How can I delete a hyperlink in a Silverlight RichTextBox? - silverlight

Question

I have a RichTextBox that the user can edit to create a hyperlink (in my case to another page with the document rather than an external URL). Having successfully created the link I now need to be able to remove it.
I have code that identifies that I've got a hyperlink in the current selection:
TextSelection linkText = richTextBox.Selection;
if (linkText != null && !string.IsNullOrWhiteSpace(linkText.Text))
{
XElement root = XElement.Parse(linkText.Xaml);
XNamespace ns = "http://schemas.microsoft.com/winfx/2006/xaml/presentation";
XElement linkElement = root.Element(ns + "Paragraph").Element(ns + "Hyperlink");
if (linkElement != null)
{
// Get here if have a Hyperlink. How do I remove or update?
}
}
However, I'm now stuck on the bit that goes inside the if test. How do I find the hyperlink so I can remove it completely?
My code for setting up the hyperlink is:
TextSelection linkText = richTextBox.Selection;
var hyperlink = new Hyperlink();
hyperlink.Inlines.Add(linkText.Text);
if (!String.IsNullOrEmpty(selectedTopic)) // A string holding the link target
{
// Setup hyperlink here
}
linkText.Insert(hyperlink);
I've managed to work out how to update the hyperlink:
foreach (var block in richTextBox.Blocks)
{
Paragraph p = block as Paragraph;
foreach (var inline in p.Inlines)
{
var hyperlink = inline as Hyperlink;
if (hyperlink != null && hyperlink.NavigateUri.AbsoluteUri.Contains(currentLink))
{
hyperlink.NavigateUri = new Uri(newLink);
}
}
}
I could use the same approach to delete the hyperlink, but how do I convert the Hyperlink to a normal Inline?

Answer 1

Looks like you are getting close you just need to hold a reference to the link then use Remove. Something like the following (I like to use Linq to make things a little more succinct):-
foreach (var p in richTextBox.Blocks.OfType<Paragraph>())
{
var hyperlink = p.Inlines.OfType<HyperLink>()
.FirstOrDefault(hl => hl.NavigateUri.AbsoluteUri.Contains(currentLink));
if (hyperlink != null)
{
p.Inlines.Remove(hyperlink);
break;
}
}
Edit: Want to leave the content of hyperlink in place? (i.e., just remove the wrapping hyperlink),
foreach (var p in richTextBox.Blocks.OfType<Paragraph>())
{
var hyperlink = p.Inlines.OfType<HyperLink>()
.FirstOrDefault(hl => hl.NavigateUri.AbsoluteUri.Contains(currentLink));
if (hyperlink != null)
{
int index = p.Inlines.IndexOf(hyperlink);
Span span = new Span();
foreach (var inline in hyperlink.Inlines.ToArray())
{
hyperlink.Inlines.Remove(inline);
span.Inlines.Add(inline);
}
// You may need code here to preserve the Font properties etc from hyperlink to span.
p.Inlines[index] = span;
break;
}
}