Hallo,
I have the following problem:
I have created a custom control (derived from Control) and a control template (in Generic.xaml).
My control class has a property: TargerUri
public Uri TargetUri
{
get { return (Uri)GetValue(TargetUriProperty); }
set { SetValue(TargetUriProperty, value); }
}
// Using a DependencyProperty as the backing store for TargetUri. This enables animation, styling, binding, etc...
public static readonly DependencyProperty TargetUriProperty =
DependencyProperty.Register("TargetUri", typeof(Uri), typeof(SearchResultGadget), new PropertyMetadata(new Uri("foo://example.com")) );
In the control template I want to reformat the Uri to a different format. Therefor I created a value converter class (derived from IValueConverter):
public class CClientStartPageUriBuilder : IValueConverter
{
#region IValueConverter Members
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
string strUri = String.Format("/CClientStartPage/{0}", ((Uri)value).ToString());
Uri myUri = new Uri(strUri.Replace('\\', '/'));
return myUri;
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
#endregion
}
In the control template I bind the NavigateUri property of a HyperlinkButton to the TargetUri of my control using template binding and the value converter:
<HyperlinkButton x:Name="xTitle"
VerticalAlignment="Top" Foreground="#FFFF8700"
HorizontalAlignment="Left"
DataContext="{TemplateBinding TargetUri}"
NavigateUri="{Binding Converter={StaticResource UriBuilder}}"
Content="{TemplateBinding Title}" FontFamily="Tahoma" FontSize="16" Margin="0,0,0,3">
<HyperlinkButton.Effect>
<DropShadowEffect Direction="255" ShadowDepth="0" BlurRadius="11"/>
</HyperlinkButton.Effect>
</HyperlinkButton>
This works fine in the compiled version, but Blend (version 3.0.1927.0) prevents me from editing the control template. The error is:
An exception was thrown.
Exception: Catastrophic failure (Exception from HRESULT: 0x8000FFFF (E_UNEXPECTED))
StackTrace
at MS.Internal.XcpImports.MethodEx(IntPtr prt, String name, CValue[] cvData)
at System.Windows.UIElement.UpdateLayout()
InnerException: None
If I remove the line
DataContext=
"{TemplateBinding TargetUri}"
the error in Blend is gone and I can edit the template (but of course the template bindig is broken now).
Any ideas? This is really ginig me a headache.
Is this a Blend issue, or am I doing something wrong?
Your feedback is very much appreciated!
I already changed the type of my TargetUri property to string (and in the value converter as well) but this doesn't seem to change anything.
Btw. I am working with Silverlight 3.
