文档目录：

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CZGL.AliIoTClient 里设置了 7 个委托事件，在程序的不不同生命周期触发。

1）7个委托事件

        /// <summary>

        /// 服务器属性设置

        /// </summary>

        public PublishPropertyEventHandler PubPropertyEventHandler;

        /// <summary>

        /// 服务调用

        /// </summary>

        public PublishServiceEventHandler PubServiceEventHandler;

        /// <summary>

        /// 收到其它Topic时触发

        /// </summary>

        public PublishCommonEventHandler PubCommonEventHandler;

        /// <summary>

        /// 当 QOS=1或2时，收到订阅触发

        /// </summary>

        public uPLibrary.Networking.M2Mqtt.MqttClient.MqttMsgPublishedEventHandler PubedEventHandler;

        /// <summary>

        /// 向服务器发布 Topic 时

        /// </summary>

        public uPLibrary.Networking.M2Mqtt.MqttClient.MqttMsgSubscribedEventHandler SubedEventHandler;

        /// <summary>

        /// 向服务器发布 Topic 失败时

        /// </summary>

        public uPLibrary.Networking.M2Mqtt.MqttClient.MqttMsgUnsubscribedEventHandler UnSubedEventHandler;

        /// <summary>

        /// 断开连接时

        /// </summary>

        public uPLibrary.Networking.M2Mqtt.MqttClient.ConnectionClosedEventHandler ConnectionClosedEventHandler;

使用方法

    public static void TestEvent(object sender, MqttMsgPublishEventArgs e)

        {

            {

                // handle message received

                string topic = e.Topic;

                string message = Encoding.ASCII.GetString(e.Message);

                Console.WriteLine("- - - - - - - - - - ");

                Console.WriteLine("get topic message,Date: " + DateTime.Now.ToLongTimeString());

                Console.WriteLine("topic: " + topic);

                Console.WriteLine("get messgae :\n" + message);

        }

            client.PubPropertyEventHandler += TestEvent;

这里是旧版本的文档，可以参考一下。
https://www.cnblogs.com/whuanle/p/10786991.html