Question

My problem is the following, I have a class, let’s call it Theatre.

This Theatre has a constructor where I specify the amount Seats that this Theatre has.

The Show class, has an collection of Seats, each with its own properties like bool Empty.

So summing up the code:

class Theatre
{
    public Theatre(int numberOfSeats)
    {
        this.numberOfSeats = numberOfSeats;
    }
}

Lets say we instantiate it somewhere to 100.

Theatre myTheatre = new Theatre(100);

For the Show class:

class Show
{
    List<Seats> listOfSeats = new List<Seats>();
    public Show()
    {
        for (int i = 0; i < 100; i++) //  <---- And here is my problem!!
        {
            //Code to add to list
        }
    }
}

My problem is I don’t know to get rid of that 100.

I would like to have something like myTheatre.NumberOfSeats, but I’m not really sure how would that work.

My problem is, I have already instantiated myTheatre in another class, so I would have to make a new theatre inside Show, only to get the number of seats, I would use something like composition and deletagation, but that would clearly violate ISP.

But even that has a problem, since, when I make the new Theatre, I would have to put 100 as a paratmer and, if that were to change, I would have to manually change it.

So my questions are:

• Am I missing something obvious? (Very likely)
• What approach would you recommend?
• Is there something like a shared variable across classes? (Don’t want to use the word global, because I’m not sure that’s what I want, but it might).

As an obvious clarification, the above is not the actual code, just a representation to clarify the situation.

Answer 1

This is how you solve it. Pass the Theatre as an argument to Show

 class Theatre
    {
        public Theatre(int numberOfSeats)
        {
            NumberOfSeats = numberOfSeats;
        }
        public int NumberOfSeats { get; private set; }
    }

    class Show
    {
        List<Seats> listOfSeats = new List<Seats>();

        public Show(Theatre theatre)
        {
            for (int i = 0; i < theatre.NumberOfSeats; i++) //  <---- And here is my problem!!
            {
                //Code to add to list
            }
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            Theatre myTheatre = new Theatre(100);
            Show myShow = new Show(myTheatre);
        }
    }