更改可见性不适用于C＃windows phone 8

Question

我正在尝试在某些工作中显示progessbar，但可见性不会改变......

private void GestureListener_PinchCompleted(object sender, PinchGestureEventArgs e)
{
    progressBar.Visibility = System.Windows.Visibility.Visible;
    DoWork();//quite long (4-5 seconds)
    progressBar.Visibility = System.Windows.Visibility.Collapsed;
}

是否有resfreh方法或类似的东西？我做错了吗？

Answer 1

您正在UI线程中执行DoWork()，将其阻止4到5秒。这就是您无法看到进度条的原因。

考虑在单独的线程中调用DoWork：

private async void GestureListener_PinchCompleted(object sender, PinchGestureEventArgs e)
{
    progressBar.Visibility = System.Windows.Visibility.Visible;
    await Task.Run(()=> DoWork()); //quite long (4-5 seconds)
    progressBar.Visibility = System.Windows.Visibility.Collapsed;
}

Asynchronous Programming For Windows Phone 8