How can i get the content of head tag in html

Asked Dec 04 '15 at 23:46

Active Sep 26 '19 at 17:55

Viewed 26 times

I already initialized my _chaptername in the top of my code as

private static string _chapterName = "";

but still i receive an error that an object reference is not set to an instance of an object. What initialization should be done in my case? I encounter no problem if my input is multiple files, but when my input is only 1 this error occur(object reference is not set to an instance of an object).

var content = string.Empty;
            content =  File.ReadAllText(inputName);
            if (content.Contains("<h1"))
            {
                _chapterName = inputXDoc.XPathSelectElement("//h1").Value;
            }
            else if (content.Contains("<h2"))
            {
                _chapterName = inputXDoc.XPathSelectElement("//h2").Value;
            }
            else if (content.Contains("<h3"))
            {
                _chapterName = inputXDoc.XPathSelectElement("//h3").Value;
            }
            else if (content.Contains("<h4"))
            {
                _chapterName = inputXDoc.XPathSelectElement("//h4").Value;
            }

edited Sep 26 '19 at 17:55

asked Dec 04 '15 at 23:46

Erwin Alcantara

XPathSelectElement could return a null value if it doesn't find any match. Directly using the Value property will lead to this problem. Read http://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-and-how-do-i-fix-it – Steve Dec 04 '15 at 23:49
Put a break point on `content` and `inputXDoc` my guess is one of these is null – Julius Depulla Dec 04 '15 at 23:53
I already check my file with the target of my XPathSelectElement
Blah blah¹
– Erwin Alcantara Dec 04 '15 at 23:59
My code should return **Blah blah**. but it returns null – Erwin Alcantara Dec 05 '15 at 00:06
If I'm not mistaken the issue is that your conditions are checking for " – Kevin Dec 05 '15 at 00:20
@KevinWells, my code works in multiple html, but in one html file, this cause an error. – Erwin Alcantara Dec 05 '15 at 00:49
working demo is here http://rextester.com/HNYT47794 – Erwin Alcantara Dec 05 '15 at 01:31
@Steve here is the working code.. http://rextester.com/HNYT47794d – Erwin Alcantara Dec 05 '15 at 01:48
here http://rextester.com/TAL82060 – Erwin Alcantara Dec 05 '15 at 01:50

How can i get the content of head tag in html

Blah blah1

0 Answers0

Blah blah¹