/// <summary>
/// Adds the specified listener to the specified source object for the event being managed.
/// </summary>
/// <param name="source">The source object to add listener to.</param>
/// <param name="listener">The listener to add.</param>
private static void AddListener(TSource source, IEventListener <T> listener)
{
WeakEvent <TSource, T, TEvent> .ProtectedAddListener(source, listener);
}
/// <summary>
/// Adds the specified listener for the event being managed.
/// </summary>
/// <param name="listener">The listener to add.</param>
private static void AddListener(IEventListener <T> listener)
{
WeakEvent <T, TEvent> .ProtectedAddListener(listener);
}