c# - Azure 函数在使用设备客户端 SDK 发送 D2C 消息时引发错误

Question

我有一个 Even hub Triggered azure 函数，我需要从中向 IoT hub 发送 D2C 消息。

我已经从 NuGet 安装了 Microsoft.Azure.Devices.Client。但它在 deviceClient.SendEventAsync(iotmessage) 发送 D2C 消息时抛出以下错误。

Error: Unable to find assembly 'Validation, Version=2.2.0.0, Culture=neutral, PublicKeyToken=2fc06f0d701809a7'. Are you missing a private assembly file? Error occured - Could not load file or assembly 'Validation, Version=2.2.0.0, Culture=neutral, PublicKeyToken=2fc06f0d701809a7' or one of its dependencies. The system cannot find the file specified.

代码:

[FunctionName("TelemetryProcessor")]
        public static async Task Run([EventHubTrigger("telemetry", ConsumerGroup = "$Default", Connection = "TelemetryEventHubConnection")]string telemetryMessage, TraceWriter log)
        {
            try
            {
                var message = JsonConvert.DeserializeObject<IoTMessage>(telemetryMessage);  
                if (message.MessageType == MessageType.TLM)
                {
                    var device = GetiDeviceById(message.SenderId);
                    if (device != null)
                    {
                        using (var deviceClient = DeviceClient.Create("iothub.azure-devices.net",
                                  new DeviceAuthenticationWithRegistrySymmetricKey(device.Id, device.Key), TransportType.Mqtt))
                        {
                            message.MessageType = MessageType.TLM_HUB;
                            var iotmessage = new Message(Encoding.ASCII.GetBytes(message.ToString()));
                            await deviceClient.SendEventAsync(iotmessage);
                        }
                    }
                    else
                    {
                        log.Error($"Device Not Found");
                    }
                }
            }
            catch (Exception ex)
            {
                log.Error($"Error occured - {ex.Message}");
            }
        }

Answer 1

我遇到了完全相同的问题，这就是我如何让它工作的。

为函数编辑/创建 project.json 文件并包含特定版本的验证。我还发现我在使用 Json serializable 时遇到了问题，直到我也指定了早期版本的 Newtonsoft.Json。

{
  "frameworks": {
    "net46":{
      "dependencies": {
        "microsoft.azure.devices.client": "1.6.1",
        "Newtonsoft.Json": "9.0.1",
        "validation": "[2.2.8]"
      }
    }
  }
}