Parsing html table exception

Asked Nov 30 '16 at 12:37

Active Nov 27 '17 at 11:19

Viewed 264 times

I am getting the below error while parsing html table with c#

"An exception of type 'System.NullReferenceException' occurred in App_Web_k1wz0vym.dll but was not handled in user code

Additional information: Object reference not set to an instance of an object."

at line " foreach (HtmlNode row in table.SelectNodes("tr"))"

Below is my code

HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();

string s = requestsTable.InnerHtml.ToString();
doc.LoadHtml(s);

foreach (HtmlNode table in doc.DocumentNode.SelectNodes("table"))
{
    foreach (HtmlNode row in table.SelectNodes("tr"))
    {
        ///This is the row.
        foreach (HtmlNode cell in row.SelectNodes("th|td"))
        {
            Response.Write("<br>"+cell.InnerText);
        }
    }
 }

edited Nov 27 '17 at 11:19

melya

asked Nov 30 '16 at 12:37

Chaitanya

Possible duplicate of [What is a NullReferenceException, and how do I fix it?](http://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-and-how-do-i-fix-it) – krillgar Nov 30 '16 at 12:38
This is usually quite easy to debug. Check on this line, what object is "null". I would expect "table" to be null or table.SelectNodes() to be null. Then you can find out WHY it is null. – Ole Albers Nov 30 '16 at 12:39
Seems that you cant find 's in document root node, or some table is empty without rows.
– Markiian Benovskyi Nov 30 '16 at 12:40
But Table is loaded. error occurred during parsing the row. – Chaitanya Nov 30 '16 at 12:46
@Chaitanya try to use debugger, debug the foreach method, find out what row is null – Markiian Benovskyi Nov 30 '16 at 13:57

Parsing html table exception

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