无法从 Azure 获取队列长度/消息计数

Question

I have a Use Case where I need to queue a select number of messages when the current queue length drops below a specified value. Since I'm running in Azure, I'm trying to use the RetrieveApproximateMessageCount() method to get the current message count. Everytime I call this I get an exception stating StorageClientException: The specified queue does not exist. . Here is a review of what I've done:

1. Created the queue in the portal and have successfully queued messages to it.

2. Created the storage account in the portal and it is in the Created/Online state

3. Coded the query as follows ( using http and https options ):

    var storageAccount = new CloudStorageAccount( new StorageCredentialsAccountAndKey(_messagingConfiguration.StorageName.ToLower(), _messagingConfiguration.StorageKey), false); var queueClient = storageAccount.CreateCloudQueueClient(); var queue = queueClient.GetQueueReference(queueName.ToLower()); int messageCount; try { messageCount = queue.RetrieveApproximateMessageCount(); } catch (Exception) { //Booom.?:.. in every case } // ApproximateMessageCount is always null messageCount = queue;ApproximateMessageCount == null ? 0 : queue.ApproximateMessageCount.Value;

4. I've confirmed the name is cased correctly with not special characters, numbers, or spaces and the resulting queue Url appears as though its correct formed based on the API documentations ( eg http://myaccount.queue.core.windows.net/myqueue )

Can anyone help shed some light on what I'm doing wrong.

---

EDIT

I've confirmed that using the MessageFactory I can create a QueueClient and then enqueue/dequeue messages successfully. When I use the CloudStorageAccount the queue is never present so the counts and GetMessage routines never work. I am guessing these are not the same thing??? Assuming, I'm correct, what I need is to measure the length of the Service Bus Queue. Is that possible?

Answer 1

RetrieveApproximateMessageCount() has been deprecated

if you want to use ApproximateMessageCount to get result try this

CloudQueue q = queueClient.GetQueueReference(QUEUE_NAME);
q.FetchAttributes();
qCnt = q.ApproximateMessageCount;

Answer 2

The CloudQueue method has been deprecated (along with the v11 SDK).

The following snippet is the current replacement (from the Azure Docs )

//-----------------------------------------------------
// Get the approximate number of messages in the queue
//-----------------------------------------------------
public void GetQueueLength(string queueName)
{
    // Get the connection string from app settings
    string connectionString = ConfigurationManager.AppSettings["StorageConnectionString"];

    // Instantiate a QueueClient which will be used to manipulate the queue
    QueueClient queueClient = new QueueClient(connectionString, queueName);

    if (queueClient.Exists())
    {
        QueueProperties properties = queueClient.GetProperties();

        // Retrieve the cached approximate message count.
        int cachedMessagesCount = properties.ApproximateMessagesCount;

        // Display number of messages.
        Console.WriteLine($"Number of messages in queue: {cachedMessagesCount}");
    }
}

https://learn.microsoft.com/en-us/azure/storage/queues/storage-dotnet-how-to-use-queues?tabs=dotnet#get-the-queue-length