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Categories / C# / Collections Data Structure

 

Groups items into same size lots

using System.Linq; using System.Diagnostics; namespace System.Collections.Generic {     public static class EnumeratorExtensions     {         /// <summary>         /// Groups items into same size lots.         /// </summary>         /// <typeparam name="T"></typeparam>         /// <param name="source">The source list of items.</param>         /// <param name="size">The maximum size of the groups to make.</param>         /// <returns>A list of list of items, where each list of items is no bigger than the size given.</returns>         public static IEnumerable<IEnumerable<T>> Clump<T>(this IEnumerable<T> 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<T>(source, size);         }         private static IEnumerable<IEnumerable<T>> ClumpIterator<T>(IEnumerable<T> 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;                 }             }         }     } }