Can I send batch messages larger than 256 Kb to Azure Service Bus? http://diegogiacomelli.com.br/can-i-send-batch-messages-larger-than-256-kb-to-azure-service-bus

AzureServiceBus.cs

using Microsoft.ServiceBus.Messaging;
using Newtonsoft.Json;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace Sample
{
    public class AzureServiceBus<TMessage>
    {
        private readonly QueueClient _client;

        public AzureServiceBus(string connectionString, string queueName)
        {
            _client = QueueClient.CreateFromConnectionString(connectionString, queueName);
        }

        public async Task SendBatchAsync(IEnumerable<TMessage> messages)
        {
            var messagesToSend = messages
                                .Select(x => JsonConvert.SerializeObject(x))
                                .ToList();

            // There is a 256 KB limit per message sent on Azure Service Bus.
            // We will divide it into messages block lower or equal to 256 KB.
            // Maximum message size: 256 KB for Standard tier, 1 MB for Premium tier.
            // Maximum header size: 64 KB.
            // https://docs.microsoft.com/en-us/azure/service-bus-messaging/service-bus-quotas
            var maxBatchSize = 256000 - 64000;
            var pagedMessages = new List<BrokeredMessage>();

            while (messagesToSend.Count > 0)
            {
                var pageSize = 0L;

                foreach(var msg in messagesToSend)
                {
                    var brokeredMessage = new BrokeredMessage(msg);

                    if (pageSize + brokeredMessage.Size > maxBatchSize)
                        break;

                    pageSize += brokeredMessage.Size;
                    pagedMessages.Add(brokeredMessage);
                }

                try
                {
                    await _client.SendBatchAsync(pagedMessages);
                }
                catch(MessageSizeExceededException)
                {
                    // Due to system overhead, this limit is less than these values.
                    // https://docs.microsoft.com/en-us/azure/service-bus-messaging/service-bus-quotas
                    maxBatchSize -= 10000;
                    continue;
                }
                messagesToSend.RemoveRange(0, pagedMessages.Count);
                pagedMessages.Clear();
            }
        }    
    }
}