Automatically adjust batch-size in ExecuteMultipleRequests

snippet.cs

public static IEnumerable<ExecuteMultipleResponse> RunMultipleRequestInSteps(ICrmConnection crmConnection, IEnumerable<OrganizationRequest> organizationRequestList, ExecuteMultipleRequest executeMultipleRequest, bool retryOnBatchSizeLimit = true)
{
    // Calculate totalElements, elementToProcess and steps
    var totalElements = organizationRequestList.Count();
    var steps = (totalElements <= MaxBatchRequestSize) ? 1 : Math.Ceiling((double) totalElements / MaxBatchRequestSize);

    var responseList = new List<ExecuteMultipleResponse>();
    for (int i = 0; i < steps; i++)
    {
        // Get current requests to process
        var requestsToProcess = organizationRequestList.Skip(i * MaxBatchRequestSize).Take(MaxBatchRequestSize).ToList();
        executeMultipleRequest.Requests.AddRange(requestsToProcess);

        try
        {
            var responseWithResults = (ExecuteMultipleResponse) crmConnection.ServiceProxy.Execute(executeMultipleRequest);
            responseList.Add(responseWithResults);
        }
        catch (FaultException<OrganizationServiceFault> exc)
        {
            // Check if the maximum batch size has been exceeded. The maximum batch size is only included in the fault if it
            // the input request collection count exceeds the maximum batch size.
            if (exc.Detail.ErrorDetails.Contains("MaxBatchSize"))
            {
                int maxBatchSize = Convert.ToInt32(exc.Detail.ErrorDetails["MaxBatchSize"]);
                if (maxBatchSize < executeMultipleRequest.Requests.Count)
                {
                    // Here you could reduce the size of your request collection and re-submit the ExecuteMultiple request
                    Console.WriteLine("The input request collection contains %0 requests, which exceeds the maximum allowed (%1)",
                        executeMultipleRequest.Requests.Count, maxBatchSize);

                    if (i == 0 && retryOnBatchSizeLimit)
                    {
                        // Fault was raised during first bulk request, so nothing has been done before => no sideeffects
                        // Lower number of bulked requests and retry
                        MaxBatchRequestSize = maxBatchSize;
                        RunMultipleRequestInSteps(crmConnection, organizationRequestList, executeMultipleRequest, false);
                    }
                    else
                    {
                        // At least one bulk request was successfully issued before or we did already retry 
                        throw;
                    }
                }
                else
                {
                    // Some unknown error related to maximum batch size
                    throw;
                }
            }
            else
            {
                // Some service fault we don't care about
                throw;
            }
        }
        finally
        {
            executeMultipleRequest.Requests.Clear();
        }
    }
    return responseList;
}