ExtensionMethods.cs

public static IEnumerable<T> Unpage<T>(Func<int, int, IEnumerable<T>> func, int batchSize)
{
    int skip = 0;
    int count;
    do
    {
        count = 0;
        foreach (var a in func(skip, batchSize))
        {
            count++;
            yield return a;
        }
        skip += batchSize;
    } while (count == batchSize);
}