Question

我遇到了从我在azure中设置的队列接收消息的问题。我以前使用相同的代码成功完成了这个，但现在我只是在尝试获取消息时得到null。当我在azure管理控制台中查看队列时，我清楚地看到该队列包含5条消息。

以下是代码：

ServiceBus SB = new ServiceBus();
Microsoft.ServiceBus.Messaging.BrokeredMessage message;
while (true)
{
    message = SB.ReceiveMessage("orders");
    if (message == null)
    {
        break;
    }
    Procurement.Order order = message.GetBody<Procurement.Order>();
    order.id = Guid.NewGuid().ToString();
    order.remindercount = 0;

    using (DbManager db = new DbManager())
    {
        if (db.SetSpCommand("CreateOrderHead",
            db.Parameter("@companyId", order.companyId),
            db.Parameter("@orderId", order.orderId),
            db.Parameter("@suppliercode", order.suppliercode),
            db.Parameter("@supplierorderId", order.supplierorderId),
            db.Parameter("@orderdate", order.orderdate),
            db.Parameter("@desireddate", order.desireddate),
            db.Parameter("@ordertext", order.ordertext),
            db.Parameter("@name", order.name),
            db.Parameter("@street", order.street),
            db.Parameter("@zip", order.zip),
            db.Parameter("@city", order.city),
            db.Parameter("@country", order.country),
            db.Parameter("@countrycode", order.countrycode),
            db.Parameter("@deliveryterms", order.deliveryterms),
            db.Parameter("@reference", order.reference),
            db.Parameter("@deliveryinstruction", order.deliveryinstruction),
            db.Parameter("@id", order.id),
            db.Parameter("@partycode", order.partyCode)
            ).ExecuteNonQuery() == 1)
        {
            message.Complete();
            message = null;
        }

        db.SetSpCommand("DeleteOrderRows",
            db.Parameter("@orderid", order.orderId),
            db.Parameter("@companyId", order.companyId)
            ).ExecuteNonQuery();

        foreach (Procurement.Orderrow r in order.Orderrows)
        {
            db.SetSpCommand("CreateOrderRow",
            db.Parameter("@companyId", r.companyId),
            db.Parameter("@orderId", r.orderId),
            db.Parameter("@orderrowId", r.orderrowId),
            db.Parameter("@itemId", r.itemId),
            db.Parameter("@itemdesc", r.itemdesc),
            db.Parameter("@orderqty", r.orderqty),
            db.Parameter("@desireddate", r.desireddate),
            db.Parameter("@rowtext", r.rowtext),
            db.Parameter("@supplieritemId", r.supplieritemId),
            db.Parameter("@unit", r.unit),
            db.Parameter("@id", order.id),
            db.Parameter("@unitprice", r.unitprice),
            db.Parameter("@rowprice", r.rowprice)
            ).ExecuteNonQuery();
        }
    }
}
Thread.Sleep(new TimeSpan(0, 1, 0));

这是ServiceBus类：

public class ServiceBus
{
    TokenProvider TokenProvider;
    MessagingFactory Factory;

    public ServiceBus()
    {
        TokenProvider = TokenProvider.CreateSharedSecretTokenProvider(GetIssuerName(), GetSecret());
        Factory = MessagingFactory.Create(
            GetURINameSpace(),
            TokenProvider
            );
    }

    public void SendMessage(string queue, BrokeredMessage message)
    {
        var client = Factory.CreateQueueClient(queue);
        client.Send(message);
    }

    public BrokeredMessage ReceiveMessage(string queue)
    {
        var client = Factory.CreateQueueClient(queue, ReceiveMode.ReceiveAndDelete);
        BrokeredMessage message = client.Receive();
        return message;
    }

    private static Uri GetURINameSpace()
    {
        return ServiceBusEnvironment.CreateServiceUri("sb", GetNamespace(), string.Empty);
    }

    private static string GetNamespace()
    {
        return "Namespace i have verified its the right one";
    }

    private static string GetIssuerName()
    {
        return "Issuer i have verified its the right one";
    }

    private static string GetSecret()
    {
        return "Key i have verified its the right one";
    }
}

我认为这应该是非常直接但我无法找出我做错了什么。它可能是一些很小的东西，我不知道...

无论如何，提前谢谢！

Answer 1

您在SubcriptionDescription.MessageCount中看到的那些BrokeredMessages不仅是常规消息，还包括$ DeadLetterQueue-sub队列中消息的计数!!!

使用此代码段检索该子队列中的所有邮件并打印出其详细信息。将[主题]和[订阅]重命名为您的实际内容：

MessagingFactory msgFactory = MessagingFactory.Create(_uri, _tokenProvider);
        MessageReceiver msgReceiver = msgFactory.CreateMessageReceiver("[topic]/subscriptions/[subscription]/$DeadLetterQueue", ReceiveMode.PeekLock);

        while (true)
        {
            BrokeredMessage msg = msgReceiver.Receive();

            if (msg != null)
            {
                Console.WriteLine("Deadlettered message.");

                Console.WriteLine("MessageId:                  {0}", msg.MessageId);
                Console.WriteLine("DeliveryCount:              {0}", msg.DeliveryCount);
                Console.WriteLine("EnqueuedTimeUtc:            {0}", msg.EnqueuedTimeUtc);
                Console.WriteLine("Size:                       {0} bytes", msg.Size);
                Console.WriteLine("DeadLetterReason:           {0}",
                    msg.Properties["DeadLetterReason"]);
                Console.WriteLine("DeadLetterErrorDescription: {0}",
                    msg.Properties["DeadLetterErrorDescription"]);
                Console.WriteLine();
                msg.Complete();
            }
        }

Answer 2

这个问题的解决方案是azure管理门户网站中的一个错误，它会在队列中显示错误的消息数量，或者消息以某种方式被标记为不会被读取。换句话说，它一直在工作，我只需要在队列中添加一些新消息。

Azure ServiceBus在Client.Receive（）上返回null

2 个答案: