从xamarin .netstandard中的Azure IotHub接收消息

Question

我正在使用Visual Studio 2019在.netStandard 2.0中开发xamarin应用程序，我从iothub接收数据时遇到问题，我能够将xamarin应用程序的数据发送到iot hub，但无法从azure iothub接收数据。

解放

1. Microsoft.Azure.Device（1.20.0）

2. Microsoft.Azure.Device.Client（1.24.0）

   private const string DeviceConnectionString = "HostName=[your hostname];DeviceId=[your DeviceId];SharedAccessKey=[your shared key]";
   public async Task Start()
   {
   try
    {
       DeviceClient deviceClient = 
       DeviceClient.CreateFromConnectionString(DeviceConnectionString, TransportType.http1);
       await SendEvent(deviceClient);
       await ReceiveCommands(deviceClient);
    }
   catch (Exception ex)
    {
       Debug.WriteLine("Error in sample: {0}", ex.Message);
    }
   }
   async Task SendEvent(DeviceClient deviceClient)
   {
   string dataBuffer;        
   dataBuffer = "Hello Iot";
   Message eventMessage = new Message(Encoding.UTF8.GetBytes(dataBuffer));
   await deviceClient.SendEventAsync(eventMessage);
   
   }
   async Task ReceiveCommands(DeviceClient deviceClient)
   {
   Message receivedMessage;
   string messageData;
   while (true)
   {
       receivedMessage = await deviceClient.ReceiveAsync();
       if (receivedMessage != null)
       {
           messageData = Encoding.ASCII.GetString(receivedMessage.GetBytes());
           txtblkMessages.Text = messageData + "\n" + txtblkMessages.Text;
           await deviceClient.CompleteAsync(receivedMessage);
       }
   
       await Task.Delay(TimeSpan.FromSeconds(1));
   }
   }