private static string NormalizeCode(string code)
        {
            StockExchangeId exchangeId = StockName.GetExchangeId(code);

            string prefix = exchangeId == StockExchangeId.ShenzhenExchange ? "sz" : "sh";

            return(prefix + code);
        }
        public static string DefaultAbbrevationMarketFormatter(StockExchangeId market)
        {
            switch (market)
            {
            case StockExchangeId.ShanghaiExchange:
                return("sh");

            case StockExchangeId.ShenzhenExchange:
                return("sz");

            default:
                return("");
            }
        }