internal void AddLimitOrder(ILimitOrder limitOrder) { var limitOrderAction = limitOrder.OrderAction(); var orderBookLine = _orderBookLines.FirstOrDefault(itm => itm.OrderAction == limitOrderAction && AssetPair.PricesAreTheSame(itm.Price, limitOrder.Price)); if (orderBookLine == null) { orderBookLine = OrderBookLine.Create(limitOrder.Price, limitOrder.RemainingVolume, limitOrderAction); _orderBookLines.Add(orderBookLine); } else { orderBookLine.Volume += limitOrder.RemainingVolume; } }