C# 根据每个对象的属性，用对象填充列表

我有一个列表，我想使用列表中创建的最新对象来计算下一个对象属性。我不知道如何编写这样的循环。你能帮我吗

public ActionResult ShowDetail(DateTime startdate, double PresentValue, double InterestRate, double FutureValue, int PaymentPeriods)
    {
        List<Calculation> cList = new List<Calculation>();
        Calculation calc = new Calculation();
        calc.Date = startdate.ToShortDateString();
        calc.InvoiceAmount = 2000;
        calc.InterestRate = InterestRate;
        calc.InterestAmount = (PresentValue * InterestRate / 360 * 30);
        calc.Amortization = (2000 - (PresentValue * InterestRate / 360 * 30));
        calc.PresentValue = PresentValue;
        cList.Add(calc);
        for (int i = 0; i < PaymentPeriods; i++)
        {
            cList.Add(new Calculation()
                {
                    var calcBefore = cList.GetLastObject //Some how I want to take the object before the one i want to create
                    cList.Add(new Calculation()
                    {
                        Date = calcBefore.Date.Add(1).Month() //something like this
                        InvoiceAmount = calcBefore.InvoiceAmount
                        InterestRate = calcBefore.InterestRate
                        InterestAmount = (calcBefore.PresentValue * InterestRate / 360 * 30) //I want to take the presentvalue from the object before in the List and use that to calculate the the next InterestAmount
                        //And so on
                    }
                });
        }

        return PartialView("ShowDetail", cList);
    }

---

您可以使用列表的索引访问上次插入的：

var calcBefore = cList[cList.Count - 1];

另一种实现相同功能的方法：

可枚举。最后一个

：

var calcBefore = cList.Last();

因为在循环之前添加了一个，所以列表不是空的，这是安全的

以下是完整的循环：

for (int i = 0; i < PaymentPeriods; i++)
{
    calc = new Calculation();
    Calculation calcBefore = cList[cList.Count - 1];
    calc.Date = DateTime.Parse(calcBefore.Date).AddMonths(1).ToString();
    calc.InvoiceAmount = calcBefore.InvoiceAmount;
    calc.InterestRate = calcBefore.InterestRate;
    calc.InterestAmount = (calcBefore.PresentValue * InterestRate / 360 * 30);//I want to take the presentvalue from the object before in the List and use that to calculate the the next InterestAmount
    cList.Add(calc);
}

---

但是，我根本不会使用

字符串
作为
日期时间
。
不要认为您会使用循环

您需要做的就是让构造函数将计算对象作为参数

然后你会做一些类似的事情

public partial class Calculation
{
   public string Date { get; set; }
   public double InvoiceAmount { get; set; }
   public double InterestRate { get; set; }
   public double InterestAmount { get; set; }
   public double Amortization { get; set; }
   public double PresentValue { get; set; }

public   Calculation (Calculation as calculation(
   {
    ..  set you prop
   }
}

然后在调用新对象时，传入当前列表中的最后一个对象

var newObj=新计算（cList[cList.Length-1]）
 “我不知道如何编写这样做的循环。”？将编辑文本以便您可以更轻松地使用该字符串。该字符串仅用于测试，但现在将对其进行更改：）也将测试您的代码
Date = DateTime.Parse(calcBefore.Date).AddMonths(1).ToString();

public partial class Calculation
{
   public string Date { get; set; }
   public double InvoiceAmount { get; set; }
   public double InterestRate { get; set; }
   public double InterestAmount { get; set; }
   public double Amortization { get; set; }
   public double PresentValue { get; set; }

public   Calculation (Calculation as calculation(
   {
    ..  set you prop
   }
}