Question

I have the method Process(IEnumerable<Record> records) which can take UP TO but NO MORE THAN 3 records at a time. I have hundreds of records, so I need to pass in groups. I do this:

var _Records = Enumerable.Range(1, 16).ToArray();
for (int i = 0; i < int.MaxValue; i += 3)
{
    var _ShortList = _Records.Skip(i).Take(3);
    if (!_ShortList.Any())
        break;
    Process(_ShortList);
}
// TODO: finish

It works, but… is there a better way?

Answer 1

You may use this extension method:

public static IEnumerable<IEnumerable<T>> Split<T>(this IEnumerable<T> source, int chunkSize)
{
    return source
        .Select((value, i) => new { Index = i, Value = value })
        .GroupBy(item => item.Index % chunkSize)
        .Select(chunk => chunk.Select(item => item.Value));
}

It splits a source collection of items into several chunks with given size.
So your code will look next:

foreach (var chunk in Enumerable.Range(1, 16).Split(3))
{
    Process(chunk);
}