Question

我正在开发一个使用外部设备使用USB协议与电子板通信的应用程序。当我想显示在TextBlock内部通信期间获得的结果时，会出现错误消息

调用线程无法访问此对象，因为另一个线程拥有它

如何停止此帖子或在我的文本块中打印相应的信息？

这里使用的代码：

    /// ******************************************************************
    /// <summary>
    /// RX_Thread
    /// 
    /// Description: 
    /// Second thread which receives data from configured receive port
    /// (CANDemo_RxChannel)of XL interface.
    /// </summary>
    /// ******************************************************************
    #region EVENT THREAD (RX)
    public  void RX_Thread()
    {
        // object to be fill with received data
        XLClass.xl_event receivedEvent = new XLClass.xl_event();

        // result of XL driver func. calls
        XLClass.XLstatus xlStatus = XLClass.XLstatus.XL_SUCCESS;

        // WaitForSingleObject values
        WaitResults waitResult = new WaitResults();


        // note: this thread is destroyed by MAIN
        while (true)
        {
            // wait for hardware events
            waitResult = (WaitResults)WaitForSingleObject(CANDemo_RxChannel.eventHandle, 1000);

            // if event occured... 
            if (waitResult != WaitResults.WAIT_TIMEOUT)
            {
                // ...init xlStatus first
                xlStatus = XLClass.XLstatus.XL_SUCCESS;

                // afterwards: while hw queue is not empty...
                while (xlStatus != XLClass.XLstatus.XL_ERR_QUEUE_IS_EMPTY)
                {
                    // ...receivedata from hardware queue
                    xlStatus = CANDemo_RxChannel.xlReceive(ref receivedEvent);

                    //  if receiveing succeed...
                    if (xlStatus == XLClass.XLstatus.XL_SUCCESS)
                    {
                        // ...print rx data
                        string BigContained = CANDemo.XL_GetEventString(receivedEvent);
                        //GetInfo(BigContained);
                       // ((XLClass.xl_event)xlEventCollection.xlEvent[0]).tagData.can_Msg.id = 0x74D;
                        if (receivedEvent.tagData.can_Msg.id == 0x76D)
                        {
                            if (receivedEvent.tagData.can_Msg.data[0] == Convert.ToByte(2) && receivedEvent.tagData.can_Msg.data[1] == Convert.ToByte(80) && receivedEvent.tagData.can_Msg.data[2] == Convert.ToByte(250))
                            {
// i want to writ the data in my Texbloxk but i get error :
                                    txtframeContainer.Text = "Enter in diagnostic mode   SupplierSpecific --> Ok ";
                            }
                        }
                    }
                }
            }
            // no event occured
        }
    }
    #endregion
    /// ------------------------------------------------------------------

等待你的反馈......

Answer 1

你只能从你的ui线程更新ui，所以如果你更新一个ui对象，你必须获得ui线程并在该线程上调用更新：

if (Application.Current.Dispatcher.CheckAccess()) 
{ 
     txtframeContainer.Text = Result; 
} 
else 
{ 
    Application.Current.Dispatcher.Invoke((Action)(() =>
    {
        txtframeContainer.Text = "Enter in diagnostic mode   SupplierSpecific --> Ok ";
    }));
}

Answer 2

尝试在不是UI线程的线程上更新UI控件时会导致此错误。

看看这个问题：How to update the GUI from another thread in C#?它应该给你答案

与外部模块通信时线程未停止

2 个答案: