使用html Agility Pack选择属性值

Question

我正在尝试使用html敏捷包和此xpath从html文档中检索特定图像:

//div[@id='topslot']/a/img/@src

据我所知,它找到了src-attribute,但它返回了img-tag.这是为什么？

我希望设置InnerHtml/InnerText或其他东西,但两者都是空字符串.OuterHtml设置为完整的img-tag.

有没有Html Agility Pack的文档？

Answer 1

如果使用,则可以直接获取属性HtmlNavigator.

//Load document from some html string
HtmlDocument hdoc = new HtmlDocument();
hdoc.LoadHtml(htmlContent);

//Load navigator for current document
HtmlNodeNavigator navigator = (HtmlNodeNavigator)hdoc.CreateNavigator();

//Get value from given xpath
string xpath = "//div[@id='topslot']/a/img/@src";
string val = navigator.SelectSingleNode(xpath).Value;

Answer 2

Html Agility Pack 不支持属性选择.

Answer 3

您可以使用方法"GetAttributeValue".

例:

//[...] code before needs to load a html document
HtmlAgilityPack.HtmlDocument htmldoc = e.Document;
//get all nodes "a" matching the XPath expression
HtmlNodeCollection AllNodes = htmldoc.DocumentNode.SelectNodes("*[@class='item']/p/a");
//show a messagebox for each node found that shows the content of attribute "href"
foreach (var MensaNode in AllNodes)
{
     string url = MensaNode.GetAttributeValue("href", "not found");
     MessageBox.Show(url);
}