How do I implement IEnumerable?

Question

I have a class that contains a static number of objects. This class needs to be frequently \'compared\' to other classes that will be simple List objects.

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Answer 1

You need to create an iterator that returns the Items that reside in the Sheet.

Using Iterators

public partial class Sheet
{
    public Item X{ get; set; }
    public Item Y{ get; set; }
    public Item Z{ get; set; }

    public IEnumerable<Item> EnumerateItems()
    {
        yield return X;
        yield return Y;
        yield return Z;
        // ...
    }
}

If you don't want to have to call the method you can do this.

public partial class Sheet : IEnumerable<Item>
{
    public Item X{ get; set; }
    public Item Y{ get; set; }
    public Item Z{ get; set; }

    public IEnumerator<Item> GetEnumerator()
    {
        yield return X;
        yield return Y;
        yield return Z;
        // ...
    }

    IEnumerator IEnumerator.GetEnumerator()
    {
        return GetEnumerator();
    }
}