Question

我正在尝试使用C＃天蓝色函数从队列中读取消息（通知而不是轮询）。

我目前正在使用控制台应用程序将消息推送到队列中，请参见下文。

似乎有两种不同的产品，一个是azure服务总线，另一个是存储帐户中的队列。以下代码使用后面的代码，我不确定如何读取队列的消息吗？

非常感谢，

代码示例

StorageCredentials creds = new StorageCredentials(accountname, accountkey);
        CloudStorageAccount account = new CloudStorageAccount(creds, useHttps: true);
        CloudQueueClient queueClient = account.CreateCloudQueueClient();
        CloudQueue queue = queueClient.GetQueueReference("test-queue");
        queue.CreateIfNotExists();
        while (true)
        {
            CloudQueueMessage message = new CloudQueueMessage(JsonConvert.SerializeObject("my message"));
            queue.AddMessage(message);
        }

更新

在评论和以下专家建议的链接之后，我尝试了以下代码示例将消息推送到Azure Service Bus（即存储帐户中没有队列）

namespace ConsoleApp1
{
    using System;
    using System.Text;
    using System.Threading.Tasks;
    using Microsoft.Azure.ServiceBus;

    class Program
    {
        const string ServiceBusConnectionString = "Endpoint=sb://xxx.servicebus.windows.net/;SharedAccessKeyName=xxx;SharedAccessKey=xxx";
        const string QueueName = "name_of_queue";
        static IQueueClient queueClient;

        public static async Task Main(string[] args)
        {
            const int numberOfMessages = 10;
            queueClient = new QueueClient(ServiceBusConnectionString, QueueName);

            await SendMessagesAsync(numberOfMessages);

            await queueClient.CloseAsync();
        }

        static async Task SendMessagesAsync(int numberOfMessagesToSend)
        {
            for (var i = 0; i < numberOfMessagesToSend; i++)
            {
                string messageBody = $"Message {i}";
                var message = new Message(Encoding.UTF8.GetBytes(messageBody));

                Console.WriteLine($"Sending message: {messageBody}");

                // Send the message to the queue
                try
                {
                    await queueClient.SendAsync(message);  // this line
                }
                catch (Exception ex)
                {
                    throw ex;
                }
            }
        }
    }
}

当我在控制台窗口上方运行代码时，什么也不做，没有错误消息，只是什么都没有。奇怪。在Azure服务总线概述中，活动消息计数为零。

我正在使用此示例项目，但是queueClient.SendAsync永远不会返回。我是否需要在权限中设置一些天蓝色的内容？

https://github.com/Azure/azure-service-bus

最终收到错误

连接尝试失败，因为被连接方未一段时间后正确响应或建立连接由于连接的主机未能响应而失败

我可以在门户网站服务总线屏幕上看到请求

Answer 1

这些是您想要的吗？

1。如果要从azure服务总线队列中获取消息：

using System;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.Azure.ServiceBus;

namespace ConsoleApp2
{
    class Program
    {
        const string ServiceBusConnectionString = "xxxxxx";
        const string QueueName = "xxx";
        static IQueueClient queueClient;
        public static async Task Main(string[] args)
        {
            queueClient = new QueueClient(ServiceBusConnectionString, QueueName);

            RegisterOnMessageHandlerAndReceiveMessages();

            Console.ReadKey();

            await queueClient.CloseAsync();
        }
        static void RegisterOnMessageHandlerAndReceiveMessages()
        {
            var messageHandlerOptions = new MessageHandlerOptions(ExceptionReceivedHandler)
            {
                MaxConcurrentCalls = 10,
                AutoComplete = false
            };
            queueClient.RegisterMessageHandler(ProcessMessagesAsync, messageHandlerOptions);
        }
        static async Task ProcessMessagesAsync(Message message, CancellationToken token)
        {
            Console.WriteLine($"Received message: SequenceNumber:{message.SystemProperties.SequenceNumber} Body:{Encoding.UTF8.GetString(message.Body)}");
            await queueClient.CompleteAsync(message.SystemProperties.LockToken);
        }
        static Task ExceptionReceivedHandler(ExceptionReceivedEventArgs exceptionReceivedEventArgs)
        {
            Console.WriteLine($"Message handler encountered an exception {exceptionReceivedEventArgs.Exception}.");
            var context = exceptionReceivedEventArgs.ExceptionReceivedContext;
            Console.WriteLine("Exception context for troubleshooting:");
            Console.WriteLine($"- Endpoint: {context.Endpoint}");
            Console.WriteLine($"- Entity Path: {context.EntityPath}");
            Console.WriteLine($"- Executing Action: {context.Action}");
            return Task.CompletedTask;
        }
    }
}

在从服务总线队列接收消息之前，我已将消息放入队列。结果是：

2。如果要从Azure存储队列中获取消息：

using System;
using Microsoft.Azure; 
using Microsoft.Azure.Storage;
using Microsoft.Azure.Storage.Queue;

namespace ReceiveMessageFromAzureStorageQueue
{
    class Program
    {
        static void Main(string[] args)
        {
            CloudStorageAccount storageAccount = CloudStorageAccount.Parse("xxxxxx");
            CloudQueueClient queueClient = storageAccount.CreateCloudQueueClient();
            CloudQueue queue = queueClient.GetQueueReference("xxx");
            CloudQueueMessage peekedMessage = queue.PeekMessage();
            queue.FetchAttributes();
            int? cachedMessageCount = queue.ApproximateMessageCount;
            Console.WriteLine("Number of messages in queue: " + cachedMessageCount);
            for(int i=0; i<cachedMessageCount; i++) {
                    System.Threading.Thread.Sleep(10);
                    CloudQueueMessage retrievedMessage = queue.GetMessage(TimeSpan.FromMilliseconds(10));
                    Console.WriteLine(retrievedMessage.AsString);
                    queue.DeleteMessage(retrievedMessage);
            }
            Console.WriteLine("Already Read.");
        }
    }
}

在接收到消息之前，仍将消息放入azure存储队列中。结果是：

如果您还有其他疑问，请告诉我。

如何从天蓝色服务总线上读取消息

1 个答案: