.NET平台下Web树形结构程序设计
数据库设计
| 列名 | 数据类型 | 描述 | 长度 | 主键 |
| ID | Int | 节点编号 | 4 | 是 |
| ParentID | Int | 父节点编号 | 4 | |
| ConText | Nvarchar | 我们要显示的节点内容 | 50 | |
CREATE TABLE [dbo].[tbTree] (
[ID] [int] IDENTITY (1, 1) NOT NULL ,
[Context] [nvarchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,
[ParentID] [int] NULL
) ON [PRIMARY]
SET IDENTITY_INSERT tbtree ON
insert tbtree (ID,Context,ParentID) values ( 1,'中国',0)
insert tbtree (ID,Context,ParentID) values ( 2,'北京',1)
insert tbtree (ID,Context,ParentID) values ( 3,'天津',1)
insert tbtree (ID,Context,ParentID) values ( 4,'河北省',1)
insert tbtree (ID,Context,ParentID) values ( 5,'广东省',1)
insert tbtree (ID,Context,ParentID) values ( 6,'广州',5)
insert tbtree (ID,Context,ParentID) values ( 7,'四川省',1)
insert tbtree (ID,Context,ParentID) values ( 8,'成都',7)
insert tbtree (ID,Context,ParentID) values ( 9,'深圳',5)
insert tbtree (ID,Context,ParentID) values ( 10,'石家庄',4)
insert tbtree (ID,Context,ParentID) values ( 11,'辽宁省',1)
insert tbtree (ID,Context,ParentID) values ( 12,'大连',11)
insert tbtree (ID,Context,ParentID) values ( 13,'上海',1)
insert tbtree (ID,Context,ParentID) values ( 14,'天河软件园',6)
insert tbtree (ID,Context,ParentID) values ( 15,'汕头',5)
SET IDENTITY_INSERT tbtree off
<%@ Register TagPrefix="iewc" Namespace="Microsoft.Web.UI.WebControls" Assembly="Microsoft.Web.UI.WebControls, Version=<?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />1.0.2.226, Culture=neutral, PublicKeyToken=31bf3856ad364e35" %><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />
<%@ Page Language="vb" AutoEventWireup="false" Codebehind="WebForm1.aspx.vb" Inherits="Tree.WebForm1"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<title>WebForm1</title>
<meta name="GENERATOR" content="Microsoft Visual Studio .NET 7.0">
<meta name="CODE_LANGUAGE" content="Visual Basic 7.0">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<FONT face="宋体">
<iewc:TreeView id="TreeView1" style="Z-INDEX: 101; LEFT: 39px; TOP: 68px" runat="server"></iewc:TreeView></FONT>
</form>
</body>
</HTML>
using System;using System.Collections;using System.ComponentModel;using System.Data;using System.Drawing;using System.Web;using System.Web.SessionState;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.HtmlControls;using Microsoft.Web.UI.WebControls;using System.Data.SqlClient;namespace TreeCS
{
/**//// <summary>
/// WebForm1 的摘要说明
/// </summary> public class WebForm1 : System.Web.UI.Page { protected Microsoft.Web.UI.WebControls.TreeView TreeView1; private void Page_Load(object sender, System.EventArgs e) { // 定义数据库连接 SqlConnection CN = new SqlConnection(); try { //初始化连接字符串 CN.ConnectionString= "data source=pmserver;initial catalog=Benchmark;persist security info=False;user id=sa;Password=sa;"; CN.Open(); SqlDataAdapter adp = new SqlDataAdapter("select * from tbTree",CN); DataSet ds=new DataSet(); adp.Fill(ds); this.ViewState["ds"]=ds; } catch (Exception ex) { Session["Error"] = ex.ToString(); Response.Redirect("error.aspx"); //̀跳转程序的公共错误处理页面 } finally { CN.Close(); } //调用递归函数，完成树形结构的生成 AddTree(0, (TreeNode)null); } //递归添加树的节点 public void AddTree(int ParentID,TreeNode pNode) { DataSet ds=(DataSet) this.ViewState["ds"]; DataView dvTree = new DataView(ds.Tables[0]); //过滤ParentID,得到当前的所有子节点 dvTree.RowFilter = "[PARENTID] = " + ParentID; foreach(DataRowView Row in dvTree) { TreeNode Node=new TreeNode() ; if(pNode == null) { //添加根节点 Node.Text = Row["ConText"].ToString(); TreeView1.Nodes.Add(Node); Node.Expanded=true; AddTree(Int32.Parse(Row["ID"].ToString()), Node); //再次递归 } else { //̀添加当前节点的子节点 Node.Text = Row["ConText"].ToString(); pNode.Nodes.Add(Node); Node.Expanded = true; AddTree(Int32.Parse(Row["ID"].ToString()),Node); //再次递归 } } } Web Form Designer generated code#region Web Form Designer generated code override protected void OnInit(EventArgs e) { // // CODEGEN该调用是 ASP.NET Web 窗体设计器所必需的。 // InitializeComponent(); base.OnInit(e); } /**//// <summary> ///设计器支持所需的方法 - 不要使用代码编辑器修改 /// 此方法的内容 /// </summary> private void InitializeComponent() { this.Load += new System.EventHandler(this.Page_Load); } #endregion }
}
