位置：海鸟网 > IT > ASP.NET >

用TreeView实现树菜单

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：
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：
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：
<％@ 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 Content="Microsoft Visual Studio 7.0">
  <meta Content="C#">
  <meta content="Javascript">
  <meta content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body MS_POSITIONING="GridLayout">
  <form method="post" runat="server">
   <iewc:TreeView runat="server"></iewc:TreeView>
  </form>
</body>
</HTML>



CodeBehind代码如下：
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="../images/"+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
}
}