Question

我正在创建一个Windows 8.1 Phone应用程序。 UI有一个按钮和一个TextBox（称为txtStatus）

基本上，当我点击用户界面中的某个按钮时，以下代码将启动（仅显示部分代码）：

 private async void btnStart_Click(object sender, RoutedEventArgs e)
{
    try
    {
        // Get the list of Microsoft Bands paired to the phone.
        IBandInfo[] pairedBands = await BandClientManager.Instance.GetBandsAsync();
        if (pairedBands.Length < 1)
        {
            txtStatus.Text = "This sample app requires a Microsoft Band paired to your device. Also make sure that you have the latest firmware installed on your Band, as provided by the latest Microsoft Health app.";
            return;
        }

        // Connect to Microsoft Band.

            using (IBandClient bandClient = await BandClientManager.Instance.ConnectAsync(pairedBands[0]))
            {
bandClient.SensorManager.HeartRate.ReadingChanged += HeartRate_ReadingChanged;
await bandClient.SensorManager.HeartRate.StartReadingsAsync();
// Receive Accelerometer data for a while, then stop the subscription.
await Task.Delay(TimeSpan.FromSeconds(50));
await bandClient.SensorManager.HeartRate.StopReadingsAsync();
}
}
catch (Exception ex)
{
}



private void HeartRate_ReadingChanged(object sender, Microsoft.Band.Sensors.BandSensorReadingEventArgs<Microsoft.Band.Sensors.IBandHeartRateReading> e)
        {
txtStatus.Text = string.Format("Current Heart Rate is: {0}", e.SensorReading.HeartRate.ToString());
        }

当我运行此代码时，它会在处理程序中的以下行barfs：

txtStatus.Text = string.Format("Current Heart Rate is: {0}", e.SensorReading.HeartRate.ToString());

异常消息如下：

该应用程序调用了一个为a编组的接口不同的线程。（HRESULT的例外情况：0x8001010E （RPC_E_WRONG_THREAD））

听起来像UI线程和传感器读取线程不同。关于如何为两者使用相同线程的任何建议。或者如何在两个线程之间传递数据？

感谢您的期待。

Answer 1

该事件是在后台线程上引发的。使用CoreDispatcher.RunAsync将其封送回UI线程：

private async void HeartRate_ReadingChanged(object sender, Microsoft.Band.Sensors.BandSensorReadingEventArgs<Microsoft.Band.Sensors.IBandHeartRateReading> e)
{
     await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, 
               () => 
               {
                   txtStatus.Text = string.Format("Current Heart Rate is: {0}", e.SensorReading.HeartRate.ToString())
               }).AsTask();
}

Band应用程序调用了一个为不同线程编组的接口

1 个答案: