旋钮在清空textbox时发生 "Invalid cross-thread access."

按钮在清空textbox时发生 "Invalid cross-thread access."
再做类似于QQ聊天窗口的时候，ApplicationBarIconButton点击后清空textbox的text值，而textbox的lostFocus事件设置为隐藏ApplicationBar，然后就出了这个问题， "Invalid cross-thread access."如果去掉textbox的lostFocus事件就不会出现异常，请问这是怎么回事
------解决方案--------------------
你调什么异步的调用了吗
------解决方案--------------------
Deployment.Current.Dispatcher.BeginInvoke(() =>
            {
             //to do
             }
              );

试试
------解决方案--------------------

引用:

Quote: 引用:

Deployment.Current.Dispatcher.BeginInvoke(() =>
            {
             //to do
             }
              );

试试

之前试过，没用

       public MainPage()
        {
            InitializeComponent();
            //  Windows.Networking.Connectivity.DataUsage;
            // Sample code to localize the ApplicationBar
            //BuildLocalizedApplicationBar();
            ab = (ApplicationBar)this.ApplicationBar;
        }
        private ApplicationBar ab;
        private void TextBox_LostFocus(object sender, RoutedEventArgs e)
        {
            ab.IsVisible = false;
        }

        private void TextBox_GotFocus(object sender, RoutedEventArgs e)
        {
            if (ab.IsVisible)
            {
                return;
            }
            ab.IsVisible = true;
        }

        private void appbarClear_Click(object sender, EventArgs e)
        {

            txt.Text = string.Empty;
        }
是这样么，我试了下，没你那问题啊