Question

我有以下代码连接到ActiveMQ服务器。连接工作，消费者在AMQ Web界面上可见，队列中有消息但OnMessage没有执行。

我尝试移动启动电话，但这并没有帮助。 TestConnection显示客户端ID＆amp;开始了：真的

队列中的消息数量逐渐减少，根据网络界面，我的消费者正在这样做。

web interface showing dequeues

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using Apache.NMS;

namespace MQLed
{
    class amqclientns
    {
        public String UriString = "activemq:tcp://hostname:61616";
        public string UserName = "";
        public string Password = "";
        private IConnection connection;
        private ISession session;
        private IDestination destination;
        private IMessageConsumer consumer;

        public ILogger Logger = null;

        public void TestLog(string Message) 
        {
            if (Logger != null) Logger.WriteLine(Message);
        }

        public void Connect()
        {
            try
            {
                IConnectionFactory factory = new NMSConnectionFactory(new Uri(UriString));
                connection = factory.CreateConnection(UserName, Password);
                connection.ExceptionListener += new ExceptionListener(OnException);
                session = connection.CreateSession();
                destination = session.GetDestination("queue://" + "mqled");
                consumer = session.CreateConsumer(destination);
                // connection.Start();
                consumer.Listener += new MessageListener(OnMessage);
                connection.Start();

                // OnMessage(consumer.ReceiveNoWait());
                if (Logger != null) Logger.WriteLine("Listening on " + destination.ToString());
            }
            catch (Exception ex)
            {
                if (Logger != null) Logger.WriteLine(ex.Message);
            }
        }

        public void TestConnection()
        {
            if (Logger != null) {
                Logger.WriteLine("TestConnection");
                Logger.WriteLine("Client id: " + connection.ClientId);
                Logger.WriteLine("Connection started: " + connection.IsStarted);
                Logger.WriteLine("Connection metadata: " + connection.MetaData);

                Logger.WriteLine("Consumer: " + consumer.ToString());
            }

        }

        public void Disconnect()
        {
            connection.Close();
        }

        public void OnException(Exception e)
        {
            Logger.Log(e.Message, "Exception");
        }

        public void OnMessage(IMessage message)
        {
            Logger.WriteLine("OnMessage " + (message != null).ToString());
            try
            {
                if (Logger != null) Logger.WriteLine("Message received");
                ITextMessage msg = (ITextMessage)message;
                message.Acknowledge();
                if (Logger != null) Logger.WriteLine(msg.Text);
            }
            catch (Exception ex)
            {
                if (Logger != null) Logger.WriteLine(ex.Message);
            }
        }
    }
}

Answer 1

我在这里回答我自己的问题，以供将来参考并帮助其他犯同样错误的人。感谢Tim Bish指出我正确的方向。

此处显示的代码没有任何问题，问题是OnMethod在另一个线程中执行，而不是显示日志记录信息的WinForms控件。由于异常应该由同一机制显示，所以没有任何错误可见。

可以在https://stackoverflow.com/a/925067/1817610

找到跨线程操作的解决方案

C＃Apache.NMS MessageListener OnMessage未触发

1 个答案: