Question

Is there a synchronous wait function that won’t tie up the UI-thread in .NET WPF? Something like:

Sub OnClick(sender As Object, e As MouseEventArgs) Handles button1.Click
     Wait(2000) 
     'Ui still processes other events here
     MessageBox.Show("Is has been 2 seconds since you clicked the button!")
End Sub

Answer 1

You can use a DispatcherTimer for that sort of thing.

Edit: This might do as well…

private void Wait(double seconds)
{
    var frame = new DispatcherFrame();
    new Thread((ThreadStart)(() =>
        {
            Thread.Sleep(TimeSpan.FromSeconds(seconds));
            frame.Continue = false;
        })).Start();
    Dispatcher.PushFrame(frame);
}

(Dispatcher.PushFrame documentation.)

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Starting with .NET 4.5 you can use async event handlers and Task.Delay to get the same behaviour. To simply let the UI update during such a handler return Dispatcher.Yield.