收到消息时未检索到 msmq AppSpecific

Question

我想使用 MSMQ 传输消息。当我发送消息时，我将一个枚举 (StudentMessageType) 作为 AppSpecific 传递，这样我就可以识别我应该在目的地做什么。但是当我尝试接收消息时，我无法访问 AppSpecific 属性并且出现此异常：

Property AppSpecific was not retrieved when receiving the message. Ensure that the PropertyFilter is set correctly.

我应该怎么做才能收到 AppSpecific？

发送

var requestQueue = new MessageQueue(@".\private$\req");
requestQueue.MessageReadPropertyFilter.AppSpecific = true;
requestQueue.Formatter = new BinaryMessageFormatter();
Message studentNameMessage = new Message(studentName, new BinaryMessageFormatter());
studentNameMessage.AppSpecific = (int) Student.StudentMessageType.AddStudent;
requestQueue.Send(studentNameMessage, MessageQueueTransactionType.Single);
requestQueue.Close();

收到

requestQueue = new MessageQueue(@".\private$\req");
requestQueue.Formatter = new BinaryMessageFormatter();
MessageQueueTransaction transaction = new MessageQueueTransaction();
    try
        {
        transaction.Begin();
                Message message = requestQueue.Receive(transaction);
                output = (string)message.Body;
                output += "\t" + ((Student.StudentMessageType) message.AppSpecific).ToString();
                transaction.Commit();
        }
    catch (Exception e)
        {
                Console.WriteLine(e);
                throw;
        }

Answer 1

天哪，我只是忘记了接收方法中的这一行：

requestQueue.MessageReadPropertyFilter.AppSpecific = true;

收到消息时未检索到 msmq AppSpecific

msmq AppSpecific was not retrieved when receiving the message

c#

msmq