从基础数据读取涨跌停比列与昨结价

dataReadSuccess = False; dataSourceStatus = ""; // 直接读取已声明的数据源 rawSettlePrice = mysettleprice[0][0]; rawPriceLimit = mypricelimit[0][0]; LastSettlePrice = rawSettlePrice; LastPriceLimit = rawPriceLimit; if(LastSettlePrice > 0 && LastPriceLimit > 0) { dataReadSuccess = True; dataSourceStatus = "从数据源读取成功"; } else { dataReadSuccess = False; dataSourceStatus = "数据源读取失败，使用备用数据";怎么只能读到连续合约的，具体合约总是读取失败？