/// <summary>
/// 將小數(shù)值按指定的小數(shù)位數(shù)截?cái)?
/// </summary>
/// <param name="d">要截?cái)嗟男?shù)</param>
/// <param name="s">小數(shù)位數(shù)，s大于等于0，小于等于28</param>
/// <returns></returns>
public static decimal ToFixed(decimal d, int s)
{
decimal sp = Convert.ToDecimal(Math.Pow(10, s));

if (d < 0)
return Math.Truncate(d) + Math.Ceiling((d - Math.Truncate(d)) * sp) / sp;
else
return Math.Truncate(d) + Math.Floor((d - Math.Truncate(d)) * sp) / sp;
}

/// <summary>
/// 將雙精度浮點(diǎn)值按指定的小數(shù)位數(shù)截?cái)?
/// </summary>
/// <param name="d">要截?cái)嗟碾p精度浮點(diǎn)數(shù)</param>
/// <param name="s">小數(shù)位數(shù)，s大于等于0，小于等于15</param>
/// <returns></returns>
public static double ToFixed(double d, int s)
{
double sp = Math.Pow(10, s);

if (d < 0)
return Math.Truncate(d) + Math.Ceiling((d - Math.Truncate(d)) * sp) / sp;
else
return Math.Truncate(d) + Math.Floor((d - Math.Truncate(d)) * sp) / sp;
}