Indexer Example

AnObject.cs

public class AnObject
{
    public int Id { get; set; }
    public string Name { get; set; }

    public AnObject(int id, string name)
    {
        this.Id = id;
        this.Name = name;
    }

    public AnObject()
    {
    }

    public string Play()
    {
        return "I played!";
    }
}

Class1.cs

public class Class1
{
    public static void Main(String[] args)
    {
        TheObjects objs = new TheObjects();

        objs.Add(new AnObject(1, "Name"));

        Console.WriteLine(objs.ToString());
        Console.ReadKey();
    }
}

TheObjects.cs

public class TheObjects
{
    public AnObject[] objects = new AnObject[2];
    private int size = 0;

    public TheObjects()
    {
    }

    public override string ToString()
    {
        return String.Format("{0}: {1}; {2}", this[0].Id, this[0].Name, this[0].Play());
    }

    public void Add(AnObject obj)
    {
        if (this.size == objects.Length)
            throw new IndexOutOfRangeException();
        objects[this.size] = obj;
    }

    public AnObject this[int index]
    {
        get
        {
            return objects[index];
        }
        set
        {
            objects[index] = value;
        }
    }
}