c# - How to retrieve Dead Letter Queue count?

Question

Question

How do i get the dead letter queue length without receiving each message and counting how many message I received?

My Current Implementation

 public int GetDeadLetterQueueCount()
    {
        //Ref:http://stackoverflow.com/questions/22681954/how-do-you-access-the-dead-letter-sub-queue-on-an-azure-subscription

        MessagingFactory factory = MessagingFactory.CreateFromConnectionString(CloudConnectionString);

        QueueClient deadLetterClient = factory.CreateQueueClient(QueueClient.FormatDeadLetterPath(_QueueClient.Path), ReceiveMode.PeekLock);
        BrokeredMessage receivedDeadLetterMessage;

        List<string> lstDeadLetterQueue = new List<string>();

        // Ref: https://code.msdn.microsoft.com/Brokered-Messaging-Dead-22536dd8/sourcecode?fileId=123792&pathId=497121593
        // Log the dead-lettered messages that could not be processed:

        while ((receivedDeadLetterMessage = deadLetterClient.Receive(TimeSpan.FromSeconds(10))) != null)
        {
                lstDeadLetterQueue.Add(String.Format("DeadLettering Reason is \"{0}\" and Deadlettering error description is \"{1}\"",
                receivedDeadLetterMessage.Properties["DeadLetterReason"],
                receivedDeadLetterMessage.Properties["DeadLetterErrorDescription"]));
                var locktime = receivedDeadLetterMessage.LockedUntilUtc;
        }

        return lstDeadLetterQueue.Count;
    }

Problem with implementation

Because I am receiving each message in peek and block mode, the messages have a lock duration set. During this time i cannot receive or even see the messages again until this time period has timed out.

There must be an easier way of just getting the count without having to poll the queue?

I do not want to consume the messages either, i would just like the count of the total amount.

Answer 1

您可以使用具有MessageCountDetails属性的NamespaceManager的 GetQueue() 方法，该属性又具有 DeadLetterMessageCount 属性。就像是：

var namespaceManager = Microsoft.ServiceBus.NamespaceManager.CreateFromConnectionString("<CONN_STRING>");
var messageDetails = namespaceManager.GetQueue("<QUEUE_NAME>").MessageCountDetails;
var deadLetterCount = messageDetails.DeadLetterMessageCount;