用TreeView实现树菜单

2003-04-02· ·pery··天极论坛

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 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

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
    }
}
Contributors: FHL