在 Visual Studio 2019 (C#) 中未找到 MqttMsgSubscribe.cs 错误

Question

我有一个奇怪的错误，代码如下：

MqttClient mClient = null;   
string[] topics = { "topic1", "topic1", "topic3" , "topic4"};

mClient = new MqttClient("127.0.0.1");
mClient.Connect(Guid.NewGuid().ToString());

if (!mClient.IsConnected) {
    Console.WriteLine("Error Connecting to message broker...");
    return;
}

 Client.MqttMsgPublishReceived += MClient_MqttMsgPublishReceived;
 byte[] qosLevels = { MqttMsgBase.QOS_LEVEL_EXACTLY_ONCE,
 MqttMsgBase.QOS_LEVEL_EXACTLY_ONCE, MqttMsgBase.QOS_LEVEL_EXACTLY_ONCE };
 mClient.Subscribe(topics, qosLevels);

有 4 个字符串({ "topic1", "topic1", "topic3" , "topic4"})我有MqttMsgSubscribe.cs not found 错误但是有 3 ({ "topic1", "topic1", "topic3"})应用程序运行良好，没有任何错误，有人可以帮助我吗？

Answer 1

这是因为您的topics数组有 4 个项目，但qosLevels只有 3 个 :) 这些数组中的项目计数应该完全相同。

所以，这样做：

byte[] qosLevels = { MqttMsgBase.QOS_LEVEL_EXACTLY_ONCE,
                     MqttMsgBase.QOS_LEVEL_EXACTLY_ONCE,
                     MqttMsgBase.QOS_LEVEL_EXACTLY_ONCE,
                     MqttMsgBase.QOS_LEVEL_EXACTLY_ONCE };