public bool Serialize(object _object, Type _useType, XmlElement _parentNode, CSerializer _serializer) { var f = (CFriend)_object; _serializer.IgnoreField("FriendPerson"); var idx = Array.IndexOf(CBigPerson.People, f.FriendPerson); XmlExtensions.AddElement(_parentNode, "FriendPerson", idx); return(false); }