In C# , how do I change the function to display values calculated based on the previous item?

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I have this class

public class MonthlyPayment
    {
        public int Luna { get; set; }
        public double SoldInitial { get; set; }
        public double PlataLunara { get; set; }
        public double Dobanda { get; set; }
        public double Principal { get; set; }
        public double Asigurare { get; set; }
        public double Comision { get; set; }
        public double TotalLunar { get; set; }
        public double SoldCredit { get; set; }
    }

And this data context

public class CreditDataContext
    {
        public List<MonthlyPayment> MonthlyPayments { get; set; }
        public void LoadMonthlyPayments()
        {
            MonthlyPayments = new List<MonthlyPayment>();
            MonthlyPayment payment = null;
            payment = new MonthlyPayment()
            {
                Luna = 0,
                SoldInitial = 0.00,
                PlataLunara = 0.00,
                Dobanda = 0.00,
                Principal = 0.00,
                Asigurare = 0.00,
                Comision = 200.00,
                TotalLunar = 200.00,
                SoldCredit = 10000.00f,
            };
            MonthlyPayments.Add(payment);
            for(int i=1;i<=12;i++)
            {
                MonthlyPayments.Add(InitializeMyObject(i));
                    }
        }
       public MonthlyPayment InitializeMyObject(int i)
        {
            MonthlyPayment x = new MonthlyPayment();
            x.Luna = i;
            x.SoldInitial = 10000;
            x.Dobanda = ((9.75 / 100) / 12) * x.SoldInitial;
            double v = 1 + x.Dobanda;
            x.PlataLunara = (x.SoldCredit * x.Dobanda) / (1 - Math.Pow(v, -12));
            x.Principal = x.PlataLunara - x.Dobanda;
            x.Asigurare = (0.10 / 100) * x.SoldInitial;
            x.Comision = (0.04 / 100) * x.SoldInitial;
            x.TotalLunar = x.Dobanda + x.Asigurare + x.PlataLunara;
            x.SoldCredit = x.SoldInitial - x.PlataLunara;
            return x;
        }
    }

The problem is that displays the same value for each item in the list.
How do I change the function to display values calculated based on the previous item?

What I have tried:

I tried to acces de (i-1) element in the for.But does it work.

Posted 3-May-21 11:46am

Member 15180481

Updated 3-May-21 19:26pm

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OriginalGriff · Answer 1 · 2021-05-03T19:26:00

Solution 1

Pass the previous MonthlyPayment item to the InitializeMyObject method:

C#

previousMonth = MonthlyPayments.Add(InitializeMyObject(i, previousMonth));

public MonthlyPayment InitializeMyObject(int i, MonthlyPayment lastMonth)
   {
   MonthlyPayment x = new MonthlyPayment();
   ... you can use lastMonth to access the previous months values.

By the way ...

C#

MonthlyPayments.Add(payment);
for(int i=1;i<=12;i++)
{
    MonthlyPayments.Add(InitializeMyObject(i));
        }

Indent your code correctly!
And since you add a payment before the loop, you end up with thirteen months in your collection ...

Posted 3-May-21 19:26pm

OriginalGriff

Comments

Member 15180481 4-May-21 5:06am

I don't understarnd for what use
previousMonth = MonthlyPayments.Add(InitializeMyObject(i, previousMonth));
Can you explain?

OriginalGriff 4-May-21 5:24am

Which bit don't you understand?

Member 15180481 4-May-21 5:36am

Where exactly do I have to add previousMonth= MonthlyPayments.Add(InitializeMyObject(i, previousMonth));?
wherever I add it I have the error 'the name previousMonth does not exist in the current context'

OriginalGriff 4-May-21 6:19am

Oh come on, man!
It's an example: you are supposed to learn from it and implement it yourself...

Member 15180481 4-May-21 7:04am

In the end ,I solved it and it works.Thanks for help.

In C# , how do I change the function to display values ​​calculated based on the previous item?