public sealed class WeakEvent<T> : WeakMulticastDelegate<T>
where T : class

Public NotInheritable Class WeakEvent(Of T As Class)
	Inherits WeakMulticastDelegate(Of T)

generic<typename T>
where T : ref class
public ref class WeakEvent sealed : public WeakMulticastDelegate<T>

[<SealedAttribute>]
type WeakEvent<'T when 'T : not struct> =  
    class
        inherit WeakMulticastDelegate<'T>
    end

class MyEventSource
{
  private readonly WeakEvent<EventHandler<EventArgs>> _myEvent = new WeakEvent<EventHandler<EventArgs>>();

  public event EventHandler<EventArgs> MyEvent
  {
    add { _myEvent.Add(value); }
    remove { _myEvent.Remove(value); }
  }

  protected virtual void OnMyEvent(EventArgs eventArgs)
  {
    _myEvent.Invoke(this, eventArgs);
  }  
}