MenuItemCollection.AddAt(Int32, MenuItem) 方法
定义
重要
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将指定的 MenuItem 对象插入到当前 MenuItemCollection 对象的指定索引位置。
public:
void AddAt(int index, System::Web::UI::WebControls::MenuItem ^ child);
public void AddAt (int index, System.Web.UI.WebControls.MenuItem child);
member this.AddAt : int * System.Web.UI.WebControls.MenuItem -> unit
Public Sub AddAt (index As Integer, child As MenuItem)
参数
示例
下面的代码示例演示如何使用 AddAt 方法以编程方式将 MenuItemCollection 对象插入MenuItem到指定索引位置的 对象中。
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
void Page_Load(Object sender, EventArgs e)
{
if (!IsPostBack)
{
// Retrieve the root menu item from the Items
// collection of the Menu control.
MenuItem homeMenuItem = NavigationMenu.Items[0];
// Create the submenu item.
MenuItem newSubMenuItem = new MenuItem("New Category");
// Insert the submenu item in the ChildItems
// collection of the root menu item at index 0.
homeMenuItem.ChildItems.AddAt(0, newSubMenuItem);
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>MenuItemCollection AddAt Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>MenuItemCollection AddAt Example</h3>
<asp:menu id="NavigationMenu"
orientation="Vertical"
target="_blank"
runat="server">
<items>
<asp:menuitem text="Home"
tooltip="Home">
<asp:menuitem text="Music"
tooltip="Music">
<asp:menuitem text="Classical"
tooltip="Classical"/>
<asp:menuitem text="Rock"
tooltip="Rock"/>
<asp:menuitem text="Jazz"
tooltip="Jazz"/>
</asp:menuitem>
<asp:menuitem text="Movies"
tooltip="Movies">
<asp:menuitem text="Action"
tooltip="Action"/>
<asp:menuitem text="Drama"
tooltip="Drama"/>
<asp:menuitem text="Musical"
tooltip="Musical"/>
</asp:menuitem>
</asp:menuitem>
</items>
</asp:menu>
</form>
</body>
</html>
<%@ Page Language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
If Not IsPostBack Then
' Retrieve the root menu item from the Items
' collection of the Menu control.
Dim homeMenuItem As MenuItem = NavigationMenu.Items(0)
' Create the submenu item.
Dim newSubMenuItem = New MenuItem("New Category")
' Insert the submenu item in the ChildItems
' collection of the root menu item at index 0.
homeMenuItem.ChildItems.AddAt(0, newSubMenuItem)
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>MenuItemCollection AddAt Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>MenuItemCollection AddAt Example</h3>
<asp:menu id="NavigationMenu"
orientation="Vertical"
target="_blank"
runat="server">
<items>
<asp:menuitem text="Home"
tooltip="Home">
<asp:menuitem text="Music"
tooltip="Music">
<asp:menuitem text="Classical"
tooltip="Classical"/>
<asp:menuitem text="Rock"
tooltip="Rock"/>
<asp:menuitem text="Jazz"
tooltip="Jazz"/>
</asp:menuitem>
<asp:menuitem text="Movies"
tooltip="Movies">
<asp:menuitem text="Action"
tooltip="Action"/>
<asp:menuitem text="Drama"
tooltip="Drama"/>
<asp:menuitem text="Musical"
tooltip="Musical"/>
</asp:menuitem>
</asp:menuitem>
</items>
</asp:menu>
</form>
</body>
</html>
注解
AddAt使用 方法将指定MenuItem对象插入集合中的指定索引处。
注意
可以将 null 值和重复 MenuItem 对象添加到集合中。
作为替代方法,只需使用 Add 方法将 对象追加MenuItem到集合的末尾。