用TreeView實現(xiàn)樹菜單

liuqg 2006-03-18

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用TreeView實現(xiàn)樹菜單

加入日期：2005-12-19 文章來源：asp.net 點擊次數(shù)：196

　　具體方法是：創(chuàng)建一個數(shù)據(jù)庫，設(shè)計樹圖信息表S_Menu，包含NodeId、ParentId、NodeName、Address、Icon字段，其它字段根據(jù)實際業(yè)務(wù)而定，節(jié)點名稱NodeName將在樹型控件的節(jié)點上顯示，NodeId字段保存節(jié)點的唯一標識號，ParentId表示當前節(jié)點的父節(jié)點號，標識號組成了一個“鏈表”，記錄了樹上節(jié)點的結(jié)構(gòu)。設(shè)計一個Web窗體其上放置TreeView控件，修改其屬性Id為tvMenu。

數(shù)據(jù)結(jié)構(gòu)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

數(shù)據(jù)庫如下：
NodeId ParentId NodeName Address Icon
100000 0 公共查詢部   icon_document.gif
100001 100000 人民幣日報查詢 public/a1.aspx icon_settings.gif
100002 100000 外幣日報查詢 public/a2.aspx icon_settings.gif
100003 0 分行科技部   icon_document.gif
100004 100003 人民幣日報查詢 tech/a1.aspx icon_settings.gif
100005 100003 外幣日報查詢 tech/a2.aspx icon_settings.gif
100006 0 福田支行   icon_document.gif
100007 100006 月存款進度表 a1.aspx icon_settings.gif
100008 100006 月存款走勢圖 a2.aspx icon_settings.gif
100009 0 羅湖支行   icon_document.gif
100010 100009 月存款進度表 a1.aspx icon_settings.gif
100011 100009 月存款走勢圖 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=" </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代碼如下：
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 的摘要說明。
/// </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");
}
//建立數(shù)據(jù)集
private DataSet CreateDataSet()
{
   cmdSelect="select * from S_Menu";
   myCmd=new SqlDataAdapter(cmdSelect,Conn);
   ds=new DataSet();
   myCmd.Fill(ds,"tree");
   return ds;
}
//建樹的基本思路是：從根節(jié)點開始遞歸調(diào)用顯示子樹
         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
}
}