void ReqQryInstrumentCommissionRate()
{
ThostFtdcQryInstrumentCommissionRateField req = new ThostFtdcQryInstrumentCommissionRateField();
req.BrokerID = BROKER_ID;
req.InstrumentID = INSTRUMENT_ID;
req.InvestorID = INVESTOR_ID;
int iResult = api.ReqQryInstrumentCommissionRate(req, ++iRequestID);
Console.WriteLine("--->>> 请求查询合约手续费率: " + ((iResult == 0) ? "成功" : "失败"));
}