用TreeView实现树菜单

 

用TreeView实现树菜单

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具体方法是：创建一个数据库，设计树图信息表S_Menu，包含NodeId、ParentId、NodeName、Address、Icon字段，其它字段根据实际业务而定，节点名称NodeName将在树型控件的节点上显示，NodeId字段保存节点的唯一标识号，ParentId表示当前节点的父节点号，标识号组成了一个“链表”，记录了树上节点的结构。设计一个Web窗体其上放置TreeView控件，修改其属性Id为tvMenu。 

数据结构如下：

Code

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CODE:

CREATE TABLE [dbo].[S_Menu] (
[NodeId] [char] (6) COLLATE Chinese_PRC_CI_AS NULL ,
[ParentId] [char] (6) COLLATE Chinese_PRC_CI_AS NULL ,
[NodeName] [nvarchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,
[Address] [nvarchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,
[Icon] [nvarchar] (50) COLLATE Chinese_PRC_CI_AS NULL
) ON [PRIMARY]
GO

数据库如下：

Code

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CODE:

NodeId ParentId NodeName Address  Icon
100000 0  公共查询部  icon_document.gif
100001 100000  人民币日报查询 public/a1.aspx icon_settings.gif
100002 100000  外币日报查询 public/a2.aspx icon_settings.gif
100003 0  分行科技部  icon_document.gif
100004 100003  人民币日报查询 tech/a1.aspx icon_settings.gif
100005 100003  外币日报查询 tech/a2.aspx icon_settings.gif
100006 0  福田支行  icon_document.gif
100007 100006  月存款进度表 a1.aspx  icon_settings.gif
100008 100006  月存款走势图 a2.aspx  icon_settings.gif
100009 0  罗湖支行  icon_document.gif
100010 100009  月存款进度表 a1.aspx  icon_settings.gif
100011 100009  月存款走势图 a2.aspx  icon_settings.gif

menu_left.aspx文件如下：

Code

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CODE:

<%@ Register TagPrefix="iewc" Namespace="Microsoft.Web.UI.WebControls" Assembly="Microsoft.Web.UI.WebControls, Version=1.0.2.226, Culture=neutral, PublicKeyToken=31bf3856ad364e35" %>
<%@ Page language="c#" Codebehind="menu_Left.aspx.cs" AutoEventWireup="false" Inherits="hzquery.menu.menu_Left" %>
<HTML>
<HEAD>
  <title>menu_Left</title>
  <meta name="GENERATOR" Content="Microsoft Visual Studio 7.0">
  <meta name="CODE_LANGUAGE" Content="C#">
  <meta name="vs_defaultClientScript" content="JavaScript">
  <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body MS_POSITIONING="GridLayout">
  <form id="menu_Left" method="post" runat="server">
  <iewc:TreeView id="tvMenu" runat="server"></iewc:TreeView>
  </form>
</body>
</HTML>

codebehind代码如下：

Code

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CODE:

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 hzquery.menu
{
/// <summary>
/// menu_Left 的摘要说明。
/// </summary>
public class menu_Left : System.Web.UI.Page
{
  protected Microsoft.Web.UI.WebControls.TreeView tvMenu;
  SqlConnection Conn;
  SqlDataAdapter myCmd;
  DataSet ds;
  string cmdSelect; 

  private void Page_Load(object sender, System.EventArgs e)
  {
  Conn=new SqlConnection(Application["ConnString"].ToString());
  CreateDataSet();
  InitTree(tvMenu.Nodes,"0");
  }
  //建立数据集
  private DataSet CreateDataSet()
  {
  cmdSelect="select * from S_Menu";
  myCmd=new SqlDataAdapter(cmdSelect,Conn);
  ds=new DataSet();
  myCmd.Fill(ds,"tree");
  return ds;
  }
  //建树的基本思路是：从根节点开始递归调用显示子树
        private void InitTree(TreeNodeCollection Nds,string parentId)
  {
  DataView dv=new DataView();
  TreeNode tmpNd;
  string intId;
  dv.Table=ds.Tables["tree"];
  dv.RowFilter="ParentId=""  parentId  """ ;
  foreach(DataRowView drv in dv)
  {
    tmpNd=new TreeNode();
    tmpNd.ID=drv["NodeId"].ToString();
    tmpNd.Text=drv["NodeName"].ToString();
    tmpNd.ImageUrl="../webimages/" drv["Icon"].ToString();
    tmpNd.NavigateUrl="../" drv["Address"].ToString();
    Nds.Add(tmpNd);
    intId=drv["ParentId"].ToString();
    InitTree(tmpNd.Nodes,tmpNd.ID);
  }
  } 

  #region Web Form Designer generated code
  override protected void OnInit(EventArgs e)
  {
  InitializeComponent();
  base.OnInit(e);
  }
  private void InitializeComponent()
  {   
  this.Load  = new System.EventHandler(this.Page_Load); 

  }
  #endregion
}
}

作者：追风  来自:网络