In C#, how do I create a function , method of class monthlypayment to calculate all the details of a monthly payment?

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I have this class

C#

public class MonthlyPayment
    {
        public int Month { get; set; }
        public double InitialBalance { get; set; }
        public double MonthlyRate { get; set; }
        public double Interest { get; set; }
        public double Principal { get; set; }
        public double Insurance { get; set; }
        public double Commission { get; set; }
        public double TotalMonthly{ get; set; }
        public double CreditBalance { get; set; }
    }

And this list of the first manually created item

C#

public class CreditDataContext
    {
        public List<MonthlyPayment> MonthlyPayments { get; set; }
        public void LoadMonthlyPayments()
        {
            MonthlyPayments = new List<MonthlyPayment>();
            MonthlyPayment payment = null;
            payment = new MonthlyPayment()
            {
                Month = 0,
                InitialBalance = 0.00,
                MonthlyRate = 0.00,
               Interest = 0.00,
                Principal = 0.00,
                Insurance = 0.00,
                Commission = 200.00,
                TotalMonthly = 200.00,
                Credit Balance = 10000.00f
            };
            MonthlyPayments.Add(payment);

How do I create a method of class MonthlyPayment to calculate all the details of a monthly payment?
I should use a for(i=1,...,12)?

What I have tried:

I tried to create the function ,but it does work.

C#

public MonthlyPayment  Calculate(int i)
        {
            MonthlyPayment x = new MonthlyPayment();
            x.Month = i;
            x.InitialBalance =10.000f ;
            x.Interest = ((9.75 /100) / 12) * x.InitialBalance;
            double v = 1 + x.Interest;
            x.MonthlyRate = (x.InitialBalance * x.Interest) / (1 - Math.Pow(v, -12));
            x.Principal = x.MonthlyRate - x.Interest;
            x.Insurance = (0.10 / 100) * x.InitialBalance;
            x.Commission = (0.04 / 100) * x.InitialBalance;
            x.TotalMonthly = x.Interest + x.Insurance + x.MonthlyRate;
            x.CreditBalance = x.InitialBalance - x.MonthlyRate;}
        }

Posted 2-May-21 10:13am

Member 15180481

Updated 2-May-21 11:27am

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OriginalGriff · Answer 1 · 2021-05-02T11:27:00

Why are you creating a new instance in your method, which gets thrown away at the end for the method when you return?

Since your Calculate method is non-static, it has an instance to work with: the current instance (which is also known as this - but in this example you don't need to use it explicitly).

For example, if I create a Fraction class:

C#

public class Fraction
   {
   public int Numerator;
   public int Denominator;
   public Fraction (int numerator, int denominator)
      {
      Numerator = numerator;
      Denominator = denominator;
      }
   }

I can add a method to evaluate the fraction as a decimal value:

C#

public double Evaluate()
   {
   return (double) Numerator / (double) Demoninator;
   }

This uses the values that were set when the class instance was created.

Your code can do the same: set the class instance values directly when you call your method:

C#

public MonthlyPayment  alculate(int i)
    {
    Month = i;
    InitialBalance =10.000f ;
    Interest = ((9.75 /100) / 12) * InitialBalance;
    double v = 1 + x.Interest;
...
    return this;
    }