I have to retrieve the Foreground property of the selected text in a WPF RichtTextBox, but I think, there is a bug in the TextRange.GetPropertyValue function. I've written a simple application to test the error:
<RichTextBox x:Name="rtfBox">
<RichTextBox.Document>
<FlowDocument>
<Paragraph>
<Run>run run run</Run>
<Hyperlink TargetName="http://stackoverflow.com">stackoverflow.com</Hyperlink>
</Paragraph>
</FlowDocument>
</RichTextBox.Document>
</RichTextBox>
<Button Content="Click!" Height="28" Click="Button_Click" />
And in the code behind:
private void Button_Click(object sender, RoutedEventArgs e)
{
var textrange = new TextRange(rtfBox.Selection.Start, rtfBox.Selection.End);
var propertyValue = textrange.GetPropertyValue(TextElement.ForegroundProperty);
MessageBox.Show(propertyValue.ToString());
}
When I select the first few characters of the stackoverflow hyperlink, the MessageBox says that the Foreground property is a DependencyProperty.UnsetValue, but when I select other parts of the link, it shows the true foreground color.
It looks like a bug.
Are there any workaround for this problem?
