2
下面的程序基本上是来自C＃Rabbit MQ教程中的Receiver/Worker程序的程序：https://www.rabbitmq.com/tutorials/tutorial-two-dotnet.html（添加了计数器）。RabbitMQ BasicConsume和事件驱动的与Console.ReadLine（）相关的问题
有迹象表明，已经难倒我关于它的两三件事：
1）如果我注释掉“到Console.ReadLine（）”它消耗从队列中的消息，并显示：
Start Press [enter] to exit. My End - CountMessagesProcessed=0
我测试的前几次，我无法弄清楚发生了什么事。
2）该行从不在输出中显示：Console.WriteLine（“按[enter]退出。”）;.大概是因为它在“Console.ReadLine（）;”之前，但是为什么？ ReadLine事件和BasicConsumer之间的相互作用是什么？
3）MQ教程页面声称使用CNTL-C来停止“侦听器”进程，但是我发现只要按下回车键就可以很好地工作。
我以前用线程编写过MQSeries的监听器，我可能会更喜欢它，但只是想了解提供的基本教程。
using System;
using System.Collections.Generic;
using System.Text;
using System.Threading.Tasks;
using RabbitMQ.Client;
using RabbitMQ.Client.Events;
namespace RabbitMQReceiver
{
class Receive
{
public static void Main(string[] args)
{
var factory = new ConnectionFactory() { HostName = "localhost" };
var myQueuename = "MyQueueName1";
Console.WriteLine("My Start");
using (var connection = factory.CreateConnection())
using (var channel = connection.CreateModel())
{
channel.QueueDeclare(queue: myQueuename,
durable: false,
exclusive: false,
autoDelete: false,
arguments: null);
var consumer = new EventingBasicConsumer(channel);
int countMessagesProcessed = 0;
// this chunk of code is passed as parm/variable to BasicConsume Method below to process each item pulled of the Queue
consumer.Received += (model, ea) =>
{
var body = ea.Body;
var message = Encoding.UTF8.GetString(body);
countMessagesProcessed++;
Console.WriteLine(" [x] Received {0}", message);
}
channel.BasicConsume(queue: myQueuename,
noAck: true,
consumer: consumer);
Console.WriteLine(" Press [enter] to exit."); // this line never shows up in output
Console.ReadLine(); // if this line is commented out the message are consumed, but no Console.WriteLines appear at all.
Console.WriteLine("My End - CountMessagesProcessed=" + countMessagesProcessed);
}
}
}
}