public bool Buy(string strWKN)
{
WorkDate today = this.RuleEngineInfo.Today;
Depot depot = this.RuleEngineInfo.Depot;
double dPrice = DBEngine.GetInstance().GetPrice(strWKN, today);
int nQuantity = (int)(depot.Cash / dPrice);
depot.Buy(strWKN, nQuantity, today, dPrice);
return(true);
}