如何读取 IoT Edge 模块中的模块孪生？

Question

如何从 设备孪生设置 中获取设置到我的 c# /.net 核心 Azure IoT Edge 模块中？

Answer 1

您在官方 tutorial:

中找到了一个很好的示例，说明如何对模块孪生的所需 属性 更改做出反应

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;
}