那么在Microsoft开发团队里面,这个规则是“对于钱,总是十进制”,因为如果是的话：
Namespace: Microsoft.VisualBasic Assembly: Microsoft.VisualBasic (in Microsoft.VisualBasic.dll)
Financial.IPmt和所有其他方法将接收/返回十进制,而不是双倍.
我应该使用其他图书馆来处理财务问题吗？如果是的话,你能指点一些好的(C#使用)吗？
解决方法
你可以使用这个类：
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,FinancialEnumDueDate.EndOfPeriod) * Rate);
}
public static decimal PPmt(decimal Rate,FinancialEnumDueDate Due)
{
if ((Per <= 0) || (Per >= (NPer + 1)))
{
throw new ArgumentException("Argument 'Per' is not valid.");
}
decimal num2 = Pmt(Rate,Due);
decimal num = IPmt(Rate,Per,Due);
return (num2 - num);
}
static decimal FV_Internal(decimal Rate,decimal Pmt,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,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
}
