C# array within an object within an array

Question

Here is a simplified version of my code:

   class House
{
    private string owner;
    private int[] roomArea = new int[10];

    public string Owner { get; set; }
    public int[] RoomArea { get; set; }
}

class Program
{
    static void Main(string[] args)
    {
        House[] london = new House[100];
        for (int i = 0; i < 100; i++)
        {
            london[i] = new House();
        }

        london[0].Owner = "Timmy";
        london[0].RoomArea[0] = 15; // Error points to this line

        Console.WriteLine("Room 1 in " + london[0].Owner + "s house has the area of " + london[0].RoomArea[0] + "square meters");


    }
}

I get the following error:

 Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object.

I've looked at this this question/solution, yet I can't pinpoint what's exactly wrong with my code.

RoomArea is not initialized. The RoomArea property is not using the roomArea private member, it is creating it's own member behind the scenes to store the values, however, you're not initializing it before trying to use it. — RJM
– RJM, Commented Oct 17, 2017 at 2:17

Sajeetharan · Accepted Answer · 2017-10-17 02:20:25Z

2

You need to initialize RoomArea. Even though you initialize inside the class it is creating it's own member , but in order to add values you need to initialize it

london[0].RoomArea  = new int[10];
london[0].RoomArea[0] = 15;

edited Oct 17, 2017 at 2:20

answered Oct 17, 2017 at 2:14

Sajeetharan

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