.NET Framework Class Library MenuEventHandler Delegate
Namespace:
System.Web.UI.WebControls
Assembly:
System.Web (in System.Web.dll)
Syntax
Public Delegate Sub MenuEventHandler ( _
sender As Object, _
e As MenuEventArgs _
)
public delegate void MenuEventHandler(
Object sender,
MenuEventArgs e
)
public delegate void MenuEventHandler(
Object^ sender,
MenuEventArgs^ e
)
type MenuEventHandler =
delegate of
sender:Object *
e:MenuEventArgs -> unit
Remarks
The MenuEventHandler class is used to represent the method that handles the events in the following table. Event | Description |
|---|
MenuItemClick
| Occurs when a menu item is clicked. This event is commonly used to synchronize a Menu control with another control on the page. |
MenuItemDataBound
| Occurs when a menu item is bound to data. This event is commonly used to modify a menu item before it is rendered in a Menu control. |
When you create a MenuEventHandler delegate, you identify the method that will handle the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate. For more information about event-handler delegates, see Events and Delegates.
Examples
The following code example demonstrates how to use the MenuEventHandler delegate to programmatically register an event handler for the MenuItemClick event of a Menu control. For this example to work correctly, you must copy the sample site map data below to a file named Web.sitemap.
<%@ 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)
' Create a new Menu control.
Dim newMenu As New Menu()
' Set the properties of the Menu control.
newMenu.ID = "NavigationMenu"
newMenu.Orientation = Orientation.Vertical
newMenu.Target = "_blank"
' Specify the data source for the menu.
newMenu.DataSourceID = "MenuSource"
' Programmatically register the event-handling method
' for the MenuItemClick event of a Menu control.
AddHandler newMenu.MenuItemClick, AddressOf NavigationMenu_MenuItemClick
' Add the Menu control to the Controls collection
' of the PlaceHolder control.
MenuPlaceHolder.Controls.Add(newMenu)
End Sub
Sub NavigationMenu_MenuItemClick(ByVal sender As Object, ByVal e As MenuEventArgs)
' Display the text of the menu item selected by the user.
Message.Text = "You selected " & e.Item.Text & "."
End Sub
</script>
<html >
<head runat="server">
<title>MenuEventHandler Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>MenuEventHandler Example</h3>
<asp:placeholder id="MenuPlaceHolder"
runat="server"/>
<asp:sitemapdatasource id="MenuSource"
runat="server"/>
<hr/>
<asp:label id="Message"
runat="server"/>
</form>
</body>
</html>
<%@ 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)
{
// Create a new Menu control.
Menu newMenu = new Menu();
// Set the properties of the Menu control.
newMenu.ID = "NavigationMenu";
newMenu.Orientation = Orientation.Vertical;
newMenu.Target = "_blank";
// Specify the data source for the menu.
newMenu.DataSourceID = "MenuSource";
// Programmatically register the event-handling method
// for the MenuItemClick event of a Menu control.
newMenu.MenuItemClick += new MenuEventHandler(this.NavigationMenu_MenuItemClick);
// Add the Menu control to the Controls collection
// of the PlaceHolder control.
MenuPlaceHolder.Controls.Add(newMenu);
}
void NavigationMenu_MenuItemClick(Object sender, MenuEventArgs e)
{
// Display the text of the menu item selected by the user.
Message.Text = "You selected " + e.Item.Text + ".";
}
</script>
<html >
<head runat="server">
<title>MenuEventHandler Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>MenuEventHandler Example</h3>
<asp:placeholder id="MenuPlaceHolder"
runat="server"/>
<asp:sitemapdatasource id="MenuSource"
runat="server"/>
<hr/>
<asp:label id="Message"
runat="server"/>
</form>
</body>
</html>
The following is sample site map data for the previous example.
<siteMap>
<siteMapNode title="Home"
description="Home">
<siteMapNode title="Music"
description="Music">
<siteMapNode title="Classical"
description="Classical"/>
<siteMapNode title="Rock"
description="Rock"/>
<siteMapNode title="Jazz"
description="Jazz"/>
</siteMapNode>
<siteMapNode title="Movies"
description="Movies">
<siteMapNode title="Action"
description="Action"/>
<siteMapNode title="Drama"
description="Drama"/>
<siteMapNode title="Musical"
description="Musical"/>
</siteMapNode>
</siteMapNode>
</siteMap>
Version Information
.NET FrameworkSupported in: 4, 3.5, 3.0, 2.0
Platforms
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role not supported), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
See Also
|
Bibliothèque de classes .NET Framework MenuEventHandler, délégué
Espace de noms :
System.Web.UI.WebControls
Assembly :
System.Web (dans System.Web.dll)
Syntaxe
Public Delegate Sub MenuEventHandler ( _
sender As Object, _
e As MenuEventArgs _
)
public delegate void MenuEventHandler(
Object sender,
MenuEventArgs e
)
public delegate void MenuEventHandler(
Object^ sender,
MenuEventArgs^ e
)
type MenuEventHandler =
delegate of
sender:Object *
e:MenuEventArgs -> unit
Notes
La classe MenuEventHandler permet de représenter la méthode qui gère les événements du tableau suivant. Événement | Description |
|---|
MenuItemClick
| Se produit lorsqu'un utilisateur clique sur un élément de menu. Cet événement est utilisé couramment pour synchroniser un contrôle Menu avec un autre contrôle de la page. |
MenuItemDataBound
| Se produit lorsqu'un élément de menu est lié à des données. Cet événement est utilisé couramment pour modifier un élément de menu avant qu'il soit rendu dans un contrôle Menu. |
Lorsque vous créez un délégué MenuEventHandler, vous identifiez la méthode qui gérera l'événement. Pour associer l'événement à votre gestionnaire d'événements, ajoutez une instance du délégué à l'événement. Le gestionnaire d'événements est appelé chaque fois qu'un événement se produit, sauf si vous supprimez le délégué. Pour plus d'informations sur les délégués de gestionnaires d'événements, consultez Événements et délégués.
Exemples
L'exemple de code suivant montre comment utiliser le délégué MenuEventHandler pour enregistrer par programme un gestionnaire d'événements pour l'événement MenuItemClick d'un contrôle Menu. Pour que cet exemple fonctionne, vous devez copier les données du plan de site ci-dessous dans un fichier nommé Web.sitemap.
<%@ 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)
' Create a new Menu control.
Dim newMenu As New Menu()
' Set the properties of the Menu control.
newMenu.ID = "NavigationMenu"
newMenu.Orientation = Orientation.Vertical
newMenu.Target = "_blank"
' Specify the data source for the menu.
newMenu.DataSourceID = "MenuSource"
' Programmatically register the event-handling method
' for the MenuItemClick event of a Menu control.
AddHandler newMenu.MenuItemClick, AddressOf NavigationMenu_MenuItemClick
' Add the Menu control to the Controls collection
' of the PlaceHolder control.
MenuPlaceHolder.Controls.Add(newMenu)
End Sub
Sub NavigationMenu_MenuItemClick(ByVal sender As Object, ByVal e As MenuEventArgs)
' Display the text of the menu item selected by the user.
Message.Text = "You selected " & e.Item.Text & "."
End Sub
</script>
<html >
<head runat="server">
<title>MenuEventHandler Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>MenuEventHandler Example</h3>
<asp:placeholder id="MenuPlaceHolder"
runat="server"/>
<asp:sitemapdatasource id="MenuSource"
runat="server"/>
<hr/>
<asp:label id="Message"
runat="server"/>
</form>
</body>
</html>
<%@ 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)
{
// Create a new Menu control.
Menu newMenu = new Menu();
// Set the properties of the Menu control.
newMenu.ID = "NavigationMenu";
newMenu.Orientation = Orientation.Vertical;
newMenu.Target = "_blank";
// Specify the data source for the menu.
newMenu.DataSourceID = "MenuSource";
// Programmatically register the event-handling method
// for the MenuItemClick event of a Menu control.
newMenu.MenuItemClick += new MenuEventHandler(this.NavigationMenu_MenuItemClick);
// Add the Menu control to the Controls collection
// of the PlaceHolder control.
MenuPlaceHolder.Controls.Add(newMenu);
}
void NavigationMenu_MenuItemClick(Object sender, MenuEventArgs e)
{
// Display the text of the menu item selected by the user.
Message.Text = "You selected " + e.Item.Text + ".";
}
</script>
<html >
<head runat="server">
<title>MenuEventHandler Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>MenuEventHandler Example</h3>
<asp:placeholder id="MenuPlaceHolder"
runat="server"/>
<asp:sitemapdatasource id="MenuSource"
runat="server"/>
<hr/>
<asp:label id="Message"
runat="server"/>
</form>
</body>
</html>
Ceci est un exemple de données de plan de site de l'exemple précédent.
<siteMap>
<siteMapNode title="Home"
description="Home">
<siteMapNode title="Music"
description="Music">
<siteMapNode title="Classical"
description="Classical"/>
<siteMapNode title="Rock"
description="Rock"/>
<siteMapNode title="Jazz"
description="Jazz"/>
</siteMapNode>
<siteMapNode title="Movies"
description="Movies">
<siteMapNode title="Action"
description="Action"/>
<siteMapNode title="Drama"
description="Drama"/>
<siteMapNode title="Musical"
description="Musical"/>
</siteMapNode>
</siteMapNode>
</siteMap>
Informations de version
.NET FrameworkPris en charge dans : 4, 3.5, 3.0, 2.0
Plateformes
Windows 7, Windows Vista SP1 ou ultérieur, Windows XP SP3, Windows XP SP2 Édition x64, Windows Server 2008 (installation minimale non prise en charge), Windows Server 2008 R2 (installation minimale prise en charge avec SP1 ou version ultérieure), Windows Server 2003 SP2
Le .NET Framework ne prend pas en charge toutes les versions de chaque plateforme. Pour obtenir la liste des versions prises en charge, consultez Configuration requise du .NET Framework.
Voir aussi
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