//回测查询
public WindData bktquery(string qrycode, string qrytime, string options = "")
{
checkConnection();
object ofields, odata;
int errCode;
odata = wdc.bktquery(qrycode, qrytime, options, out ofields, out errCode);
return(formatWD(null, ofields, null, odata, errCode));
}
