What is the most elegant way to get a set of items by index from a collection?

Question

Given

IList indexes;
ICollection collection;

What is the most elegant way to extract all T in

Answer 1

Not sure how elegant this is, but here you go.

Since ICollection<> doesn't give you indexing I just used IEnumerable<>, and since I didn't need the index on the IList<> I used IEnumerable<> there too.

public static IEnumerable IndexedLookup(
    IEnumerable indexes, IEnumerable items)
{
    using (var indexesEnum = indexes.GetEnumerator())
    using (var itemsEnum = items.GetEnumerator())
    {
        int currentIndex = -1;
        while (indexesEnum.MoveNext())
        {
            while (currentIndex != indexesEnum.Current)
            {
                if (!itemsEnum.MoveNext())
                    yield break;
                currentIndex++;
            }

            yield return itemsEnum.Current;
        }
    }
}

EDIT: Just noticed my solution is similar to Erics.