Question

I’m creating HtmlDocument and using LoadHtml(string). My input html string sometimes contains symbols < and > in it. So html parses incorrectly, for example:

My html is
<p>Value < 20 A B C</p>

And my document OutputHtml in this case is
<p>Value < 20="" a="" b=""></p>

Maybe there are some flags I have to set in HtmlDocument, but I didn’t find anything helpful.

P.S. HtmlNode has the same behaviour.

Answer 1

The best way to solve the problem is to change the caharacter < in &lt (There is no need to change the character >)

To know when the the character < is of tag, and when it ‘smaller than’ you can ask with if
Here the code:

public static string CreateCorrectHtmlDoc(string htmlDoc)
        {
            int i = 0;
            List<int> index = new List<int>();
            try
            {
                //look for '<' 
                while ((i = htmlDoc.IndexOf("<", i)) != -1)
                {
                    i += 1;
                    //regex to find '<' that is no tag
                    if (Regex.IsMatch(htmlDoc[i].ToString(), "\\d|-") || Regex.IsMatch(htmlDoc[i].ToString(), "[^a-zA-Z!]") && Regex.IsMatch(htmlDoc[i + 1].ToString(), "\\d\\s|-|\\d"))
                    {
                        htmlDoc = htmlDoc.Substring(0, i - 1) + "&lt" + htmlDoc.Substring(i + 1);
                    }
                }
            }
            catch
            {
                Log.Insert("Error: CreateCorrectHtmlDoc");
                return "";
            }
            return htmlDoc;
        }

I’m using it, and it is working perfect