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根据每个属性用对象填充列表

loops list c#

0

MrProgram · 技术社区 · 12 年前

我有一个列表,希望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);
    }

计算:

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; }
}

2 回复 | 直到 12 年前

1

2

Tim Schmelter 12 年前

您可以使用列表的索引访问上次插入的:

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

同样的另一种方式: Enumerable.Last :

var calcBefore = cList.Last();

因为您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);
}

根据 Date ,我想你想增加一个月,使用 DateTime.AddMonths :

Date = DateTime.Parse(calcBefore.Date).AddMonths(1).ToString();

然而,我不会使用 String 对于 DateTime 完全

2

0

Anthony 12 年前

不要以为你会使用循环,

您需要做的就是让构造函数将Calculation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
   }
}

然后当调用新对象时,传入当前列表中的最后一个对象

var newObj=新计算(cList[cList.Length-1]);