ComponentEventHandler Delegate
Assembly: System (in system.dll)
'Declaration <ComVisibleAttribute(True)> _ Public Delegate Sub ComponentEventHandler ( _ sender As Object, _ e As ComponentEventArgs _ ) 'Usage Dim instance As New ComponentEventHandler(AddressOf HandlerMethod)
/** @delegate */ /** @attribute ComVisibleAttribute(true) */ public delegate void ComponentEventHandler ( Object sender, ComponentEventArgs e )
Not applicable.
Parameters
- sender
The source of the event.
- e
A ComponentEventArgs that contains the event data.
When you create a ComponentEventHandler 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.
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| The HostProtectionAttribute attribute applied to this class has the following Resources property value: SharedState. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes. |
The following example demonstrates registering a ComponentEventHandler and handling the ComponentAdded, ComponentAdding, ComponentRemoved and ComponentRemoving events.
Public Sub LinkComponentEvent(ByVal changeService As IComponentChangeService) ' Registers an event handler for the ComponentAdded, ' ComponentAdding, ComponentRemoved, and ComponentRemoving events. AddHandler changeService.ComponentAdded, AddressOf Me.OnComponentEvent AddHandler changeService.ComponentAdding, AddressOf Me.OnComponentEvent AddHandler changeService.ComponentRemoved, AddressOf Me.OnComponentEvent AddHandler changeService.ComponentRemoving, AddressOf Me.OnComponentEvent End Sub Private Sub OnComponentEvent(ByVal sender As Object, ByVal e As ComponentEventArgs) ' Displays changed component information on the console. If (e.Component.Site IsNot Nothing) Then Console.WriteLine(("Name of the component related to the event: " + e.Component.Site.Name)) End If End Sub
public void LinkComponentEvent(IComponentChangeService changeService)
{
// Registers an event handler for the ComponentAdded,
// ComponentAdding, ComponentRemoved, and ComponentRemoving events.
changeService.add_ComponentAdded(new ComponentEventHandler(this.
OnComponentEvent));
changeService.add_ComponentAdding(new ComponentEventHandler(this.
OnComponentEvent));
changeService.add_ComponentRemoved(new ComponentEventHandler(this.
OnComponentEvent));
changeService.add_ComponentRemoving(new ComponentEventHandler(this.
OnComponentEvent));
} //LinkComponentEvent
private void OnComponentEvent(Object sender, ComponentEventArgs e)
{
// Displays changed component information on the console.
if (e.get_Component().get_Site() != null) {
Console.WriteLine("Name of the component related to the event: "
+ e.get_Component().get_Site().get_Name());
}
Console.WriteLine("Type of the component related to the event: "
+ e.get_Component().GetType().get_FullName());
} //OnComponentEvent
Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.
Note: