RabbitMQ Pub/Sub -订阅者无法接收消息

我使用示例代码实现使用"fanout"交换类型的发布/订阅。但是如下代码所示，订阅者没有显示已发布的"Hello Word"消息。

Publisher.cs

 var factory = new ConnectionFactory() { HostName = "localhost" };
        using (var connection = factory.CreateConnection())
        using (var channel = connection.CreateModel())
        {
            channel.ExchangeDeclare(exchange: "logs", type: "fanout");
            var message = GetMessage(args);
            var body = Encoding.UTF8.GetBytes(message);
            channel.BasicPublish(exchange: "logs",
                                 routingKey: "",
                                 basicProperties: null,
                                 body: body);
            Console.WriteLine(" [x] Sent {0}", message);
        }
        Console.WriteLine(" Press [enter] to exit.");
        Console.ReadLine();
    }
    private static string GetMessage(string[] args)
    {
        return ((args.Length > 0)
               ? string.Join(" ", args)
               : "info: Hello World!");
    }

Subscriber.cs

 var factory = new ConnectionFactory() { HostName = "localhost" };
        using (var connection = factory.CreateConnection())
        using (var channel = connection.CreateModel())
        {
            channel.ExchangeDeclare(exchange: "logs", type: "fanout");
            var queueName = channel.QueueDeclare().QueueName;
            channel.QueueBind(queue: queueName,
                              exchange: "logs",
                              routingKey: "");
            Console.WriteLine(" [*] Waiting for logs.");
            var consumer = new EventingBasicConsumer(channel);
            consumer.Received += (model, ea) =>
            {
                var body = ea.Body;
                var message = Encoding.UTF8.GetString(body);
                Console.WriteLine(" [x] {0}", message);
            };
            channel.BasicConsume(queue: queueName,
                                 noAck: true,
                                 consumer: consumer);
            Console.WriteLine(" Press [enter] to exit.");
            Console.ReadLine();
        }

代码Ref: https://www.rabbitmq.com/tutorials/tutorial-three-dotnet.html