RabbitMQ 多线程 生产者 QueueDeclare

[wroger]

        static IModel model;
        public IModel RetrieveSomeSharedIModelInstance()
        {
            if (model == null)
            {
                var factory = new ConnectionFactory()
                {
                    HostName = "10.10.0.210",
                    UserName = "1",
                    Password = "1",
                    //Port = options.Value.RabbitPort,
                };
                IConnection _connection = factory.CreateConnection();
                model = _connection.CreateModel();
                model.QueueDeclare(queue: "Test",
                            durable: true,
                            exclusive: false,
                            autoDelete: false,
                            arguments: null);
            }
            return model;
        }
        public void SendMessage(string message)
        {
            try
            {
                IModel _channel = RetrieveSomeSharedIModelInstance();
                var properties = _channel.CreateBasicProperties();
                properties.DeliveryMode = 2;//数据模式：1不持久化，2持久化
                string msgJson = DataManage.ObjToJson.ObjectToJsonOfNewton(message);
                var body = System.Text.Encoding.UTF8.GetBytes(msgJson);
                lock (_channel)
                {
                    _channel.BasicPublish(exchange: "",
                                     routingKey: "Test",
                                     basicProperties: properties,
                                     body: body);
                }
            }
            catch (Exception e)
            {
                throw (e);
            }
        }

按照官方文档说法，应该避免多个线程同时使用IModel实例，在使用时加锁，那么这个锁只能加到BasicPublish上。上面的代码如果将QueueDeclare也放到锁内的话，即多线程同时声明队列，就会报异常： "Pipelining of requests forbidden" 。

声明队列只能单线程操作吗？加锁也不好使？

如果不放到 发送消息之前的话，怎么确保队列是存在的？