Producer：消息的生产者，也就是创建消息的对象
Exchange：消息的接受者，也就是用来接收消息的对象，Exchange接收到消息后将消息按照规则发送到与他绑定的Queue中。下面我们来定义一个Producer与Exchange。
1.新建.netcore console项目，并引入RabbitMQ.Client的Nuget包
2.创建Exchange
using RabbitMQ.Client;namespace RabbitMQConsole{ ???class Program ???{ ???????static void Main(string[] args) ???????{ ???????????ConnectionFactory factory = new ConnectionFactory(); ???????????factory.HostName = "39.**.**.**"; ???????????factory.Port = 5672; ???????????factory.VirtualHost = "/"; ???????????factory.UserName = "root"; ???????????factory.Password = "root"; ???????????var exchange = "change2"; ???????????var route = "route2"; ???????????var queue = "queue2"; ???????????using (var connection = factory.CreateConnection()) ???????????{ ???????????????using (var channel = connection.CreateModel()) ???????????????{ ???????????????????channel.ExchangeDeclare(exchange, type:"direct", durable: true, autoDelete: false); ??//创建Exchange ???????????????????????????????????} ???????????} ???????} ???}}可以看到Echange的参数有：
type：可选项为，fanout，direct，topic，headers。区别如下：
fanout：发送到所有与当前Exchange绑定的Queue中
direct：发送到与消息的routeKey相同的Rueue中
topic：fanout的模糊版本
headers：发送到与消息的header属性相同的Queue中
durable：持久化
autoDelete：当最后一个绑定（队列或者exchange）被unbind之后，该exchange自动被删除。
运行程序，可以在可视化界面看到change2
接下来我们可以创建与change2绑定的queue
3.创建Queue
???????????????using (var channel = connection.CreateModel()) ???????????????{ ???????????????????channel.ExchangeDeclare(exchange, type: "direct", durable: true, autoDelete: false); ???????????????????channel.QueueDeclare(queue, durable: true, exclusive: false, autoDelete: false); ?#创建queue2 ???????????????????channel.QueueBind(queue, exchange, route); #将queue2绑定到exchange2 ???????????????}可以看到Echange的参数有：
durable：持久化
exclusive：如果为true，则queue只在channel存在时存在，channel关闭则queue消失
autoDelete：当最后一个绑定（队列或者exchange）被unbind之后，该exchange自动被删除。
去可视化界面看Queue
4.发送消息
???????????????using (var channel = connection.CreateModel()) ???????????????{ ???????????????????channel.ExchangeDeclare(exchange, type: "direct", durable: true, autoDelete: false); ???????????????????channel.QueueDeclare(queue, durable: true, exclusive: false, autoDelete: false); ???????????????????channel.QueueBind(queue, exchange, route); ???????????????????var props = channel.CreateBasicProperties(); ???????????????????props.Persistent = true; #持久化 ???????????????????channel.BasicPublish(exchange, route, true, props, Encoding.UTF8.GetBytes("hello rabbit")); ???????????????}5.消费消息
using RabbitMQ.Client;using System;using System.Text;namespace RabbitMQClient{ ???class Program ???{ ???????private static readonly ConnectionFactory rabbitMqFactory = new ConnectionFactory() ???????{ ???????????HostName = "39.**.**.**", ???????????Port = 5672, ???????????UserName = "root", ???????????Password = "root", ???????????VirtualHost = "/" ???????}; ???????static void Main(string[] args) ???????{ ???????????var exchange = "change2"; ???????????var route = "route2"; ???????????var queue = "queue2"; ???????????using (IConnection conn = rabbitMqFactory.CreateConnection()) ???????????using (IModel channel = conn.CreateModel()) ???????????{ ???????????????channel.ExchangeDeclare(exchange, "direct", durable: true, autoDelete: false); ???????????????channel.QueueDeclare(queue, durable: true, exclusive: false, autoDelete: false); ???????????????channel.QueueBind(queue, exchange, route); ???????????????while (true) ???????????????{ ???????????????????var message = channel.BasicGet(queue, true); ?#第二个参数说明自动释放消息，如为false需手动释放消息 ???????????????????if(message!=null) ???????????????????{ ???????????????????????var msgBody = Encoding.UTF8.GetString(message.Body); ???????????????????????Console.WriteLine(string.Format("***接收时间:{0}，消息内容：{1}", DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"), msgBody)); ???????????????????} ???????????????????System.Threading.Thread.Sleep(TimeSpan.FromSeconds(1)); ???????????????} ???????????} ???????} ???}}运行查看结果
查看可视化界面
6.手动释放消息
???????????????while (true) ???????????????{ ???????????????????var message = channel.BasicGet(queue, false);#设置为手动释放 ???????????????????if(message!=null) ???????????????????{ ???????????????????????var msgBody = Encoding.UTF8.GetString(message.Body); ???????????????????????Console.WriteLine(string.Format("***接收时间:{0}，消息内容：{1}", DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"), msgBody)); ???????????????????} ???????????????????channel.BasicAck(message.DeliveryTag, false); #手动释放 ???????????????????System.Threading.Thread.Sleep(TimeSpan.FromSeconds(1)); ???????????????}我们再发一条消息，然后开始消费，加个断点调试一下
查看一下Queue中消息状态
然后直接取消调试，不让程序走到释放的那一步，再查看一下消息状态
这么说来只要不走到 channel.BasicAck(message.DeliveryTag, false);这一行，消息就不会被释放掉，我们让程序直接走到这一行代码，查看一下消息的状态
如图已经被释放了
7.让失败的消息回到队列中
???????????????while (true) ???????????????{ ???????????????????var message = channel.BasicGet(queue, false); ???????????????????if(message!=null) ???????????????????{ ???????????????????????var msgBody = Encoding.UTF8.GetString(message.Body); ???????????????????????Console.WriteLine(string.Format("***接收时间:{0}，消息内容：{1}", DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"), msgBody)); ???????????????????????Console.WriteLine(message.DeliveryTag); #当前消息被处理的次序数 ???????????????????????if (1==1) ???????????????????????????channel.BasicReject(message.DeliveryTag, true); ???????????????????} ???????????????????????????????????????System.Threading.Thread.Sleep(TimeSpan.FromSeconds(1)); ???????????????}重新发送4条消息
开始消费
我们可以看到消息一直没有没消费，因为消息被处理之后又放到了队尾
8.监听消息
using (IConnection conn = rabbitMqFactory.CreateConnection()) ???????????using (IModel channel = conn.CreateModel()) ???????????{ ???????????????channel.ExchangeDeclare(exchange, "direct", durable: true, autoDelete: false); ???????????????channel.QueueDeclare(queue, durable: true, exclusive: false, autoDelete: false); ???????????????channel.QueueBind(queue, exchange, route); ???????????????channel.BasicQos(prefetchSize: 0, prefetchCount: 10, global: false); ?#一次接受10条消息，否则rabbit会把所有的消息一次性推到client，会增大client的负荷 ???????????????EventingBasicConsumer consumer = new EventingBasicConsumer(channel); ???????????????consumer.Received += (model, ea) => ???????????????{ ???????????????????Byte[] body = ea.Body; ???????????????????String message = Encoding.UTF8.GetString(body); ???????????????????Console.WriteLine( message+Thread.CurrentThread.ManagedThreadId); ???????????????????channel.BasicAck(deliveryTag: ea.DeliveryTag, multiple: false); ???????????????}; ???????????????channel.BasicConsume(queue: queue, autoAck: false, consumer: consumer); ???????????????Console.ReadLine(); ???????????}RabbitMQ与.net core(二)Producer与Exchange
原文地址：https://www.cnblogs.com/lonelyxmas/p/10237139.html