Question

I have this method that parses my rich text to HTML. I noticed that is some places it is composing the inline style like this:

<DIV STYLE="text-align:Left;font-family:Segoe UI;font-style:normal;font-weight:normal;font-size:12;color:#000000;">

notice the font-size is missing the ‘pt’ at the end, which is breaking the report when I export to pdf.

Here is my code to handle it:

public static string RtfToHtml(string rtfText)
    {
        if (String.IsNullOrEmpty(rtfText)) return rtfText;
        if (!rtfText.Contains(@"{\rtf1")) return rtfText.Replace("\r\n", "<br>").Replace("\r", "<br>");

        Converter converter = new Converter();
        StringBuilder sb = new StringBuilder(converter.ConvertRtfToHtml(rtfText));
        sb.Replace("font-size:12;", "font-size:12pt;");

        try
        {
            HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
            doc.LoadHtml(sb.ToString());
            RemoveStyleTags(doc, "ol");
            RemoveStyleTags(doc, "ul");
            RemoveStyleTags(doc, "li");
            return doc.DocumentNode.InnerHtml;
        }
        catch { }

        return sb.ToString();
    }

My question is this: Is there a more elegant way to perform the .Replace() method rather that doing this:

sb.Replace("font-size:12;", "font-size:12pt;");
sb.Replace("font-size:13;", "font-size:13pt;");
sb.Replace("font-size:14;", "font-size:14pt;");
...
sb.Replace("font-size:10000;", "font-size:10000pt;");

Obviously what I am trying to do is find all the mistyped font-size declaration, append the pt, while keeping the integer size they already have.

Answer 1

You can use Regex.Replace(string input, string pattern, string replacement), like so:

public static string RtfToHtml(string rtfText)
{
    if (String.IsNullOrEmpty(rtfText)) return rtfText;
    if (!rtfText.Contains(@"{\rtf1")) return rtfText.Replace("\r\n", "<br>").Replace("\r", "<br>");

    Converter converter = new Converter();
    StringBuilder sb = new StringBuilder(converter.ConvertRtfToHtml(rtfText));
    string html = Regex.Replace(sb.ToString(), @"font-size:(\d*(\.\d+)?);", @"font-size:$1pt;");
    try
    {
        HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
        doc.LoadHtml(html);
        RemoveStyleTags(doc, "ol");
        RemoveStyleTags(doc, "ul");
        RemoveStyleTags(doc, "li");
        return doc.DocumentNode.InnerHtml;
    }
    catch { }

    return html;
}