menu与数据库的绑定
所用数据库如下两图：
http://www.cnblogs.com/randomize/gallery/463325.html
前台的代码：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="MenuDatabase.aspx.cs" Inherits="MenuDatabase" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>menu与数据库的绑定</title>
<style type="text/css">
.menuItem
{
border:Solid 1px black;
width:100px;
padding:2px;
background-color:#eeeeee;
}
.menuItem a
{
color:blue;
}
.grid
{
margin-top:10px;
}
.grid td, .grid th
{
padding:10px;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Menu
id="Menu1"
Orientation="horizontal"
StaticMenuItemStyle-CssClass="menuItem"
DynamicMenuItemStyle-CssClass="menuItem"
Runat="server" />
<asp:GridView
id="grdProducts"
DataSourceID="srcProducts"
CssClass="grid"
AutoGenerateColumns="false"
Runat="server">
<Columns>
<asp:BoundField
DataField="ProductName"
HeaderText="Product" />
<asp:BoundField
DataField="Price"
HeaderText="Price"
DataFormatString="{0:c}" />
</Columns>
</asp:GridView>
<asp:SqlDataSource
id="srcProducts"
ConnectionString="<%$ ConnectionStrings:Categories %>"
SelectCommand="SELECT ProductName,Price FROM Products
WHERE "
Runat="server">
<SelectParameters>
<asp:ControlParameter
Name="CategoryId"
ControlID="Menu1" />
</SelectParameters>
</asp:SqlDataSource>
</div>
</form>
</body>
</html>
后台代码：
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
public partial class MenuDatabase : System.Web.UI.Page
{
/// <summary>
/// Only populate the menu when the page first loads
/// </summary>
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
PopulateMenu();
}
/// <summary>
/// Get the data from the database and create the top-level
/// menu items
/// </summary>
private void PopulateMenu()
{
DataTable menuData = GetMenuData();
AddTopMenuItems(menuData);
}
/// <summary>
/// Use a DataAdapter and DataTable to grab the database data
/// </summary>
/// <returns></returns>
private DataTable GetMenuData()
{
// Get Categories table
string selectCommand = "SELECT CategoryId,ParentId,Name FROM Categories";
string conString = ConfigurationManager.ConnectionStrings["Categories"].ConnectionString;
SqlDataAdapter dad = new SqlDataAdapter(selectCommand, conString);
DataTable dtblCategories = new DataTable();
dad.Fill(dtblCategories);
return dtblCategories;
}
/// <summary>
/// Filter the data to get only the rows that have a
/// null ParentID (these are the top-level menu items)
/// </summary>
private void AddTopMenuItems(DataTable menuData)
{
DataView view = new DataView(menuData);
view.RowFilter = "ParentID IS NULL";
foreach (DataRowView row in view)
{
MenuItem newMenuItem = new MenuItem(row["Name"].ToString(), row["CategoryId"].ToString());
Menu1.Items.Add(newMenuItem);
AddChildMenuItems(menuData, newMenuItem);
}
}
/// <summary>
/// Recursively add child menu items by filtering by ParentID
/// </summary>
private void AddChildMenuItems(DataTable menuData, MenuItem parentMenuItem)
{
DataView view = new DataView(menuData);
view.RowFilter = "ParentID=" + parentMenuItem.Value;
foreach (DataRowView row in view)
{
MenuItem newMenuItem = new MenuItem(row["Name"].ToString(), row["CategoryId"].ToString());
parentMenuItem.ChildItems.Add(newMenuItem);
AddChildMenuItems(menuData, newMenuItem);
}
}
}
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