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ActiveDesignerEventHandler Delegate

Represents the method that will handle the ActiveDesignerChanged event.

Namespace:  System.ComponentModel.Design
Assembly:  System (in System.dll)

'Declaration
<HostProtectionAttribute(SecurityAction.LinkDemand, SharedState := True)> _
Public Delegate Sub ActiveDesignerEventHandler ( _
	sender As Object, _
	e As ActiveDesignerEventArgs _
)
'Usage
Dim instance As New ActiveDesignerEventHandler(AddressOf HandlerMethod)

Parameters

sender
Type: System.Object

The source of the event.

e
Type: System.ComponentModel.Design.ActiveDesignerEventArgs

An ActiveDesignerEventArgs that contains the event data.

NoteNote:

The HostProtectionAttribute attribute applied to this type or member 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 ActiveDesignerChanged event is raised when the currently active document has been modified.

When you create an ActiveDesignerEventHandler 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.

The following example demonstrates registering an ActiveDesignerEventHandler and handling an ActiveDesignerChanged event.

Public Sub LinkActiveDesignerEvent(ByVal eventService As IDesignerEventService)
    ' Registers an event handler for the ActiveDesignerChanged event. 
    AddHandler eventService.ActiveDesignerChanged, AddressOf Me.OnActiveDesignerEvent
End Sub 

Private Sub OnActiveDesignerEvent(ByVal sender As Object, ByVal e As ActiveDesignerEventArgs)
    ' Displays changed designer information on the console.             
    If (e.NewDesigner.RootComponent.Site IsNot Nothing) Then
        Console.WriteLine(("Name of the component of the new active designer: " + e.NewDesigner.RootComponent.Site.Name))
    End If
    Console.WriteLine(("Type of the component of the new active designer: " + e.NewDesigner.RootComponentClassName))
    If (e.OldDesigner.RootComponent.Site IsNot Nothing) Then
        Console.WriteLine(("Name of the component of the previously active designer: " + e.OldDesigner.RootComponent.Site.Name))
    End If
    Console.WriteLine(("Type of the component of the previously active designer: " + e.OldDesigner.RootComponentClassName))
End Sub

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0
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