Azure功能ServiceBusTrigger在几毫秒内触发相同消息的多次，而不进行第一次完成

Question

为什么serviceBus会多次触发相同的消息？ 相同的触发器由服务总线上的相同消息执行：

[FunctionName("ProcessOrderFromServiceBusQueue")]
        public static void RunQueueMessages(
            [ServiceBusTrigger("orderqueue", Connection = "ServiceBusConnectionString")]
            string myQueueItem,
            int deliveryCount,
            DateTime enqueuedTimeUtc,
            string messageId,
            long sequenceNumber,
            TraceWriter log, ExecutionContext context)
        {
            log.Info($"C# ServiceBus Queue trigger function processed message: {myQueueItem}");            

            var config = new ConfigurationBuilder()
                                .SetBasePath(context.FunctionAppDirectory)
                                .AddJsonFile("local.settings.json", optional: true, reloadOnChange: true)
                                .AddEnvironmentVariables()
                                .Build();

            //var conn = config["ServiceBusConnectionString"];
            //var queueName = config["QueueName"];
            //var queueClient = new QueueClient(conn, queueName);
            //queueClient.CompleteAsync()
            log.Info($"Received Order: OrderId:{messageId} SequenceNumber:{sequenceNumber} Body:{myQueueItem}");


            // Deserialize the message body
            var order = JsonConvert.DeserializeObject<Order>(myQueueItem);

            // Process the order
            ProcessOrder(order, log, config);

            log.Info($"C# ServiceBus queue trigger function processed message: {messageId}");
        }

Answer 1

很可能函数体在消息处理过程中抛出异常。函数App中止其处理，消息返回队列并立即再次调度，再次失败等等。

最后，它达到Max Delivery Count并停在死信队列中。

你能检查一下我的假设吗？例如。同时打印deliveryCount，并检查DLQ中的内容。