Question

I am breaking a list into chunks and processing it as below:

foreach (var partialist in breaklistinchunks(chunksize))
{
  try
   {
       do something
  }
catch
{
print error
}

}



public static class IEnumerableExtensions
    {
        public static IEnumerable<List<T>> BreakListinChunks<T>(this IEnumerable<T> sourceList, int chunkSize)
        {
            List<T> chunkReturn = new List<T>(chunkSize);
            foreach (var item in sourceList)
            {
                chunkReturn.Add(item);
                if (chunkReturn.Count == chunkSize)
                {
                    yield return chunkReturn;
                    chunkReturn = new List<T>(chunkSize);
                }
            }
            if (chunkReturn.Any())
            {
                yield return chunkReturn;
            }
        }
    }

If there is an error, I wish to run the chunk again. Is it possible to find the particular chunk number where we received the error and run that again ?
The batches have to be executed in sequential order .So if batch#2 generates an error, then I need to be able to run 2 again, if it fails again. I just need to get out of the loop for good .

Answer 1

I propose this answer based on your comment to Aaron’s answer.

The batches have to be executed in sequential order .So if 2 is a problem , then I need to be able to run 2 again, if it fails again. I just need to get out of the loop for good.

foreach (var partialist in breaklistinchunks(chunksize))
{
    int fails = 0;
    bool success = false;

    do
    {
        try
        {
            // do your action
            success = true; // should be on the last line before the 'catch'
        }
        catch
        {
            fails += 1;
            // do something about error before running again
        }
    }while (!success && fails < 2);

    // exit the iteration if not successful and fails is 2
    if (!success && fails >= 2)
        break;
}