C#四捨五入的語法

doublecoun = Math.Round(doublecoun, 3, MidpointRounding.AwayFromZero);

四捨五入語法如下，
doublecoun四捨五入的Double值，
3為四捨五入至第幾位。
Math.Round(doublecoun, 3, MidpointRounding.AwayFromZero)