Question

The idea is simple. Make a struct for “Departments” of a store, give it a variable for naming (a string called “Department”), and a array to save all buys done in that department.

Now, I want that every time that I’m gonna save a buy on a specific Department, it auto-applies a discount based on department’s name and buy amount.

Now, the example class:

class Program
{
    struct Departments
    {
        public string Department;
        private double[] _buys;

        public double[] Buys
        {
            get { return _buys; }
            set
            {
                if (value > 100)
                {
                    if (Department == "CLOTH")
                    _buys = value * .95;
                    if (Department == "FOOD")
                    _buys = value * .90;
                    if (Department == "OTHER")
                    _buys = value * .97;
                }
                _buys = value;
            }
        }
    }

    static void Main()
    {
        var departments = new Departments[3];
        departments[0].Department = "CLOTH";
        departments[1].Department = "FOOD";
        departments[2].Department = "OTHER";
        departments[0].Buys = new double[5];
        departments[0].Buys[0] = 105;
    }
}

Note the line departments[0].Buys[0] = 105, that’s the way that I want to save bought things, “Code-Simple”…

Now, note the property Buys of the struct, it’s an “Array Property”. Then, when I use the value > 100 condition it gives an obvious error, can’t cast from double to double[].

The question… how can I write a right condition for value > 100, what else must be put on the stuct to achieve this?

I’ve tried with “Indexers”, but as long as I’ve tried I can’t make it take assignemts via departments[0].Buys[0] = 105 in the right way.

Please note that I wanna keep this schema, specially for the facility of simply say departments[0].Buys[0] = 105 to asing buyings

EDIT:

The previous struct “Departments” is done for example-purposes only. I won’t answers about making it by another way to have right “Departments”, I want an answer of how to make the set parameter work on individual elements of arrays

Answer 1

One more potential solution is to make another class for the _buys array:

class Buys
{
    private double[] _buys;

    public Buys (int capacity)
    {
        _buys = new double[capacity];
    }

    public double this[int index]
    {
        get { return _buys; }
        set 
        {
            if (value > 100)
            {
                if (Department == "CLOTH")
                    value = value * .95;
                if (Department == "FOOD")
                    value = value * .90;
                if (Department == "OTHER")
                    value = value * .97;
            }
            _buys = value;
        }
    }
}

struct Departments
{
    public string Department;
    public Buys Buys;
}

static void Main()
{
    var departments = new Departments[3];
    departments[0].Department = "CLOTH";
    departments[1].Department = "FOOD";
    departments[2].Department = "OTHER";
    departments[0].Buys = new Buys(5);
    departments[0].Buys[0] = 105;
}