Collection, IEnumerable, GetEnumerator, IEnumerator

new_gist_file

// Example adapted from MSDN showing how to use IEnumerable and IEnumerator

public class CollectionTestItem
{
    public CollectionTestItem(string Name, double Value)
    {
        this.Name = Name;
        this.Value = Value;
    }

    public string Name;
    public double Value;
}

public class CollectionTest : IEnumerable
{
    private CollectionTestItem[] m_items;
    public CollectionTest(CollectionTestItem[] pArray)
    {
        m_items = new CollectionTestItem[pArray.Length];

        for (int i = 0; i < pArray.Length; i++)
        {
            m_items[i] = pArray[i];
        }
    }

    IEnumerator IEnumerable.GetEnumerator()
    {
        return new CollectionTestEnum(m_items);
    }

}

public class CollectionTestEnum : IEnumerator
{
    public CollectionTestItem[] m_items;

    // Enumerators are positioned before the first element
    // until the first MoveNext() call.
    int position = -1;

    public CollectionTestEnum(CollectionTestItem[] list)
    {
        m_items = list;
    }

    public bool MoveNext()
    {
        position++;
        return (position < m_items.Length);
    }

    public void Reset()
    {
        position = -1;
    }

    public object Current
    {
        get
        {
            try
            {
                return m_items[position];
            }
            catch (IndexOutOfRangeException)
            {
                throw new InvalidOperationException();
            }
        }
    }
}


public class CollectionTestExample
{
    public void TryThisExample()
    {

        CollectionTestItem[] itemArray = new CollectionTestItem[3]
            {
                new CollectionTestItem("A", 1),
                new CollectionTestItem("B", 2),
                new CollectionTestItem("C", 3),
            };

        CollectionTest itemList = new CollectionTest(itemArray);
        foreach (CollectionTestItem p in itemList)
            Console.WriteLine(p.Name + " " + p.Value);
    }
}