Extract RTF formatted text from WPF FlowDocument

Marius 1

Hello everybody,

I have a WPF FlowDocument which contains many Paragraphs. Each paragraph has a different LineHeight. Now, I want to save the FlowDocument as an RTF file using the code above but if there is a LineHeight property set for a paragraph, then it get lost, it's not saved. I've read somewhere that the DateFormats.Rtf leads to such behavior and it is recommanded to use DataFormats.Xaml instead, but I need the RTF formatted text.

        public static string ToRtf(this string text)
        {
            var stringReader = new StringReader(text);
            var xmlReader = XmlReader.Create(stringReader);
            var sec = XamlReader.Load(xmlReader) as Section;
            var doc = new FlowDocument();
            foreach (var block in sec.Blocks.ToArray())
            {
                var fontFamily = block.FontFamily;
                doc.Blocks.Add(block);
                if (block.FontFamily != fontFamily) // because of unexpected reason the font get lost
                    block.FontFamily = fontFamily;
            }
            sec.Blocks.Clear();

            using (var memoryStream = new MemoryStream())
            {
                new TextRange(doc.ContentStart, doc.ContentEnd).Save(memoryStream, DataFormats.Rtf);
                return Encoding.Default.GetString(memoryStream.GetBuffer());
            }
        }

Is there a way to generate the RTF formatted text whitout loosing some properties?

Many thanks!

Hui Liu-MSFT 40,786 Microsoft Vendor

Hi,@Marius . For keeping the LineHeight property, could you use the Copy Document method?

private void CopyDocument(FlowDocument source, FlowDocument target)  
    {  
      TextRange sourceRange = new TextRange(source.ContentStart, source.ContentEnd);  
      MemoryStream stream = new MemoryStream();  
      XamlWriter.Save(sourceRange, stream);  
      sourceRange.Save(stream, DataFormats.XamlPackage);  
      TextRange targetRange = new TextRange(target.ContentStart, target.ContentEnd);  
      targetRange.Load(stream, DataFormats.XamlPackage);  
    }  
    private void Button_Click(object sender, RoutedEventArgs e)  
    {  
      CopyDocument(rtb.Document, rtb1.Document);  
    }