MenuItemBindingCollection.IndexOf(MenuItemBinding) 方法
定义
重要
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确定集合中指定 MenuItemBinding 对象的索引。
public:
int IndexOf(System::Web::UI::WebControls::MenuItemBinding ^ value);public int IndexOf (System.Web.UI.WebControls.MenuItemBinding value);member this.IndexOf : System.Web.UI.WebControls.MenuItemBinding -> intPublic Function IndexOf (value As MenuItemBinding) As Integer参数
- value
- MenuItemBinding
要确定其索引的 MenuItemBinding。
返回
如果在集合中找到 value，则为第一个匹配项从零开始的索引；否则为 -1。
示例
下面的代码示例演示如何使用 IndexOf 方法确定 集合中对象的索引 MenuItemBinding 。 若要使此示例正常工作，必须将以下示例 XML 数据复制到名为 Map.xml 的文件。
<%@ 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)
{
// Use the indexer to retrieve the MenuItemBinding
// object at index 2.
MenuItemBinding binding = NavigationMenu.DataBindings[2];
int index = NavigationMenu.DataBindings.IndexOf(binding);
Message.Text = "The MenuItemBinding object that is applied " +
"to the menu items at depth 2 is contained in the Bindings " +
"collection at index " + index.ToString() + ".";
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>MenuItemBindingCollection IndexOf Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>MenuItemBindingCollection IndexOf Example</h3>
<asp:menu id="NavigationMenu"
staticdisplaylevels="2"
staticsubmenuindent="10"
orientation="Vertical"
target="_blank"
datasourceid="MenuSource"
runat="server">
<DataBindings>
<asp:menuitembinding datamember="MapHomeNode"
depth="0"
textfield="title"
navigateurlfield="url"/>
<asp:menuitembinding datamember="MapNode"
depth="1"
textfield="title"
navigateurlfield="url"/>
<asp:menuitembinding datamember="MapNode"
depth="2"
textfield="title"
navigateurlfield="url"/>
</DataBindings>
</asp:menu>
<hr/>
<asp:label id="Message"
runat="server"/>
<asp:xmldatasource id="MenuSource"
datafile="Map.xml"
runat="server"/>
</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
' Use the indexer to retrieve the MenuItemBinding
' object at index 2.
Dim binding As MenuItemBinding = NavigationMenu.DataBindings(2)
Dim index As Integer = NavigationMenu.DataBindings.IndexOf(binding)
Message.Text = "The MenuItemBinding object that is applied " & _
"to the menu items at depth 2 is contained in the Bindings " & _
"collection at index " & index.ToString() & "."
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>MenuItemBindingCollection IndexOf Example</title>
</head>
<body>
<form id="Form1" runat="server">
<h3>MenuItemBindingCollection IndexOf Example</h3>
<asp:menu id="NavigationMenu"
staticdisplaylevels="2"
staticsubmenuindent="10"
orientation="Vertical"
target="_blank"
datasourceid="MenuSource"
runat="server">
<DataBindings>
<asp:menuitembinding datamember="MapHomeNode"
depth="0"
textfield="title"
navigateurlfield="url"/>
<asp:menuitembinding datamember="MapNode"
depth="1"
textfield="title"
navigateurlfield="url"/>
<asp:menuitembinding datamember="MapNode"
depth="2"
textfield="title"
navigateurlfield="url"/>
</DataBindings>
</asp:menu>
<hr/>
<asp:label id="Message"
runat="server"/>
<asp:xmldatasource id="MenuSource"
datafile="Map.xml"
runat="server"/>
</form>
</body>
</html>
下面是上一示例的示例站点地图数据。
<MapHomeNode url="~\Home.aspx"
title="Home"
description="Home">
<MapNode url="~\Music.aspx"
title="Music"
description="Music">
<MapNode url="~\Classical.aspx"
title="Classical"
description="Classical"/>
<MapNode url="~\Rock.aspx"
title="Rock"
description="Rock"/>
<MapNode url="~\Jazz.aspx"
title="Jazz"
description="Jazz"/>
</MapNode>
<MapNode url="~\Movies.aspx"
title="Movies"
description="Movies">
<MapNode url="~\Action.aspx"
title="Action"
description="Action"/>
<MapNode url="~\Drama.aspx"
title="Drama"
description="Drama"/>
<MapNode url="~\Musical.aspx"
title="Musical"
description="Musical"/>
</MapNode>
</MapHomeNode>
注解
IndexOf使用 方法确定集合中指定MenuItemBinding对象的索引。
注意
对象在集合中的显示顺序 MenuItemBinding 不会影响这些对象如何应用于控件中的 Menu 菜单项。
如果菜单项绑定不在集合中，该方法将返回 -1。
注意
如果指定的菜单项绑定在集合中出现多次，则返回第一个匹配项的索引。
