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 receivedstring 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 :" 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