开发Azure函数版本2时,如何在local.settings.json中配置“ConsumerGroup”

我有下面的代码来捕获所有到达的消息 IoT Hub

    [FunctionName("device-message--funcapp-v2")]
    public static void Run([IoTHubTrigger("testhub", 
                       Connection = "IoTHubEventEndPoint", 
                       ConsumerGroup = "ActualConsumerGroup")]EventData message, 
        ILogger log)
    {
        log.LogInformation($"C# IoT Hub trigger:
       {Encoding.UTF8.GetString(message.Body.Array)}");     
    }

这可以正常工作,但现在我不想硬编码 ConsumerGroup . 所以我在下面添加了configuraiton条目 local.settings.json

   {
     "IsEncrypted": false,
     "Values": {
          "AzureWebJobsStorage": "",
          "FUNCTIONS_WORKER_RUNTIME": "dotnet",
          "EventHub": "",
          "CosmosDb": "",
         "ConfigurationConsumerGroup": "ActualConsumerGroup"
          }
        }

并将代码更改如下

       [FunctionName("device-message--funcapp-v2")]
    public static void Run([IoTHubTrigger("testhub", 
        Connection = "IoTHubEventEndPoint", 
        ConsumerGroup = "ConfigurationConsumerGroup")]EventData message, 
        ILogger log)

但它失败了。

[1/18/2019 9:47:11 am]microsoft.azure.eventhubs:找不到消息实体“iothub-ns-testhub-945897-3A6F492CC4:eventhub:lctesthub~8191 configurationConsumerGroup”。