Question

I have a string of text with items separated by a semicolon. There could be one, a couple, or hundreds of these items.

I need to process these items in batches of up to 100. I can use an array or a list, either is fine. However, LINQ is not an option.

I can come up with clunky ways of doing this, but is there a way to do this that is both efficient and tight?

Answer 1

Use this

public static IEnumerable<IEnumerable<T>> Batch<T>(IEnumerable<T> collection, 
                                                   int batchSize)
{
    List<T> nextbatch = new List<T>(batchSize);
    foreach (T item in collection)
    {
        nextbatch.Add(item);
        if (nextbatch.Count == batchSize)
        {
            yield return nextbatch;
            nextbatch = new List<T>(batchSize);
        }
    }
    if (nextbatch.Count > 0)
        yield return nextbatch;
}

and use this

var result = Batch("item1;item2;item3".Split(';'), 100);