NavigateUrl binding and formatting issue - wpf

Question

I have
<Hyperlink attachedProperty:HyperlinkExtensions.IsExternal="true">
<Hyperlink.NavigateUri>
<Binding Path="Name" StringFormat="http://anycoolsite.net/tag={0}" />
</Hyperlink.NavigateUri>
<TextBlock>
<TextBlock.Text>
<Binding Path="Title" StringFormat="http://anycoolsite.net/tag={0}" />
</TextBlock.Text>
</TextBlock>
</Hyperlink>
and an attached property for that
public class HyperlinkExtensions
{
public static bool GetIsExternal(DependencyObject obj)
{
return (bool)obj.GetValue(IsExternalProperty);
}
public static void SetIsExternal(DependencyObject obj, bool value)
{
obj.SetValue(IsExternalProperty, value);
}
public static readonly DependencyProperty IsExternalProperty =
DependencyProperty.RegisterAttached("IsExternal", typeof(bool), typeof(HyperlinkExtensions), new UIPropertyMetadata(false, OnIsExternalChanged));
private static void OnIsExternalChanged(object sender, DependencyPropertyChangedEventArgs args)
{
var hyperlink = sender as Hyperlink;
if ((bool)args.NewValue)
hyperlink.RequestNavigate += Hyperlink_RequestNavigate;
else
hyperlink.RequestNavigate -= Hyperlink_RequestNavigate;
}
private static void Hyperlink_RequestNavigate(object sender, System.Windows.Navigation.RequestNavigateEventArgs e)
{
Process.Start(new ProcessStartInfo(e.Uri.AbsoluteUri));
e.Handled = true;
}
}
When I try to get an url from e, I only have a bound Name part, which is in {0}.
How to get the formatted one (http://anycoolsite.net/anyboundname)?
For testblock text the binding and formatting works as expected

Answer 1

OK, changed my extension this way:
public class HyperlinkExtensions
{
public static string GetUrlFormat(DependencyObject obj)
{
return (string)obj.GetValue(UrlFormatProperty);
}
public static void SetUrlFormat(DependencyObject obj, string value)
{
obj.SetValue(UrlFormatProperty, value);
}
public static readonly DependencyProperty UrlFormatProperty =
DependencyProperty.RegisterAttached("UrlFormat", typeof(string), typeof(HyperlinkExtensions), new UIPropertyMetadata(string.Empty, OnUrlFormatChanged));
private static void OnUrlFormatChanged(object sender, DependencyPropertyChangedEventArgs args)
{
var hyperlink = sender as Hyperlink;
if (!string.IsNullOrEmpty((string) args.NewValue))
{
hyperlink.NavigateUri = new Uri(string.Format((string) args.NewValue, hyperlink.NavigateUri));
hyperlink.RequestNavigate -= Hyperlink_RequestNavigate;
hyperlink.RequestNavigate += Hyperlink_RequestNavigate;
}
else
{
hyperlink.RequestNavigate -= Hyperlink_RequestNavigate;
}
}
private static void Hyperlink_RequestNavigate(object sender, System.Windows.Navigation.RequestNavigateEventArgs e)
{
Process.Start(new ProcessStartInfo(e.Uri.AbsoluteUri));
e.Handled = true;
}
}
Usage:
<Hyperlink attachedProperty:HyperlinkExtensions.UrlFormat="https://anycoolsite.com/products/{0}" ToolTip="Click to open in browser">
<Hyperlink.NavigateUri>
<Binding Path="ProductName"/>
</Hyperlink.NavigateUri>
<TextBlock Text="{Binding Title}"/>
</Hyperlink>