Question

I’m currently developing an app using ASP.NET MVC3 and Entity Framework 4.1 Code First and also trying to apply DDD little by little since I’m only began learning it.

I have a model of :

public class ClassA
{
    public decimal MonthlyRate { get; set; }
    public virtual decimal DailyRate 
    { 
       get { return this.MonthlyRate / 30; }
       private set { }
    }
}

Right now, this code works but what if I’ll be having a flag (which will be checked by user) on the View triggering for a new computation. Let’s say the flag instead of dividing it by 30, monthly rate now will be divided by 5. Any suggestions? Thanks.

Answer 1

interface IDivideLogic
{
    int DivideNumber{get;set;}
}

class DivideLogic : IDivideLogic
{
    public DivideLogic()
    {
        DivideNumber = 30;
    }
    public DivideLogic(int divideNumber)
    {
        DivideNumber = divideNumber;
    }
    public int DivideNumber{get;set;}
}

public class ClassA
{
    public IDivideLogic DivideLogic {get;set;}
    public decimal MonthlyRate { get; set; }
    public virtual decimal DailyRate 
    { 
       get { return this.MonthlyRate / DivideLogic.DivideNumber; }
       private set { }
    }
}

then you can switch this when you want

ClassA obj = new ClassA();
obj.DivideLogic  = new DivideLogic(5);

This works well for more complicated situations. In your situation it may be too over designed. Hope you get the point