/// <summary>
/// 保留小数位
/// </summary>
/// <param name="obj">数量</param>
/// <param name="len">保留小数位数</param>
/// <param name="mathType">舍入类型</param>
/// <returns></returns>
public static decimal KeepDecimal(object obj, int len, MathType mathType = MathType.Round)
{
decimal result = Utils.ToDecimal(obj);
switch (mathType)
{
case MathType.Floor:
return(Math.Floor((decimal)Math.Pow(10, len) * result) / (decimal)Math.Pow(10, len));
case MathType.Ceil:
return(Math.Ceiling((decimal)Math.Pow(10, len) * result) / (decimal)Math.Pow(10, len));
case MathType.Round:
default:
return(Math.Round(result, len, MidpointRounding.AwayFromZero));
}
}
