Share via

ToolboxComponentsCreatingEventHandler Delegate


Represents the method that handles the ComponentsCreating event.

public delegate void ToolboxComponentsCreatingEventHandler(System::Object ^ sender, ToolboxComponentsCreatingEventArgs ^ e);
public delegate void ToolboxComponentsCreatingEventHandler(object sender, ToolboxComponentsCreatingEventArgs e);
type ToolboxComponentsCreatingEventHandler = delegate of obj * ToolboxComponentsCreatingEventArgs -> unit
Public Delegate Sub ToolboxComponentsCreatingEventHandler(sender As Object, e As ToolboxComponentsCreatingEventArgs)



The source of the event.


The following example code provides a method that attaches an event handler for the ComponentsCreating event of a ToolboxItem, and a ToolboxComponentsCreatingEventHandler event handler method that writes the name of the type of the component that is to receive the new component or components to the Console when the event handler is raised by a ComponentsCreating event.

   [PermissionSetAttribute(SecurityAction::Demand, Name="FullTrust")]
   void LinkToolboxComponentsCreatingEvent( ToolboxItem^ item )
      item->ComponentsCreating +=
         gcnew ToolboxComponentsCreatingEventHandler( this, &Form1::OnComponentsCreating );

   void OnComponentsCreating( Object^ sender, ToolboxComponentsCreatingEventArgs^ e )
      // Displays ComponentsCreating event information on the Console.
      Console::WriteLine( "Name of the class of the root component of " +
         "the designer host receiving new components: " +
         e->DesignerHost->RootComponentClassName );
public void LinkToolboxComponentsCreatingEvent(ToolboxItem item)
    item.ComponentsCreating += new ToolboxComponentsCreatingEventHandler(this.OnComponentsCreating);

private void OnComponentsCreating(object sender, ToolboxComponentsCreatingEventArgs e)
    // Displays ComponentsCreating event information on the Console.
    Console.WriteLine("Name of the class of the root component of " +
    "the designer host receiving new components: " +
Public Sub LinkToolboxComponentsCreatingEvent(ByVal item As ToolboxItem)
    AddHandler item.ComponentsCreating, AddressOf Me.OnComponentsCreating
End Sub

Private Sub OnComponentsCreating(ByVal sender As Object, ByVal e As ToolboxComponentsCreatingEventArgs)
    ' Displays ComponentsCreating event information on the Console.
    Console.WriteLine(("Name of the class of the root component of the designer host receiving new components: " + e.DesignerHost.RootComponentClassName))
End Sub


When you create a ToolboxComponentsCreatingEventHandler 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 Handling and Raising Events.

Extension Methods


Gets an object that represents the method represented by the specified delegate.

Applies to

See also