“为了金钱,总是十进制"? [英] "For money, always decimal"?
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问题描述
好吧,"为了金钱,总是十进制"规则在Microsoft开发团队中没有应用,因为如果是这样的话:
Well, the rule "For money, always decimal" isn't applied inside the Microsoft development team, because if it was:
Namespace: Microsoft.VisualBasic
Assembly: Microsoft.VisualBasic (in Microsoft.VisualBasic.dll)
Financial.IPmt
和所有其他方法将直接接收/返回decimal
而不是double
.
Financial.IPmt
and all the other methods would receive/return decimal
and not double
as it is.
现在,我想知道是否可以使用这些方法而不必担心出现全面错误吗?
Now I wonder if I can use these methods without worry with round mistakes?
我应该使用其他图书馆来处理财务问题吗?如果是,您能给我指出一些好的(供C#
使用)吗?
Should I use some other libraries to work with finances? If yes, could you point me some good ones (for C#
use) ?
推荐答案
您可以使用此类:
public class Financial
{
#region Methods
public static decimal IPmt(decimal Rate, decimal Per, decimal NPer, decimal PV, decimal FV, FinancialEnumDueDate Due)
{
decimal num;
if (Due != FinancialEnumDueDate.EndOfPeriod)
{
num = 2;
}
else
{
num = 1;
}
if ((Per <= 0) || (Per >= (NPer + 1)))
{
//Argument_InvalidValue1=
throw new ArgumentException("Argument 'Per' is not a valid value.");
}
if ((Due != FinancialEnumDueDate.EndOfPeriod) && (Per == 1))
{
return 0;
}
decimal pmt = Pmt(Rate, NPer, PV, FV, Due);
if (Due != FinancialEnumDueDate.EndOfPeriod)
{
PV += pmt;
}
return (FV_Internal(Rate, Per - num, pmt, PV, FinancialEnumDueDate.EndOfPeriod) * Rate);
}
public static decimal PPmt(decimal Rate, decimal Per, decimal NPer, decimal PV, decimal FV, FinancialEnumDueDate Due)
{
if ((Per <= 0) || (Per >= (NPer + 1)))
{
throw new ArgumentException("Argument 'Per' is not valid.");
}
decimal num2 = Pmt(Rate, NPer, PV, FV, Due);
decimal num = IPmt(Rate, Per, NPer, PV, FV, Due);
return (num2 - num);
}
static decimal FV_Internal(decimal Rate, decimal NPer, decimal Pmt, decimal PV, FinancialEnumDueDate Due)
{
decimal num;
if (Rate == 0)
{
return (-PV - (Pmt * NPer));
}
if (Due != FinancialEnumDueDate.EndOfPeriod)
{
num = 1 + Rate;
}
else
{
num = 1;
}
decimal x = 1 + Rate;
decimal num2 = (decimal)Math.Pow((double)x, (double)NPer);
return ((-PV * num2) - (((Pmt / Rate) * num) * (num2 - 1)));
}
static decimal Pmt(decimal Rate, decimal NPer, decimal PV, decimal FV, FinancialEnumDueDate Due)
{
decimal num;
if (NPer == 0)
{
throw new ArgumentException("Argument NPer is not a valid value.");
}
if (Rate == 0)
{
return ((-FV - PV) / NPer);
}
if (Due != FinancialEnumDueDate.EndOfPeriod)
{
num = 1 + Rate;
}
else
{
num = 1;
}
decimal x = Rate + 1;
decimal num2 = (decimal)Math.Pow((double)x, (double)NPer);
return (((-FV - (PV * num2)) / (num * (num2 - 1))) * Rate);
}
#endregion Methods
}
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