/// <summary>
/// Registers the handler.
/// </summary>
/// <typeparam name="TEvent">The type of the event.</typeparam>
/// <param name="handler">The handler.</param>
public void RegisterHandler <TEvent>(Action <TEvent> handler)
where TEvent : Event
{
var castHandler = ExpressionEx.CovariantCast <Event, TEvent>(e => handler(e)); RegisterHandler(typeof(TEvent), castHandler);
}
