一、添加Nuget引用

在Nuget中搜索DotNetCore.CAP.RabbitMQ并安装

二、在项目的StartUp中注入并配置服务

context.Services.AddCap(x =>
            {
                // 配置数据库链接
                //x.UseEntityFramework<OrderDbContext>();
                //配置数据库连接
                string connectionString = configuration["ConnectionStrings:Order"];
                x.UseMySql(connectionString);
                
                // 配置消息队列
                x.UseRabbitMQ(option =>
                {
                    option.HostName = configuration["CAPRabbitMQ:HostName"];
                    string portStr = configuration["CAPRabbitMQ:Port"];
                    if (!string.IsNullOrEmpty(portStr))
                    {
                        option.Port = Convert.ToInt32(portStr);
                    }
                    option.VirtualHost = configuration["CAPRabbitMQ:VirtualHost"];
                    option.UserName = configuration["CAPRabbitMQ:UserName"];
                    option.Password = configuration["CAPRabbitMQ:Password"];
                    if (!string.IsNullOrEmpty(configuration["CAPRabbitMQ:ExchangeName"]))
                    {
                        option.ExchangeName = configuration["CAPRabbitMQ:ExchangeName"];
                    }
                    option.ConnectionFactoryOptions = factory => factory.AutomaticRecoveryEnabled = true;
                });
                // 设置处理成功的数据在数据库中保存的时间（秒）,为了保证系统性能，数据会定期清理
                x.SucceedMessageExpiredAfter = Convert.ToInt32(configuration["CAPRabbitMQ:SucceedMessageExpiredAfter"]);
                // 重试次数
                x.FailedRetryCount = Convert.ToInt32(configuration["CAPRabbitMQ:FailedRetryCount"]);
                // 间隔时间 单位：秒
                x.FailedRetryInterval = Convert.ToInt32(configuration["CAPRabbitMQ:FailedRetryInterval"]);
                //发送消息失败后的回调
                x.FailedThresholdCallback = (failedInfo) =>
                {
                    //通知管理人员或其它逻辑 wms

                };
                x.Version = configuration["CAPRabbitMQ:Version"];
            }).AddSubscribeFilter<MyCapFilter>();

三、配置AppSetting文件

可以看到在上面配置Rabbitmq服务的时候为了方便修改配置，读取的是Appsetting中的CAPRabbitMQ节点。所以在配置文件中添加配置节点Appsetting。如下、

  "CAPRabbitMQ": {
    "HostName": "172.16.7.39", // 多个用逗号隔开（主从）
    "Port": 5672,
    "UserName": "dev",
    "Password": "dev_DKYao2021",
    "VirtualHost": "vH_bcs_dev",
    "ExchangeName": "e.bcs.dev.exchange", // 交换机.v3
    "FailedRetryCount": 5, //失败重试次数
    "FailedRetryInterval": 3, // 失败重试间隔时间 单位：秒
    "Version": "v1",
    "SucceedMessageExpiredAfter": 1440 // 定期清理成功的数据，单位分钟 
  },

四、接口定义

像平时定义接口一样定义在MQ中要响应的接口

 public interface IMqAppService 
    {
        void GetSubscribe(TodoDto<MqOrderInfoDto> orderObj);
	}

五、接口实现

这里以消费为例

/// <summary>
        /// 获取订单信息  
        /// </summary>
        /// <param name="orderObj"></param>
        [CapSubscribe(EventConstants.EVENT_ORDER_WAYBILL, Group = "q.topic.order.reviewed")]
        public void GetOrderSubscribe(TodoDto<MqOrderInfoDto> orderObj)
        {
            if (orderObj is {data: { }} && !string.IsNullOrEmpty(orderObj.data.OrderNo))
            {
                // 新版本拆单
                var stressful = _pendingOrderAppService.OrderTurnInvoiceNew(orderObj.data.OrderNo).Result;                _logger.LogInformation(stressful.message);
            }
            else
            {
                _logger.LogError("订单推送数据为空");
            }
        }