static IEnumerable<IEnumerable<TSource>> Slice<TSource>(this IEnumerable<TSource> source, int n) { var buf = new TSource[n]; int i = 0; foreach (var item in source) { buf[i++] = item; if (i == n) { i = 0; yield return buf; } } if (i != 0) { yield return buf.Take(i); } }