Zip N IEnumerables together? Iterate over them simultaneously?

Question

I have:-

IEnumerable> items;

and I\'d like to create:-

IEnumerable> r         


        

Answer 1

Based on David B's answer, this code should perform better:

public static IEnumerable> JaggedPivot(
    this IEnumerable> source)
{
    var originalEnumerators = source.Select(x => x.GetEnumerator()).ToList();
    try
    {
        var enumerators =
            new List>(originalEnumerators.Where(x => x.MoveNext()));

        while (enumerators.Any())
        {
            yield return enumerators.Select(x => x.Current).ToList();
            enumerators.RemoveAll(x => !x.MoveNext());
        }
    }
    finally
    {
        originalEnumerators.ForEach(x => x.Dispose());
    }
}

The difference is that the enumerators variable isn't re-created all the time.