Question
I am using Html Agility Pack to see if divs with a specific class and id exist.
string target = "http://192.168.3.230/index.htm";
WebClient client = new WebClient();
string html = client.DownloadString(target);
HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
doc.LoadHtml(html);
if (doc.DocumentNode.SelectSingleNode("//div[@id='bit0' and @class='rledoff']") != null){
//actions in here
}
else if (doc.DocumentNode.SelectSingleNode("//div[@id='bit0' and @class='rledon']") != null)
{
//actions in here
}
Currently the else if should be true, but it is doing the actions in the if statement. I have seen this work correctly when I did
doc.Load("c:\\somelocaldest\\page.htm");
When I try to do it from the actual site instead of a locally saved file of the site it will see that the id is correct and disregard the class. What could cause it to behave differently between getting the html for a local file and from an external site/device?
Popular Answer
First of all I suggest you to do this, for me it worked faster than WebClient.
HtmlWeb web = new HtmlWeb();
HtmlDocument doc = web.Load(target);
If you say that this works on local hmtl file and not work when the html is on the server, then do the following.
File.WriteAllText(path,doc.DocumentNode.OuterHtml);
Sometimes the source code of page its differ when you download it with htmlweb (or webclient) so make again your xpath by using this new html file.