Using async await still freezes GUI

Question

I would like to handle long running operation in separate thread and return control back to GUI thread ASAP using async/await pattern as follows:

private         


        

Answer 1

You can use Task.Run or Task.Factory.StartNew to execute Test() or some long running and/or blocking operation on another thread:

private async void Button_Click(object sender, RoutedEventArgs e)
{
    await Task.Run(() => Test());
    txtResult.Text = "Done!";
}