从Azure的主题接收邮件产生空，主题有未读邮件 [英] Receiving message from Azure Topic yields null, topic has unread messages

问题描述

昨天，我能够从我创建自己的Azure的服务总线主题的订阅反复读消息。然而，今天，而使用相同的code截至昨天，所有的消息都为空尽管订阅的邮件数远高于0。让我解释：

Yesterday I was able to repeatedly read messages from a subscription of an Azure Service Bus Topic that I created myself. Today, however, whilst using the same code as yesterday, all messages are null despite that the message count of the subscription is well above 0. Let me elaborate:

继MSDN网站有关如何指令
<一href=\"http://www.windowsazure.com/en-us/documentation/articles/service-bus-dotnet-how-to-use-topics-subscriptions/\"相对=nofollow>阅读订阅的消息，我用下面的读取订阅客户端的消息：

Following the instruction on the MSDN site concerning how to read messages from subscription , I'm using the following to read messages from a subscription client:

var tokenProvider = TokenProvider.CreateSharedSecretTokenProvider("MySubscriber","MyKey");
var serviceUri = ServiceBusEnvironment.CreateServiceUri("sb", "MyNamespace", string.Empty);
var messagingFactory = MessagingFactory.Create(serviceUri, tokenProvider);
var subscriptionClient = messagingFactory.CreateSubscriptionClient("MyTopicName", "MySubscriptionName", ReceiveMode.PeekLock);

var brokeredMessage = subscriptionClient.Receive();

今天，brokeredMessage变量总是空的，但你可以从下面的截图看到，有在申购几条消息。

Today, the brokeredMessage variable is always null, but as you can see from the following screenshot, there are several messages in the subscription.

那么，为什么brokeredMessage == NULL？

So why does brokeredMessage == null?

该主题的设置都在管理门户网站设置和有：默认消息的生存时间= 1个小时，出版没有设置前重复检测的历史= 10分钟，过滤消息，题目状态=启用，并且没有共享访问政策。

The settings of the topic have been set in the management portal and are: Default message time to live = 1 hour, duplicate detection history = 10 min, filter message before publishing not set, topic state = enabled, and no shared access policies.

同样，对于认购，该设置是：默认消息的生存时间= 10分钟，锁定时间为5秒，最大传递计数= 10，主题订阅状态=启用，并没有涉及移动邮件的复选框已检查。

Likewise for the subscription, the settings are: Default message time to live = 10 min, Lock duration = 5 sec, Maximum delivery count = 10, Topic subscription state = Enabled, and none of the checkboxes concerning moving messages have been checked.

我会为任何想法感谢。

推荐答案

我已经找到了解决问题的办法;简单地删除预订并重新添加它。然而，这是为什么我不能阅读的邮件。下面的<一个href=\"http://stackoverflow.com/questions/8665858/azure-servicebus-returns-null-on-client-receive?rq=1\">thread在计算器使我相信这消息是死的，字母的，尽管显示否则的屏幕截图。

I've found a solution to the problem; simply delete the subscription and re-add it. That is, however, why I couldn't read the messages. The following thread on stackoverflow leads me to believe that the messages were dead-lettered, despite the screenshot showing otherwise.

如果我找出原因的问题，我会更新这个答案。

If I figure out the reason for the problem, I will update this answer.

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