Question

I have a simple question.
There is a base class Product.
And derived classes as Bracelet, Earring and Ring.
But ring class has an extra property.

How am I going to reach that size property and use it in a method in below code.

public class Product
{
    public int id;
    public string title;
}

public class Bracelet : Product
{

}

public class Earring : Product
{

}

public class Ring : Product
{
    public int size;
}

Product product;
if(category = 1) // this is a  Bracelet
{
    product = new Bracelet();
}
else if(category = 2) // this is a Earring
{
    product = new Earring();
}
else if(category = 3) // Wola, this is a ring
{
    product = new Ring();
    product.size = 4; // I cant reach size.. I need to assign size of the ring to decrease stock correctly.
}

product.decreaseStock();

Answer 1

Just declare the value locally first:

else if (category == 3) 
{
    var ring = new Ring();
    ring.size = 4;
    product = ring;
}

This way, you have access to the variable as a Ring within your if block, but it also assigns it to the more general product variable too.

Alternatively, you can just use initializer syntax:

else if (category == 3) 
{
    product = new Ring { size = 4 };
}