MenuItemBindingCollection.IndexOf(MenuItemBinding) Metodo

Definizione

Determina l'indice dell'oggetto MenuItemBinding specificato nell'insieme.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

Parametri

value
MenuItemBinding

Oggetto MenuItemBinding di cui determinare l'indice.The MenuItemBinding to determine the index of.

Restituisce

Indice in base zero della prima occorrenza di value all'interno dell'insieme, se presente; in caso contrario, -1.The zero-based index of the first occurrence of value within the collection, if found; otherwise, -1.

Esempio

Nell'esempio di codice riportato di seguito viene illustrato IndexOf come utilizzare il metodo per determinare l' MenuItemBinding indice di un oggetto nella raccolta.The following code example demonstrates how to use the IndexOf method to determine the index of a MenuItemBinding object in the collection. Per il corretto funzionamento di questo esempio, è necessario copiare i dati XML di esempio seguenti in un file denominato map. XML.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>

Di seguito sono riportati i dati di esempio della mappa del sito per l'esempio precedente.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>

Commenti

Utilizzare il IndexOf metodo per determinare l'indice dell'oggetto specificato MenuItemBinding nella raccolta.Use the IndexOf method to determine the index of the specified MenuItemBinding object in the collection.

Nota

L'ordine in cui MenuItemBinding gli oggetti vengono visualizzati nella raccolta non influisce sulla modalità di applicazione degli oggetti alle voci di menu in Menu un controllo.The 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.

Se l'associazione alla voce di menu non è presente nella raccolta, il metodo restituisce-1.If the menu item binding is not in the collection, the method returns -1.

Nota

Se l'associazione alla voce di menu specificata viene visualizzata più volte nell'insieme, viene restituito l'indice della prima occorrenza.If the specified menu item binding appears multiple times in the collection, the index of the first occurrence is returned.

Si applica a

Vedi anche