1.Dispatcher.BeginInvoke
int ii = 0; new Thread(new ParameterizedThreadStart((i) => { while (true) { Thread.Sleep(400); Dispatcher.BeginInvoke(new Action(() => { ii += 1; btn2.Content = ii.ToString(); })); } })).Start();
2.动态回调中更新进度条(1中更新界面的方式已经不能直接奏效,需要调用DoEvent()方法才能及时更新界面信息)
private async void Button_Click(object sender, RoutedEventArgs e) { ServiceAgent.RestFullServiceRequestForFileDownload(new Uri("http://files.cnblogs.com/files/LittleFeiHu/ItcastWP7Simulator20110417.rar"), new DownloadProgressEventHandler((bytes) => { S.StudentName = bytes.ToString(); DoEvents(); Thread.Sleep(200); })); } private DispatcherOperationCallback exitFrameCallback = new DispatcherOperationCallback(ExitFrame); public void DoEvents() { DispatcherFrame nestedFrame = new DispatcherFrame(); DispatcherOperation exitOperation = Dispatcher.CurrentDispatcher.BeginInvoke(DispatcherPriority.Background, exitFrameCallback, nestedFrame); Dispatcher.PushFrame(nestedFrame); if (exitOperation.Status != DispatcherOperationStatus.Completed) { exitOperation.Abort(); } } private static Object ExitFrame(Object state) { DispatcherFrame frame = state as DispatcherFrame; frame.Continue = false; return null; }
时间: 2024-10-09 17:20:08