protected void ApplyChange(Event @event)
 {
     ApplyChange(@event, true);
 }
 private void ApplyChange(Event @event, bool isNew)
 {
     this.AsDynamic().Apply(@event);
     if (isNew) _changes.Add(@event);
 }
 public EventDescriptor(Guid aggregateId, Event @event, int version)
 {
     Event = @event;
     Version = version;
     AggregateId = aggregateId;
 }