Split List into Sublists with LINQ

Question

Is there any way I can separate a List into several separate lists of SomeObject, using the item index as the delimiter of each s

Answer 1

I wrote a Clump extension method several years ago. Works great, and is the fastest implementation here. :P

/// 

/// Clumps items into same size lots.
/// 
/// 
/// The source list of items.
/// The maximum size of the clumps to make.
/// A list of list of items, where each list of items is no bigger than the size given.
public static IEnumerable> Clump(this IEnumerable source, int size)
{
    if (source == null)
        throw new ArgumentNullException("source");
    if (size < 1)
        throw new ArgumentOutOfRangeException("size", "size must be greater than 0");

    return ClumpIterator(source, size);
}

private static IEnumerable> ClumpIterator(IEnumerable source, int size)
{
    Debug.Assert(source != null, "source is null.");

    T[] items = new T[size];
    int count = 0;
    foreach (var item in source)
    {
        items[count] = item;
        count++;

        if (count == size)
        {
            yield return items;
            items = new T[size];
            count = 0;
        }
    }
    if (count > 0)
    {
        if (count == size)
            yield return items;
        else
        {
            T[] tempItems = new T[count];
            Array.Copy(items, tempItems, count);
            yield return tempItems;
        }
    }
}