Unipluss.TransactionService.Models.Customer.GetIncludedTransactionCount C# (CSharp) Метод

        public int GetIncludedTransactionCount(string productId, DateTime? dt)
        {
            if (IncludedTransactions == null) return 0;

            int count = 0;
            foreach (var tItem in IncludedTransactions.Where(t => t.ProductID == productId))
            {
                if (dt.HasValue)
                {
                    if (dt >= tItem.DateStart && dt <= tItem.DateEnd)
                    {
                        count += tItem.IncludedAmount;
                    }
                }
                else
                {
                    var dtEnd = DateTime.UtcNow;
                    for (DateTime d = tItem.DateStart; d < dtEnd && d <= tItem.DateEnd; d = d.AddMonths(1))
                    {
                        count += tItem.IncludedAmount;
                    }
                }
            }

            return count;
        }