成员的完整列表，这些成员属于 CThostFtdcBrokerUserEventField,包括所有继承而来的类成员

BrokerID	CThostFtdcBrokerUserEventField
EventDate	CThostFtdcBrokerUserEventField
EventSequenceNo	CThostFtdcBrokerUserEventField
EventTime	CThostFtdcBrokerUserEventField
InstrumentID	CThostFtdcBrokerUserEventField
InvestorID	CThostFtdcBrokerUserEventField
UserEventInfo	CThostFtdcBrokerUserEventField
UserEventType	CThostFtdcBrokerUserEventField
UserID	CThostFtdcBrokerUserEventField