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MenuItem.Parent Proprietà

  • Riferimento

Definizione

Spazio dei nomi:
System.Web.UI.WebControls
Assembly:
System.Web.dll

Ottiene la voce di menu padre della voce di menu corrente.

public:
 property System::Web::UI::WebControls::MenuItem ^ Parent { System::Web::UI::WebControls::MenuItem ^ get(); };
[System.ComponentModel.Browsable(false)]
public System.Web.UI.WebControls.MenuItem Parent { get; }
[<System.ComponentModel.Browsable(false)>]
member this.Parent : System.Web.UI.WebControls.MenuItem
Public ReadOnly Property Parent As MenuItem

Valore della proprietà

MenuItem

Oggetto MenuItem che rappresenta la voce di menu padre della voce di menu corrente.

Attributi
BrowsableAttribute

Esempio

Nell'esempio seguente viene illustrato come usare la Parent proprietà per accedere alla voce di menu padre di una voce di menu figlio.


<%@ 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 MenuItemClick_NavigationMenu(Object sender, MenuEventArgs e)
  {
    // Use the Parent property to access the 
    // parent menu item of the menu item clicked
    // by the user.
    MenuItem parentItem = e.Item.Parent;

    // Display the parent menu item.
    if (parentItem != null)
    {
      Message.Text = "You are in the " + parentItem.Text + 
        " category.";
    }
    else
    {
      Message.Text = "The selected menu item is a root menu item.";
    }
  }
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>MenuItem Parent Example</title>
</head>
<body>
    <form id="form1" runat="server">
    
      <h3>MenuItem Parent Example</h3>
    
      <asp:menu id="NavigationMenu"
        staticdisplaylevels="2"
        staticsubmenuindent="10" 
        orientation="Vertical"
        onmenuitemclick="MenuItemClick_NavigationMenu"
        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>
      
      <hr/>

      <asp:label id="Message" 
        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 MenuItemClick_NavigationMenu(ByVal sender As Object, ByVal e As MenuEventArgs)
  
    ' Use the Parent property to access the 
    ' parent menu item of the menu item clicked
    ' by the user.
    Dim parentItem As MenuItem = e.Item.Parent

    ' Display the parent menu item.
    If parentItem IsNot Nothing Then

      Message.Text = "You are in the " & parentItem.Text & _
        " category."
    
    Else
    
      Message.Text = "The selected menu item is a root menu item."
      
    End If
    
  End Sub
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>MenuItem Parent Example</title>
</head>
<body>
    <form id="form1" runat="server">
    
      <h3>MenuItem Parent Example</h3>
    
      <asp:menu id="NavigationMenu"
        staticdisplaylevels="2"
        staticsubmenuindent="10" 
        orientation="Vertical"
        onmenuitemclick="MenuItemClick_NavigationMenu"
        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>
      
      <hr/>

      <asp:label id="Message" 
        runat="server"/>

    </form>
  </body>
</html>

Commenti

Utilizzare la proprietà per determinare la Parent voce di menu padre o per accedere alle relative proprietà.

Nota

Una voce di menu radice non ha una voce di menu padre.

Per accedere alle voci di sottomenu della voce di menu corrente, usare la ChildItems proprietà .

Si applica a

Vedi anche