OpenNos.GameObject.Group.GetNextOrderedCharacterId C# (CSharp) Méthode

        public long? GetNextOrderedCharacterId(Character character)
        {
            lock (this)
            {
                _order++;
                List<ClientSession> sessions = Characters.Where(s => Map.GetDistance(s.Character, character) < 50).ToList();
                if (_order > sessions.Count() - 1) // if order wents out of amount of ppl, reset it -> zero based index
                {
                    _order = 0;
                }

                if (!sessions.Any()) // group seems to be empty
                {
                    return null;
                }

                return sessions[_order].Character.CharacterId;
            }
        }