Why does HtmlParser remove the line break tags?

Question

I'm using this HtmlFromXamlConverter from Microsoft and trying to display html script on a RichTextBox. HtmlToXamlConverter is working fine but HtmlFromXamlConverter isn't.

Example:

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If I convert this html script to XAML script using the HtmlToXamlConverter, it is shown on the RichTextBox as follows: Screenshot from RichTextBox

And then when I convert it back from XAML to html using HtmlFromXamlConverter and use the generated html code to display it on RichTextBox, it is shown on the RichTextBox as follows: Screenshot from RichTextBox (line breaks are no longer included)

This is the c# code that I use to convert from and to XAML

Convert from html to Xaml:

if(XamlReader.Parse(HtmlToXamlConverter.ConvertHtmlToXaml(File.ReadAllText(@"C:\Users\XXX\Documents	estHtml.html"), true)) is FlowDocument flowDoc)
{
           
      RichTextBox.Document = flowDoc;
}

Convert back from Xaml to html:

string str1 = XamlWriter.Save(RichTextBox.Document);
string str = XamlToHtmlConverter.ConvertXamlToHtml(str1);

I have been trying for a long time and no success. I am grateful for help

user_5623232 · Answer

Looks like this is a case of the converters not being symmetrical.

Try this:

Find in Files (Ctrl-Shift-F on Visual Studio), and search for "Paragraph". You'll see that it has matches in both ToXaml and FromXaml. They are responsible for converting
to and vice versa.
Now look for "LineBreak". This is the cause of your issue; it only exists in ToXaml but not the other way around.

The solution is simply to add a LineBreak handler in HtmlFromXamlConverter. Just add it next to the Paragraph handler.

case "Paragraph":
    htmlElementName = "p";
    break;
// Add these:
case "LineBreak":
    htmlElementName = "br";
    break;

That should do it.

NOTE: I hope you're not using

cause that's another one that wouldn't work, and will be harder to fix.

Why does HtmlParser remove the line break tags?

1 Answers