[IronPython] Silverlight DataBinding Not Working

Curt Hagenlocher curt at hagenlocher.org
Wed Dec 30 17:10:02 CET 2009

Silverlight doesn't support ICustomTypeDescriptor, which is how IronPython
objects interact with data binding on the desktop. For a workaround, see

I believe Silverlight 4 supports IDynamicMetaObjectProvider for data
binding, so the need for emitting your own CLR type goes away with that

On Wed, Dec 30, 2009 at 2:07 AM, Shyam Gopale <sgopale at gmail.com> wrote:

> Hi,
>    I am trying out some sample Silverlight code with IronPython and I found
> that the data binding does not work properly.
> The app.xaml is as below:
> <UserControl x:Class="System.Windows.Controls.UserControl"
>  xmlns="http://schemas.microsoft.com/client/2007"
>  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
>   <Grid x:Name="layout_root" Background="White">
>     <StackPanel>
>         <Slider x:Name="sliderFontSize" Margin="3" Minimum="1" Maximum="40"
> Value="10" />
>         <TextBlock x:Name="lblMessage" Text="Hello World" Margin="5"
> FontSize="{Binding ElementName=sliderFontSize,
> Path=Value,Mode=TwoWay}"></TextBlock>
>         <Button x:Name="cmdClickMe" Content="Click Me!"
> Margin="5"></Button>
>     </StackPanel>
>   </Grid>
> </UserControl>
> This XAML when used in a C# Silverlight app reflects the correct data
> binding behaviour but does not work when used with IronPython and Chiron.
> Mainly the font size of the text block is not updated.
> Does anyone have any idea about this?
> Thanks,
> Shyam
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