windows环境安装：
https://www.cnblogs.com/ericli-ericli/p/5902270.html
.NET Core 使用RabbitMQ
https://www.cnblogs.com/stulzq/p/7551819.html

安装

"C:\Program Files\RabbitMQ Server\rabbitmq_server-3.7.9\sbin\rabbitmq-plugins.bat" enable rabbitmq_management

net stop RabbitMQ && net start RabbitMQ

创建用户，密码，绑定角色

查看已有用户及用户的角色：
rabbitmqctl.bat list_users

新增一个用户：
rabbitmqctl.bat add_user username password
示例：
rabbitmqctl.bat add_user tangsansan 123456

rabbitmqctl.bat set_user_tags username administrator

示例：
rabbitmqctl.bat set_user_tags tangsansan administrator

基本用法

引入：RabbitMQ.Client

消费者

           //创建连接工厂var factory = new ConnectionFactory(){UserName = "tangsansan",//用户名Password = "123456",//密码HostName = "localhost"//rabbitmq ip};//创建连接var connection = factory.CreateConnection();//创建通道var channel = connection.CreateModel();//定义一个队列channel.QueueDeclare("hello", false, false, false, null);Console.WriteLine("\nRabbitMQ连接成功，请输入消息，输入exit退出！");string input;do{input = Console.ReadLine();var sendBytes = Encoding.UTF8.GetBytes(input);//发布消息channel.BasicPublish("", "hello", null, sendBytes);} while (input.Trim().ToLower() != "exit");channel.Close();connection.Close();

生产者

 //创建连接工厂var factory = new ConnectionFactory(){UserName = "tangsansan",//用户名Password = "123456",//密码HostName = "localhost"//rabbitmq ip};//创建连接var connection = factory.CreateConnection();//创建通道var channel = connection.CreateModel();//定义一个队列channel.QueueDeclare("hello", false, false, false, null);Console.WriteLine("\nRabbitMQ连接成功，请输入消息，输入exit退出！");string input;do{input = Console.ReadLine();var sendBytes = Encoding.UTF8.GetBytes(input);//发布消息channel.BasicPublish("", "hello", null, sendBytes);} while (input.Trim().ToLower() != "exit");channel.Close();connection.Close();

启动了一个生产者，两个消费者，可以看见两个消费者都能收到消息，消息投递到哪个消费者是由RabbitMQ决定的。

RabbitMQ消费失败的处理

RabbitMQ采用消息应答机制，即消费者收到一个消息之后，需要发送一个应答，然后RabbitMQ才会将这个消息从队列中删除，如果消费者在消费过程中出现异常，断开连接切没有发送应答，那么RabbitMQ会将这个消息重新投递

//接收到消息事件
consumer.Received += (ch, ea) =>
{var message = Encoding.UTF8.GetString(ea.Body);Console.WriteLine($"收到消息： {message}");Console.WriteLine($"收到该消息[{ea.DeliveryTag}] 延迟10s发送回执");Thread.Sleep(10000);//确认该消息已被消费channel.BasicAck(ea.DeliveryTag, false);Console.WriteLine($"已发送回执[{ea.DeliveryTag}]");
};

使用RabbitMQ的Exchange

前面我们可以看到生产者将消息投递到Queue中，实际上这在RabbitMQ中这种事情永远都不会发生。实际的情况是，生产者将消息发送到Exchange（交换器），由Exchange将消息路由到一个或多个Queue中（或者丢弃）

Direct Exchange

            string exchangeName = "TestChange";string queueName = "hello";string routeKey = "helloRouteKey";//创建连接工厂var factory = new ConnectionFactory(){UserName = "tangsansan",//用户名Password = "123456",//密码HostName = "localhost"//rabbitmq ip};//创建连接var connection = factory.CreateConnection();//创建通道var channel = connection.CreateModel();//定义一个Direct类型交换机channel.ExchangeDeclare(exchangeName, ExchangeType.Direct, false, false, null);//定义一个队列channel.QueueDeclare(queueName, false, false, false, null);//将队列绑定到交换机channel.QueueBind(queueName, exchangeName, routeKey, null);Console.WriteLine($"\nRabbitMQ连接成功,Exchange：{exchangeName}，Queue：{queueName}，Route：{routeKey}，\n\n请输入消息，输入exit退出！");string input;do{input = Console.ReadLine();var sendBytes = Encoding.UTF8.GetBytes(input);//发布消息channel.BasicPublish(exchangeName, routeKey, null, sendBytes);} while (input.Trim().ToLower() != "exit");channel.Close();connection.Close();

Fanout Exchange

所有发送到Fanout Exchange的消息都会被转发到与该Exchange 绑定(Binding)的所有Queue上。

Fanout Exchange 不需要处理RouteKey 。只需要简单的将队列绑定到exchange 上。这样发送到exchange的消息都会被转发到与该交换机绑定的所有队列上。类似子网广播，每台子网内的主机都获得了一份复制的消息。

所以，Fanout Exchange 转发消息是最快的。

static void Main(string[] args){string exchangeName = "TestFanoutChange";string queueName1 = "hello1";string queueName2 = "hello";string routeKey = "";//创建连接工厂ConnectionFactory factory = new ConnectionFactory{UserName = "tangsansan",//用户名Password = "123456",//密码HostName = "localhost"//rabbitmq ip};//创建连接var connection = factory.CreateConnection();//创建通道var channel = connection.CreateModel();//定义一个Direct类型交换机channel.ExchangeDeclare(exchangeName, ExchangeType.Fanout, false, false, null);//定义队列1channel.QueueDeclare(queueName1, false, false, false, null);//定义队列2channel.QueueDeclare(queueName2, false, false, false, null);//将队列绑定到交换机channel.QueueBind(queueName1, exchangeName, routeKey, null);channel.QueueBind(queueName2, exchangeName, routeKey, null);//生成两个队列的消费者ConsumerGenerator(queueName1);ConsumerGenerator(queueName2);Console.WriteLine($"\nRabbitMQ连接成功，\n\n请输入消息，输入exit退出！");string input;do{input = Console.ReadLine();var sendBytes = Encoding.UTF8.GetBytes(input);//发布消息channel.BasicPublish(exchangeName, routeKey, null, sendBytes);} while (input.Trim().ToLower() != "exit");channel.Close();connection.Close();}/// <summary>/// 根据队列名称生成消费者/// </summary>/// <param name="queueName"></param>static void ConsumerGenerator(string queueName){//创建连接工厂ConnectionFactory factory = new ConnectionFactory{UserName = "tangsansan",//用户名Password = "123456",//密码HostName = "localhost"//rabbitmq ip};//创建连接var connection = factory.CreateConnection();//创建通道var channel = connection.CreateModel();//事件基本消费者EventingBasicConsumer consumer = new EventingBasicConsumer(channel);//接收到消息事件consumer.Received += (ch, ea) =>{var message = Encoding.UTF8.GetString(ea.Body);Console.WriteLine($"Queue:{queueName}收到消息： {message}");//确认该消息已被消费channel.BasicAck(ea.DeliveryTag, false);};//启动消费者 设置为手动应答消息channel.BasicConsume(queueName, false, consumer);Console.WriteLine($"Queue:{queueName}，消费者已启动");}

Topic Exchange

所有发送到Topic Exchange的消息被转发到能和Topic匹配的Queue上，

Exchange 将路由进行模糊匹配。可以使用通配符进行模糊匹配，符号“#”匹配一个或多个词，符号“”匹配不多不少一个词。因此“XiaoChen.#”能够匹配到“XiaoChen.pets.cat”，但是“XiaoChen.” 只会匹配到“XiaoChen.money”。

所以，Topic Exchange 使用非常灵活。

      static void Main(string[] args){string exchangeName = "TestTopicChange";string queueName = "hello";string routeKey = "TestRouteKey.*";//创建连接工厂ConnectionFactory factory = new ConnectionFactory{UserName = "tangsansan",//用户名Password = "123456",//密码HostName = "localhost"//rabbitmq ip};//创建连接var connection = factory.CreateConnection();//创建通道var channel = connection.CreateModel();//定义一个Direct类型交换机channel.ExchangeDeclare(exchangeName, ExchangeType.Topic, false, false, null);//定义队列1channel.QueueDeclare(queueName, false, false, false, null);//将队列绑定到交换机channel.QueueBind(queueName, exchangeName, routeKey, null);Console.WriteLine($"\nRabbitMQ连接成功，\n\n请输入消息，输入exit退出！");string input;do{input = Console.ReadLine();var sendBytes = Encoding.UTF8.GetBytes(input);//发布消息channel.BasicPublish(exchangeName, "TestRouteKey.one", null, sendBytes);} while (input.Trim().ToLower() != "exit");channel.Close();connection.Close();}

问题：

None of the specified endpoints were reachable

这个异常在创建连接时抛出（CreateConnection()），原因一般是ConnectionFactory参数设置不对，比如HostName、UserName、Password
未设置VirtualHost的权限
设置方法：RabbitmqWeb管理网站-->Admin