azure – 在通用Windows应用程序中调用FetchAttributesAsync后,A

我正在制作一个小应用程序,应该列出我的Azure队列中的项目数.
当我在Console App中使用FetchAttributesAsync和ApproximateMessageCount时,在调用FetchAttributesAsync(或FetchAttributes)之后,我在ApproximateMessageCount中得到了预期的结果.

当我在通用Windows应用程序中使用相同内容时,在调用FetchAttributesAsync后,ApproximateMessageCount仍保持为null(FetchAttributes在那里不可用).

控制台代码：

CloudStorageAccount _account;

        if (CloudStorageAccount.TryParse(_connectionstring,out _account))
        {
            var queueClient = _account.CreateCloudQueueClient();

            Console.WriteLine(" {0}",_account.QueueEndpoint);
            Console.WriteLine(" ----------------------------------------------");

            var queues = (await queueClient.ListQueuesSegmentedAsync(null)).Results;

            foreach (CloudQueue q in queues)
            {
                await q.FetchAttributesAsync();
                Console.WriteLine($" {q.Name,-40} {q.ApproximateMessageCount,5}");
            }
        }

通用应用代码：

IEnumerable<CloudQueue> queues;
        CloudStorageAccount _account;
        CloudQueueClient queueClient;

        CloudStorageAccount.TryParse(connectionstring,out _account);
        queueClient = _account.CreateCloudQueueClient();

        queues = (await queueClient.ListQueuesSegmentedAsync(null)).Results;

        foreach (CloudQueue q in queues)
        {
            await q.FetchAttributesAsync();

            var count = q.ApproximateMessageCount;

            // count is always null here!!!
        }

我尝试过各种各样的替代方案,比如Wait()等等等等等.无论我尝试什么,ApproximateMessageCount都保持为null并且具有dertermination :-(.

我错过了什么吗？

public static string GetApproximateMessageCount(HttpResponseMessage response)
    {
        return response.Headers.GetHeaderSingleValueOrDefault(Constants.HeaderConstants.LeaseStatus);
    }

public static string GetApproximateMessageCount(HttpResponseMessage response)
    {
        return response.Headers.GetHeaderSingleValueOrDefault(Constants.HeaderConstants.ApproximateMessagesCount);
    }