ASP.NET DEMO 18: 如何编程动态创建 Menu
2009-02-22 15:55 晓风残月 阅读(2082) 评论(2) 编辑 收藏 举报ASP.NET DEMO 15: 如何编程动态创建 TreeView 的姊妹篇：
<%@ Page Language="C#" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.OleDb" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack) {
CreateMenu();
}
}
/// <summary>
/// 创建 Menu
/// 此方法采取一次性加载目标数据到 DataTable，递归查询 DataTable ，创建子节点
/// </summary>
private void CreateMenu()
{
//
const int VirtualRootId = 0; // 虚拟的根节点 ID， 表中 ParentID=0 的节点表示无实际父节点
const string SQL_SELECT = "SELECT NodeId, NodeName,ParentId FROM TreeView ORDER BY NodeId ASC";
//
string connStr = "Provider=Microsoft.Jet.OleDb.4.0;data source=" + Server.MapPath("Menu_CreateMenuDynamicFromDb.mdb"); ;
//
OleDbDataAdapter da = new OleDbDataAdapter(SQL_SELECT, connStr);
DataTable dt = new DataTable();
//
da.Fill(dt);
//
CreateMenuRecursive(mnuDemo.Items, dt, VirtualRootId);
}
/// <summary>
/// 递归查询数据，创建 MenuItem 节点
/// </summary>
/// <param name="items"></param>
/// <param name="dataSource"></param>
/// <param name="parentId"></param>
private void CreateMenuRecursive(MenuItemCollection items, DataTable dataSource, int parentId)
{
//
string fliter = String.Format("ParentId={0}", parentId);
// 查询子节点
DataRow[] drArr = dataSource.Select(fliter);
MenuItem item;
foreach(DataRow dr in drArr) {
//
item = new MenuItem();
items.Add(item);
item.Text = (string)dr["NodeName"];
// 设置其他属性
//
// 递归创建子节点
CreateMenuRecursive(item.ChildItems, dataSource, (int)dr["NodeId"]);
// 移除已添加行，提高性能
dataSource.Rows.Remove(dr);
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>CreateMenuResursiveFromDb</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h1>动态创建Menu</h1>
<asp:Menu ID="mnuDemo" runat="server" ExpandDepth="1" BackColor="#FFFBD6"
DynamicHorizontalOffset="2" Font-Names="Verdana" Font-Size="0.8em"
ForeColor="#990000" StaticSubMenuIndent="10px">
<StaticSelectedStyle BackColor="#FFCC66" />
<StaticMenuItemStyle HorizontalPadding="5px" VerticalPadding="2px" />
<DynamicHoverStyle BackColor="#990000" ForeColor="White" />
<DynamicMenuStyle BackColor="#FFFBD6" />
<DynamicSelectedStyle BackColor="#FFCC66" />
<DynamicMenuItemStyle HorizontalPadding="5px" VerticalPadding="2px" />
<StaticHoverStyle BackColor="#990000" ForeColor="White" />
</asp:Menu>
</div>
</form>
</body>
</html>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.OleDb" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack) {
CreateMenu();
}
}
/// <summary>
/// 创建 Menu
/// 此方法采取一次性加载目标数据到 DataTable，递归查询 DataTable ，创建子节点
/// </summary>
private void CreateMenu()
{
//
const int VirtualRootId = 0; // 虚拟的根节点 ID， 表中 ParentID=0 的节点表示无实际父节点
const string SQL_SELECT = "SELECT NodeId, NodeName,ParentId FROM TreeView ORDER BY NodeId ASC";
//
string connStr = "Provider=Microsoft.Jet.OleDb.4.0;data source=" + Server.MapPath("Menu_CreateMenuDynamicFromDb.mdb"); ;
//
OleDbDataAdapter da = new OleDbDataAdapter(SQL_SELECT, connStr);
DataTable dt = new DataTable();
//
da.Fill(dt);
//
CreateMenuRecursive(mnuDemo.Items, dt, VirtualRootId);
}
/// <summary>
/// 递归查询数据，创建 MenuItem 节点
/// </summary>
/// <param name="items"></param>
/// <param name="dataSource"></param>
/// <param name="parentId"></param>
private void CreateMenuRecursive(MenuItemCollection items, DataTable dataSource, int parentId)
{
//
string fliter = String.Format("ParentId={0}", parentId);
// 查询子节点
DataRow[] drArr = dataSource.Select(fliter);
MenuItem item;
foreach(DataRow dr in drArr) {
//
item = new MenuItem();
items.Add(item);
item.Text = (string)dr["NodeName"];
// 设置其他属性
//
// 递归创建子节点
CreateMenuRecursive(item.ChildItems, dataSource, (int)dr["NodeId"]);
// 移除已添加行，提高性能
dataSource.Rows.Remove(dr);
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>CreateMenuResursiveFromDb</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h1>动态创建Menu</h1>
<asp:Menu ID="mnuDemo" runat="server" ExpandDepth="1" BackColor="#FFFBD6"
DynamicHorizontalOffset="2" Font-Names="Verdana" Font-Size="0.8em"
ForeColor="#990000" StaticSubMenuIndent="10px">
<StaticSelectedStyle BackColor="#FFCC66" />
<StaticMenuItemStyle HorizontalPadding="5px" VerticalPadding="2px" />
<DynamicHoverStyle BackColor="#990000" ForeColor="White" />
<DynamicMenuStyle BackColor="#FFFBD6" />
<DynamicSelectedStyle BackColor="#FFCC66" />
<DynamicMenuItemStyle HorizontalPadding="5px" VerticalPadding="2px" />
<StaticHoverStyle BackColor="#990000" ForeColor="White" />
</asp:Menu>
</div>
</form>
</body>
</html>
