Monday, May 31, 2004
« Services, Objects and People, Oh my! | Main | Dispose your Command objects! »

A few weeks ago I posted an entry about a solution to today's problem with serializing objects that declare events. It was pointed out that there's a better way to handle the list of delegates, and so here's a better version of the code.

  _
  Private mNonSerializable As EventHandler
  Private mSerializable As EventHandler

  Public Custom Event NameChanged As System.ComponentModel.EventHandler
    AddHandler(ByVal value As System.ComponentModel.EventHandler)
      If value.Target.GetType.IsSerializable Then
        mSerializable = CType([Delegate].Combine(mSerializable, value), EventHandler)

      Else
        mNonSerializable = CType([Delegate].Combine(mNonSerializable, value), EventHandler)
      End If
    End AddHandler

    RemoveHandler(ByVal value As System.ComponentModel.EventHandler)
      If value.Target.GetType.IsSerializable Then
        mSerializable = CType([Delegate].Remove(mSerializable, value), EventHandler)

      Else
        mNonSerializable = CType([Delegate].Remove(mNonSerializable, value), EventHandler)
      End If
    End RemoveHandler

    RaiseEvent(ByVal sender As Object, ByVal e As System.ComponentModel.EventArgs)
      If mNonSerializable IsNot Nothing Then mNonSerializable(sender, e)
      If mSerializable IsNot Nothing Then mSerializable(sender, e)
    End RaiseEvent
  End Event