SilverlightShow: Tip: Asynchronous Silverlight - Execute on the UI thread Comments

RE: Tip: Asynchronous Silverlight - Execute on the UI thread

chaits — Mon, 10 Jan 2011 14:18:08 GMT

Thank you a lot!!!!

It really helped me

RE: Tip: Asynchronous Silverlight - Execute on the UI thread

murki — Sat, 06 Nov 2010 05:26:15 GMT

what about updating objects that are bound to the UI (implementing INotifyPropertyChanged)??

RE: Tip: Asynchronous Silverlight - Execute on the UI thread

Fruitcake — Sun, 22 Aug 2010 19:43:08 GMT

Awesome !!

Thanks for this sweet small example. Helped me.

RE: Tip: Asynchronous Silverlight - Execute on the UI thread

Doan Huynh — Fri, 30 Jul 2010 13:41:46 GMT

Thank you, it is useful

RE: Tip: Asynchronous Silverlight - Execute on the UI thread

Tom — Fri, 23 Apr 2010 14:48:19 GMT

Great post, Dispatcher.BeginInvoke worked perfectly for me!

RE: Tip: Asynchronous Silverlight - Execute on the UI thread

nz — Thu, 05 Nov 2009 00:31:20 GMT

Hi Dennis, I try your solution, for some reason it is not asynchronous to the UI

RE: Tip: Asynchronous Silverlight - Execute on the UI thread

pwr — Sun, 13 Sep 2009 05:46:30 GMT

This article's been translated into Russian for silverlight.su

RE: Tip: Asynchronous Silverlight - Execute on the UI thread

emil — Sun, 29 Jun 2008 15:26:51 GMT

Hi Dennis,

For parameterized call you can use ParameterizedThreadStart(void (object) target) instead of ThreadStart(void () target).

So instead of

Thread thread = new Thread( new ThreadStart( ... ) );

use

Thread thread = new Thread( new ParameterizedThreadStart( SetText ) );

where SetText takes one parameter:

private void SetText( object o )

Another way, my preferred, to achieve your goal is the following:

ThreadStart ts = delegate()

    DispatcherOperation op =

        Dispatcher.BeginInvoke(

            new Actionstring>( UpdateUI ),

            tbx,

            "custom text" );

};

So your final code would look like:

private void UpdateUI( TextBox tbx, string text )

    tbx.Text = text;

void btn_Click( object sender, RoutedEventArgs e )

    //field.SolveRecursively(0);

    foreach ( UIElement elem in lr1.Children )

        TextBox tbx = elem as TextBox;

        if ( tbx != null )

            ThreadStart ts = delegate()

                DispatcherOperation op =

                    Dispatcher.BeginInvoke(

                        new Actionstring>( UpdateUI ),

                        tbx,

                        "custom text" );

};

            Thread thread = new Thread( ts );

            thread.Start();

            Thread.Sleep( 10 );

Hope that helps!

RE: Tip: Asynchronous Silverlight - Execute on the UI thread

Dennis — Sun, 29 Jun 2008 08:25:18 GMT

Hi,

Do you also have an example on parametrized asynchronous calls?

I have tried this piece of code:

private delegate void UpdateUIDelegate(TextBox tbx, string text);

        private void SetText(TextBox tbx, string text)
        {
            UpdateUIDelegate action = new UpdateUIDelegate(UpdateUI);
            tbx.Dispatcher.BeginInvoke(action,tbx,text);
        }

        private void UpdateUI(TextBox tbx, string text)
        {
            tbx.Text = text;
        }

        void btn_Click(object sender, RoutedEventArgs e)
        {
            //field.SolveRecursively(0);
            foreach (UIElement elem in LayoutRoot.Children)
            {
                TextBox tbx= elem as TextBox;
                if (tbx != null)
                {
                    Thread thread = new Thread(new ThreadStart(SetText));
                    thread.Start();
                    Thread.Sleep(10);
                }
            }
        }

But I get "No overload for 'SetText' matches delegate 'System.Threading.ThreadStart' "