c# - EasynetQ总线。订阅未触发-抛出“messageType不能为null”

我可以使用以下代码成功发布消息：

        using (IAdvancedBus bus = RabbitHutch.CreateBus("host=192.168.153.128:5672;username=user;password=pass").Advanced)
        {
            IExchange exchange = bus.ExchangeDeclare("milk.api", ExchangeType.Topic);
            IQueue queue = bus.QueueDeclare("milkorderqueue");
            IBinding binding = bus.Bind(exchange, queue, "#");
            bus.Publish<MilkOrderRequest>(exchange, "#", true, new Message<MilkOrderRequest>(milkOrder));
        }
        return new HttpResponseMessage(System.Net.HttpStatusCode.OK);

当我的订户尝试提取消息时，EasyNetQ_Default_Error_Queue队列增加。这是侦听器的代码：

        IBus bus = RabbitHutch.CreateBus(@"host=192.168.153.128:5672;username=user;password=pass");
        bus.Subscribe<MilkOrderRequest>("my_subscription_id", message =>
        {
            Console.WriteLine($"Order recieved: {message.Milk}.");
        }, config =>
        {
            config.WithQueueName("milkorderqueue");
        });

我也尝试了以下失败的方法：

        IAdvancedBus bus = RabbitHutch.CreateBus(@"host=192.168.153.128:5672;username=user;password=pass").Advanced;
        IExchange exchange = bus.ExchangeDeclare("milkshop.subscriber", ExchangeType.Topic);
        IQueue queue = bus.QueueDeclare("milkorderqueue");
        bus.Bind(exchange, queue, "#");
        bus.Consume<MilkOrderRequest>(queue, (message, info) =>
        {
            Console.WriteLine($"Order recieved: {message.Body.Milk}.");
        });

我无法在Google上找到有关该异常的答案：


  messageType不能为null


这是完整的消息：

{
   "RoutingKey":"#",
   "Exchange":"milk.api",
   "Queue":"milkorderqueue",
   "Exception":"System.AggregateException: One or more errors occurred. (messageType must not be null\r\nParameter name: messageType) ---> System.ArgumentNullException: messageType must not be null\r\nParameter name: messageType\r\n   at EasyNetQ.Preconditions.CheckNotNull[T](T value, String name, String message)\r\n   at EasyNetQ.Preconditions.CheckNotNull[T](T value, String name)\r\n   at EasyNetQ.MessageFactory.CreateInstance(Type messageType, Object body, MessageProperties properties)\r\n   at EasyNetQ.RabbitAdvancedBus.<>c__DisplayClass17_0.<Consume>b__0(Byte[] body, MessageProperties properties, MessageReceivedInfo messageReceivedInfo)\r\n   at EasyNetQ.Consumer.HandlerRunner.InvokeUserMessageHandler(ConsumerExecutionContext context)\r\n   --- End of inner exception stack trace ---\r\n---> (Inner Exception #0) System.ArgumentNullException: messageType must not be null\r\nParameter name: messageType\r\n   at EasyNetQ.Preconditions.CheckNotNull[T](T value, String name, String message)\r\n   at EasyNetQ.Preconditions.CheckNotNull[T](T value, String name)\r\n   at EasyNetQ.MessageFactory.CreateInstance(Type messageType, Object body, MessageProperties properties)\r\n   at EasyNetQ.RabbitAdvancedBus.<>c__DisplayClass17_0.<Consume>b__0(Byte[] body, MessageProperties properties, MessageReceivedInfo messageReceivedInfo)\r\n   at EasyNetQ.Consumer.HandlerRunner.InvokeUserMessageHandler(ConsumerExecutionContext context)<---\r\n",
   "Message":"{\"Milk\":\"semi-skimmed\"}",
   "DateTime":"2018-06-01T11:01:11.645241Z",
   "BasicProperties":{
      "ContentType":null,
      "ContentEncoding":null,
      "Headers":{

      },
      "DeliveryMode":0,
      "Priority":0,
      "CorrelationId":"fe1561c1-4c7c-4489-857e-b664f27a5e5f",
      "ReplyTo":null,
      "Expiration":null,
      "MessageId":null,
      "Timestamp":0,
      "Type":"Milkshop.Common.MilkOrderRequest:Milkshop.Common",
      "UserId":null,
      "AppId":null,
      "ClusterId":null,
      "ContentTypePresent":false,
      "ContentEncodingPresent":false,
      "HeadersPresent":true,
      "DeliveryModePresent":false,
      "PriorityPresent":false,
      "CorrelationIdPresent":true,
      "ReplyToPresent":false,
      "ExpirationPresent":false,
      "MessageIdPresent":false,
      "TimestampPresent":false,
      "TypePresent":true,
      "UserIdPresent":false,
      "AppIdPresent":false,
      "ClusterIdPresent":false
   }
}

我在.Net Core应用程序上使用EasynetQ版本3.0.0

最佳答案

发现错误。我的API项目和控制台应用程序使用的是EasynetQ nuget软件包的不同版本。一个是2.33，另一个是3.0.0。