Silverlight 2 XAML Binding and Custom / Core Dependency Properties

Jason Kenny

jason kenny — Fri, 16 Jan 2009 17:43:40 GMT

Interesting, but usual =)

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Silverlight Cream for November 24, 2008 -- #437

Community Blogs — Mon, 24 Nov 2008 16:06:03 GMT

In this issue: Hannes Preishuber, David Justice, Dan Wahlin, Terence Tsang, and Chris Carper. From SilverlightCream

re: Silverlight 2 XAML Binding and Custom / Core Dependency Properties

Justin-Josef Angel — Mon, 24 Nov 2008 05:58:14 GMT

Hi David, I'll try to go easy on you because I like you personally :)

However, just for the sake of anyone reading this - what you said is completely wrong.

Still loving you David, but you missed this one big time.

The only thing that doesn't get called in this binding is the custom CLR property Radius Setter. However, you still get this nifty callback method which is the *only* thing you should use for custom DP change notifications.

Here's how you *should* have used the custom DP change notifications:

(pretty & readable version at http://pastebin.com/m62b2000b)

public class GlassButton : Button

{

public static readonly DependencyProperty _radiusProperty = DependencyProperty.Register("Radius", typeof(double),

typeof(GlassButton), new PropertyMetadata(RadiusCallBack));

private static void RadiusCallBack(DependencyObject d, DependencyPropertyChangedEventArgs e)

{

GlassButton sender = (GlassButton) d;

int value = Convert.ToInt32(e.NewValue);

if (value > 0)

sender.RenderTransform = new ScaleTransform { ScaleX = value / 26, ScaleY = value / 26 };

}

public double Radius

{

get { return (double)GetValue(_radiusProperty); }

set { this.SetValue(_radiusProperty, value); }

}

-- Justin

(remember, it's all from love :))

Silverlight 2 XAML Binding and Custom / Core Dependency Properties

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