Azure ServiceBus上的SqlFilter主题订阅未过滤

Question

我有一个WinRT应用程序,我正在使用Windows Azure Toolkit for Windows 8.我有一个设置,我希望客户订阅忽略发布到ServiceBus主题的消息,如果他们是发起者或者消息比他们的订阅开始时更早.

在我的BrokeredMessage的属性中,我添加了2个项目来涵盖这些场景:

message.Properties["Timestamp"] = DateTime.UtcNow.ToFileTime();
message.Properties["OriginatorId"] = clientId.ToString();

clientId是一个Guid.

用户端看起来像这样:

// ti is a class that contains a Topic, Subscription and a bool as a cancel flag.

string FilterName = "NotMineNewOnly";

// Find or create the topic.
if (await Topic.ExistsAsync(DocumentId.ToString(), TokenProvider))
{
    ti.Topic = await Topic.GetAsync(DocumentId.ToString(), TokenProvider);
}
else
{
    ti.Topic = await Topic.CreateAsync(DocumentId.ToString(), TokenProvider);
}

// Find or create this client's subscription to the board.
if (await ti.Topic.Subscriptions.ExistsAsync(ClientSettings.Id.ToString()))
{
    ti.Subscription = await ti.Topic.Subscriptions.GetAsync(ClientSettings.Id.ToString());
}
else
{
    ti.Subscription = await ti.Topic.Subscriptions.AddAsync(ClientSettings.Id.ToString());
}

// Find or create the subscription filter.
if (!await ti.Subscription.Rules.ExistsAsync(FilterName))
{
    // Want to ignore messages generated by this client and ignore any that are older than Timestamp.
    await ti.Subscription.Rules.AddAsync(FilterName, sqlFilterExpression: string.Format("(OriginatorId != '{0}') AND (Timestamp > {1})", ClientSettings.Id, DateTime.UtcNow.ToFileTime()));
}

ti.CancelFlag = false;

Topics[boardId] = ti;

while (!ti.CancelFlag)
{
    BrokeredMessage message = await ti.Subscription.ReceiveAndDeleteAsync(TimeSpan.FromSeconds(30));

    if (!ti.CancelFlag && message != null)
    {
        // Everything gets here!  :(
    }

我找回了所有东西 - 所以我不确定我做错了什么.解决订阅过滤器问题的最简单方法是什么？

Answer 1

创建订阅时,默认情况下会获得"MatchAll"过滤器.在上面的代码中,您只是添加了过滤器,因此除了"MatchAll"过滤器之外,还会应用它,因此会收到所有消息.只需在创建订阅后删除$ Default过滤器,即可解决问题.