MenuItemBindingCollection.IndexOf(MenuItemBinding) 方法

定义

确定集合中指定 MenuItemBinding 对象的索引。Determines the index of the specified MenuItemBinding object in the collection.

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 -> int
Public Function IndexOf (value As MenuItemBinding) As Integer

参数

value
MenuItemBinding

要确定其索引的 MenuItemBindingThe MenuItemBinding to determine the index of.

返回

Int32

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。The zero-based index of the first occurrence of value within the collection, if found; otherwise, -1.

示例

下面的代码示例演示如何使用 IndexOf 方法来确定 MenuItemBinding 集合中对象的索引。The following code example demonstrates how to use the IndexOf method to determine the index of a MenuItemBinding object in the collection. 要使此示例正常工作,必须将下面的示例 XML 数据复制到名为 Map.xml 的文件中。For this example to work correctly, you must copy the sample XML data below to a file named Map.xml.


<%@ 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>

下面是前面示例的示例站点地图数据。The following is sample site map data for the previous example.

<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

使用 IndexOf 方法可确定集合中指定对象的索引 MenuItemBindingUse the IndexOf method to determine the index of the specified MenuItemBinding object in the collection.

备注

MenuItemBinding对象在集合中的显示顺序对这些对象如何应用于控件中的菜单项没有任何影响 MenuThe order in which MenuItemBinding objects appear in the collection has no effect on how those objects are applied to the menu items in a Menu control.

如果菜单项绑定不在集合中,则该方法将返回-1。If the menu item binding is not in the collection, the method returns -1.

备注

如果指定的菜单项绑定在集合中多次出现,则返回第一个匹配项的索引。If the specified menu item binding appears multiple times in the collection, the index of the first occurrence is returned.

适用于

另请参阅