1）Dispatcher
void ProgressChanged(object sender, DownloadProgressChangedEventArgs e)
{
this.Dispatcher.Invoke(DispatcherPriority.Normal, new System.Windows.Forms.MethodInvoker(delegate()
{
this.ProgressBar.Value = e.ProgressPercentage;
}));
}
2） DispatcherTimer
// Create a Timer with a Normal Priority
_timer = new DispatcherTimer();
// Set the Interval to 2 seconds
_timer.Interval = TimeSpan.FromMilliseconds(2000);
// Set the callback to just show the time ticking away
// NOTE: We are using a control so this has to run on
// the UI thread
_timer.Tick += new EventHandler(delegate(object s, EventArgs a)
{
statusText.Text = string.Format(
"Timer Ticked: {0}ms", Environment.TickCount);
});
// Start the timer
_timer.Start();
3）BackgroundWorker
BackgroundWorker
_backgroundWorker = new BackgroundWorker();
...
// Set up the Background Worker Events
_backgroundWorker.DoWork += _backgroundWorker_DoWork;
backgroundWorker.RunWorkerCompleted +=
_backgroundWorker_RunWorkerCompleted;
// Run the Background Worker
_backgroundWorker.RunWorkerAsync(5000);
...
// Worker Method
void _backgroundWorker_DoWork(object sender, DoWorkEventArgs e)
{
// Do something
}
// Completed Method
void _backgroundWorker_RunWorkerCompleted(
object sender,
RunWorkerCompletedEventArgs e)
{
if (e.Cancelled)
{
statusText.Text = "Cancelled";
}
else if (e.Error != null)
{
statusText.Text = "Exception Thrown";
}
else
{
statusText.Text = "Completed";
}
}