Format Providers namespace issue

[Julien]

Hello,

I'm having a problem implementing the HtmlDataProvider in my Silverlight project: Here's the error:

The type 'HtmlDataProvider' was not found because 'clr-namespace:Telerik.Windows.Documents.FormatProviders.Html;assembly=Telerik.Windows.Documents.FormatProviders.Html' is an unknown namespace. [Line: 52 Position: 147]

the way I use it:

<telerik:RadRichTextBox x:Name="RichTextBox">
                                <telerikDocumentsHtml:HtmlDataProvider x:Key="HtmlProvider2" RichTextBox="{Binding ElementName=RichTextBox}" Html="{Binding Body, Mode=TwoWay}" />
                                <telerik:RadDocument LayoutMode="Flow"  >
                                </telerik:RadDocument>
                            </telerik:RadRichTextBox>

My namespace definition:

xmlns:telerikDocumentsHtml="clr-namespace:Telerik.Windows.Documents.FormatProviders.Html;assembly=Telerik.Windows.Documents.FormatProviders.Html"

Thanks for any help :)

[Julien]

Hello,

I made some progress and don't have the error anymore. THough I have another one now:

Error 1 A value of type 'HtmlDataProvider' cannot be added to a collection or dictionary of type 'UIElementCollection'. C:\Sources\C2\C2E5\Main\Src\ITIL\ITIL.Views.Silverlight\Views\ManageNoteView.xaml 61 45 ITIL.Views.Silverlight

Any hints of why I can't do that?

 <Grid x:Name="LayoutRoot">
       
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <local:NoteRibbonBarView />
         <telerikHtml:HtmlFormatProvider x:Name="HtmlProvider" ></telerikHtml:HtmlFormatProvider>

[Iva Toteva]

Hi Julien,

Please refer to this article on data providers for the right way to declare Data Providers in XAML. Basically, they must be added in the visual tree and not embedded in the RadRichTextBox control itself. You also don't need to add tags for RadDocument, as a Document will be created for the RichTextBox either way by the data provider.
Data providers inherit from FrameworkElement in the versions of the controls starting from Q1 2011, so there shouldn't be a problem to add them in an UIElementCollection. If you are using an older version of the controls, however, this would not be possible.
I have also noticed that in the code snippet that you have declared an HtmlFormatProvider. That produces the error you have cited, as HtmlFormatProviders are not FrameworkElements and are meant to be used in code-behind for "manual" export and import of documents.
Please see below the revised version of your first code-snippet:

<telerik:RadRichTextBox x:Name="RichTextBox" />
<telerikDocumentsHtml:HtmlDataProvider RichTextBox="{Binding ElementName=RichTextBox}" Html="{Binding Body, Mode=TwoWay}" />

I hope this helps.

Kind regards,
Iva
the Telerik team

[Julien]

Thanks a lot, it does seem to work now! =)

[Viktor]

Hi Julien,
How did you fix your original problem "The type 'HtmlDataProvider' was not found because 'clr-namespace:Telerik.Windows.Documents.FormatProviders.Html;assembly=Telerik.Windows.Documents.FormatProviders.Html' is an unknown namespace"?

Thank you.

Viktor

[Iva Toteva]

Hello Viktor,

Could you check if you have added a reference to Telerik.Windows.Documents.FormatProviders.Html assembly? This seems the most probable reason for the behavior you are observing.
You can refer to this article for more information on the use of data providers.

Best wishes,
Iva Toteva
the Telerik team