System.DateTimeParse.GetYearMonthOrder C# (CSharp) Méthode

        private static Boolean GetYearMonthOrder(String pattern, DateTimeFormatInfo dtfi, out int order)
        {
            int yearOrder   = -1;
            int monthOrder  = -1;
            int orderCount  =  0;

            bool inQuote = false;
            for (int i = 0; i < pattern.Length && orderCount < 2; i++)
            {
                char ch = pattern[i];
                if (ch == '\'' || ch == '"')
                {
                    inQuote = !inQuote;
                }

                if (!inQuote)
                {
                    if (ch == 'y')
                    {
                        yearOrder = orderCount++;

                        //
                        // Skip all year pattern charaters.
                        //
                        for(; i+1 < pattern.Length && pattern[i+1] == 'y'; i++)
                        {
                        }
                    }
                    else if (ch == 'M')
                    {
                        monthOrder = orderCount++;
                        //
                        // Skip all month pattern characters.
                        //
                        for(; i+1 < pattern.Length && pattern[i+1] == 'M'; i++)
                        {
                        }
                    }
                }
            }

            if (yearOrder == 0 && monthOrder == 1)
            {
                order = ORDER_YM;
                return true;
            }
            if (monthOrder == 0 && yearOrder == 1)
            {
                order = ORDER_MY;
                return true;
            }
            order = -1;
            return false;
        }