Map with variable number of lists in C#

gistfile1.cs

  static IEnumerable<T> Map<T>(this Func<IEnumerable<T>, T> f, params IEnumerable<T>[] arr)
  {
    var enums = Array.ConvertAll(arr, x => x.GetEnumerator());
    try
    {
      while (enums.All(x => x.MoveNext()))
      {
        yield return f(enums.Select(x => x.Current));
      }
    }
    finally
    {
      foreach (var e in enums) e.Dispose();
    }
  }