader rd=GetDataReader(sqlString);
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while(rd.Read())
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{
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string pId=rd["ID"].ToString();
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TreeNode node1=new TreeNode();
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node1.Text=rd.GetString(1);
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node1.ID=rd["ID"].ToString();
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node.Nodes.Add(node1);
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MakeTree(node1,pId);
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}
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}
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catch(Exception err){Console.WriteLine(err.Message);}
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finally{}
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}
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private void MakeTree(TreeNode fnode,string pId)
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{
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try
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{
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TreeNode node;
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string sqlString="Select ID,Name,ParentID From Tree Where ParentID="+pId;
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SqlDataReader rd=GetDataReader(sqlString);
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while(rd.Read())
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{
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string PID=rd["ID"].ToString();
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node=new TreeNode();
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node.Text=rd["Name"].ToString();
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node.ID=rd["ID"].ToString();
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fnode.Nodes.Add(node);
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MakeTree(node,PID); //递归
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}
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rd.Close();
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}
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catch(Exception err)
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{
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Console.WriteLine(err.Message);
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}
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finally{}
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}
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private SqlDataReader GetDataReader(string sqlString)
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{
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try
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{
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string conString=System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];
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SqlConnection conn=new SqlConnection(conString);
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SqlCommand cmd=new SqlCommand(sqlString);
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conn.Open();
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cmd.Connection=conn;
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return cmd.ExecuteReader();
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}
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catch (System.Exception e)
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{
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return null;
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}
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finally
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{ }
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}
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}
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}
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<%@ Register TagPrefix="iewc1" Namespace="Microsoft.Web.UI.WebControls" Assembly="Microsoft.Web.UI.WebControls" %>
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<%@ Page language="c#" Codebehind="WebForm1.aspx.cs" AutoEventWireup="false" Inherits="TreeTest.WebForm1" %>
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
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<HTML>
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<HEAD>
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<title>WebForm1</title>
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<meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
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<meta name="CODE_LANGUAGE" Content="C#">
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<meta name="vs_defaultClientScript" content="JavaScript">
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<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
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</HEAD>
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<body MS_POSITIONING="GridLayout">
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<form id="Form1" method="post" runat="server">
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<FONT face="宋体">
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<iewc1:TreeView id="Tree2" style="Z-INDEX: 101; LEFT: 104px; POSITION: absolute; TOP: 160px" runat="server"></iewc1:TreeView></FONT>
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</form>
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</body>
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</HTML>
数据结构:![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
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if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[Tree]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
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drop table [dbo].[Tree]
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GO
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CREATE TABLE [dbo].[Tree] (
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[ID] [int] IDENTITY (1, 1) NOT NULL ,
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[Name] [varchar] (50) COLLATE Chinese_PRC_CI_AS NOT NULL ,
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[ParentID] [int] NOT NULL
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) ON [PRIMARY]
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GO
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