C# html agility pack get elements by class name

问题

I'm trying to get all the divs that their class contains a certain word:

<div class="hello mike">content1</div>
<div class="hello jeff>content2</div>
<div class="john">content3</div>

I need to get all the divs that their class contains the word "hello". Something like this:

resultContent.DocumentNode.SelectNodes("//div[@class='hello']"))

how can i do it with agility pack?

回答1:

I got it:

resultContent.DocumentNode.SelectNodes("//div[contains(@class, 'hello')]"))

回答2:

I'm sure because there're multiple classes in your div, that doesn't work. You can try this instead:

resultContent.DocumentNode.Descendants("div").Where(d => d.Attributes["class"].Value.Contains("hello"));

回答3:

As I wrote here, as of version v1.6.5 of Html Agility Pack, it contains .HasClass("class-name") extension methoda.

IEnumerable<HtmlNode> nodes =
    htmlDoc.DocumentNode.Descendants(0)
        .Where(n => n.HasClass("class-name"));

回答4:

as you have specified that the class has to contain a certain word, the following will ensure that the word is:

at the start of the string and followed by a space
or in the middle of the string and surrounded by whitespace
or at the end of the string and preceded by a space
or the only class name in the class attribute

It does so by comparing the value of the class attribute surrounded by spaces with the specified word (hello) surrounded by spaces. This is to avoid false positives like class="something-hello-something"

resultContent.DocumentNode.SelectNodes("//div[contains(concat(' ', @class, ' '), ' hello ')]");

回答5:

HtmlDocument htmlDoc = new HtmlAgilityPack.HtmlDocument();
htmlDoc.Load(filePath);
 foreach(HtmlNode link in doc.DocumentElement.SelectNodes("//div[@class='hello']")
 {
    //code
 }

来源：https://stackoverflow.com/questions/36711680/c-sharp-html-agility-pack-get-elements-by-class-name

标签

html

html-agility-pack