如何在C#中手动将大的RTF字符串转换为HTML字符串？

string rtfString = "Your RTF string";
string plainText;

using (RichTextBox richTextBox = new RichTextBox())
{
    richTextBox.Rtf = rtfString;
    plainText = richTextBox.Text;
}

string htmlString;

using (StringWriter stringWriter = new StringWriter())
{
    using (HtmlTextWriter htmlWriter = new HtmlTextWriter(stringWriter))
    {
        string[] lines = plainText.Split(new[] { Environment.NewLine }, StringSplitOptions.None);

        foreach (string line in lines)
        {
            htmlWriter.WriteEncodedText(line);
            htmlWriter.RenderBeginTag(HtmlTextWriterTag.Br);
        }
    }

    htmlString = stringWriter.ToString();
}