Keywords from a Web Page

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How can i generate keywords and thier count from a webpage using C#.

I have got the web page into string using HTMLAgilityPack and then converted them into words into a arraylist.

But now filter the keyword as adding their counts on the side by removing the duplicate.

My Code:

//Uses HtmlAgilityPack
var webGet = new HtmlWeb();
var doc = webGet.Load(url);

HtmlNode bodyContent = doc.DocumentNode.SelectSingleNode("/html/body");

            if (bodyContent != null)
            {
                pmd.Html = stripHtml(bodyContent.InnerHtml.ToString());                
            }  

string wordsOnly = pmd.Html;

string[] arrayWordsOnly = wordsOnly.Split(' ');                    
                    char[] spChar = new char[] { '?', '\"', ',', '\'', ';', ':', '.', '(', ')', '!' };

foreach (string word in arrayWordsOnly)
{
   key = word.Trim(spChar).ToLower();                           
}

protected string stripHtml(string strHtml)
        {
            //Strips the HTML tags from strHTML
            Regex objRegExp = new Regex("&lt;(.|\n)+?&gt;");
            string strOutput;
            //Replace all HTML tag matches with the empty string
            strOutput = objRegExp.Replace(strHtml, "");
            strOutput = strOutput.Replace("&lt;", "&amp;lt;");
            strOutput = strOutput.Replace("&gt;", "&amp;gt;");
            objRegExp = null;
            return strOutput;
        }

Posted 24-Mar-11 13:39pm

Kishore Jangid

Updated 24-Mar-11 17:29pm

Henry Minute

v4

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Henry Minute · Answer 1 · 2011-03-24T17:38:00

Firstly, you talk about using an ArrayList, this is no longer recommended. You should probably use a List<string> (MSDN page[^]).

Accepting that you do this, something like the following should do the trick:

C#

List<string> uniqueWords = new List<string>();
foreach (string word in arrayWordsOnly)
{
   key = word.Trim(spChar).ToLower();
   if (!uniqueWords.Contains(key))
   {
      uniqueWords.Add(key);
   }
}

If you are determined to use ArrayList then simply replace each occurrence of List<string> with ArrayList