Breaking up a collection into smaller fixed size collections with C# .NET

Occasionally you may need to break up a large collection into smaller size collections or groups. Consider the following integer list:

List<int> ints = new List<int>() { 1, 4, 2, 5, 2, 6, 5, 43, 6, 234, 645, 2, 12, 45, 13, 5, 3 };

The goal is to break up this list into groups of size 5 and if necessary an additional list for the remaining elements. The following generic method will do the trick:

private IEnumerable<IEnumerable<T>> GroupElements<T>(List<T> fullList, int batchSize)
	int total = 0;
	while (total < fullList.Count)
		yield return fullList.Skip(total).Take(batchSize);
		total += batchSize;

Call the method as follows:

var intGroups = GroupElements(ints, 5);
foreach (var group in intGroups)
	Debug.WriteLine(string.Join(",", group.ToArray()));

This will give the following printout:


View the list of posts on LINQ here.


About Andras Nemes
I'm a .NET/Java developer living and working in Stockholm, Sweden.

One Response to Breaking up a collection into smaller fixed size collections with C# .NET

  1. przemo says:

    That’s nice, but wouldn’t it be even nicer (and more in line with LINQ in general) if this was written as an extension method?

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