Question

我制作了一个简单的程序，用于在评论中提取youtube用户。这是代码

string html;
        using (var client = new WebClient())
        {
            html = client.DownloadString("http://www.youtube.com/watch?v=ER5EnjskCvE");
        }
        HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
        doc.LoadHtml(html);
        List<string> data = new List<string>();
        HtmlNodeCollection nodeCollection = doc.DocumentNode.SelectNodes("//*[@id='comments-view']/ul[1]/li[1]/a/span/span/span/span/img");
        foreach (HtmlNode node in nodeCollection)
        {
            data.Add(node.GetAttributeValue("alt",null));
        }

但我有一个问题，我的nodeCollection返回null。对于XPath，我在F12下的chrome中使用了copy XPath选项

Answer 1

试试这个替换“*”，“div”
"/html/body//div[@id='comments-view']/ul[1]/li[1]/a/span/span/span/span/img"

HtmlAgilityPack HtmlNodeCollection返回NULL，不应该

1 个答案: