Broken hyperlinks in RTF file in RichTextBox

Question

I use RichTextBoxto display an RTF file that includes one hyperlink. The link text is not a URL (the target is a valid URL). RTF was created using Word. Both Word and WordPad correctly recognize links (WordPad does not launch links, but shows the corresponding cursor on the hand).

When I load RTF into RichTextBoxlinks, they are displayed correctly formatted (blue and underlined), but instead of behaving like a link, when the cursor moves over the link, it remains an I- LinkClickedray, the event LinkClickedwill not work, and it actually shows the target between the angle brackets after links (this does not seem correct). Since the link text is not a URL, DetectUrlsthis will not help.

Is there a reason why RichTextBoxthese links are not properly handled or a way to make them work as expected?

Here is the code

TipView.Rtf = tips[tipIndex];
// I've also tried TipView.LoadFile, with identical result

To reproduce the problem, create an RTF document with Word (I use 2000) containing one link, the text of which is not a URL, but is intended for a valid URL, and programmatically load the .rtf file into RichTextBox(I use .NET 2.0 in C # Express 2008).

Answer 1

To support hyperlinks, you will need the "rich edit" version . RICHEDIT50W

For this:

• Or use the .NET Framework 4.7, which is originally used RICHEDIT50Win RichTextBox.

• In older versions of the .NET Framework, you can change RichTextBoxto use RICHEDIT50W:

  public class ExRichText : RichTextBox
  {
      [DllImport("kernel32.dll", EntryPoint = "LoadLibraryW",
                 CharSet = CharSet.Unicode, SetLastError = true)]
      private static extern IntPtr LoadLibraryW(string s_File);
  
      protected override CreateParams CreateParams
      {
          get
          {
              var cp = base.CreateParams;
              LoadLibraryW("MsftEdit.dll");
              cp.ClassName = "RichEdit50W";
              return cp;
          }
      }
  }
  

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RichTextBox Selection Highlight RichTextBox - Unicode.