原文地址：

#region Activate Hyperlinks in the Rich Text box        //http://stackoverflow.com/questions/5465667/handle-all-hyperlinks-mouseenter-event-in-a-loaded-loose-flowdocument        void SubscribeToAllHyperlinks(FlowDocument flowDocument)        {            var hyperlinks = GetVisuals(flowDocument).OfType
     
      ();            foreach (var link in hyperlinks)                link.RequestNavigate += new System.Windows.Navigation.RequestNavigateEventHandler(link_RequestNavigate);        }        public static IEnumerable
      
        GetVisuals(DependencyObject root)        {            foreach (var child in LogicalTreeHelper.GetChildren(root).OfType
       
        ())            {                yield return child;                foreach (var descendants in GetVisuals(child))                    yield return descendants;            }        }        void link_RequestNavigate(object sender, System.Windows.Navigation.RequestNavigateEventArgs e)        {            //http://stackoverflow.com/questions/2288999/how-can-i-get-a-flowdocument-hyperlink-to-launch-browser-and-go-to-url-in-a-wpf            Process.Start(new ProcessStartInfo(e.Uri.AbsoluteUri));            e.Handled = true;        }        #endregion Activate Hyperlinks in the Rich Text box