如何在IoT Edge模块中读取Module twin？

Question

如何从设备双胞胎设置中获取设置到我的c＃/.net核心Azure IoT Edge模块中？

Answer 1

在官方tutorial中，您找到了一个很好的示例，说明如何应对模块孪生的“所需属性”更改：

await ioTHubModuleClient.SetDesiredPropertyUpdateCallbackAsync(OnDesiredPropertiesUpdate, null);

static Task OnDesiredPropertiesUpdate(TwinCollection desiredProperties, object userContext)
{
    try
    {
        Console.WriteLine("Desired property change:");
        Console.WriteLine(JsonConvert.SerializeObject(desiredProperties));

        if (desiredProperties["TemperatureThreshold"]!=null)
            temperatureThreshold = desiredProperties["TemperatureThreshold"];

    }
    catch (AggregateException ex)
    {
        foreach (Exception exception in ex.InnerExceptions)
        {
            Console.WriteLine();
            Console.WriteLine("Error when receiving desired property: {0}", exception);
        }
    }
    catch (Exception ex)
    {
        Console.WriteLine();
        Console.WriteLine("Error when receiving desired property: {0}", ex.Message);
    }
    return Task.CompletedTask;
}