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 }
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