HtmlAgilityPack未将对象引用设置到对象实例
HtmlDocument d = new HtmlDocument();d.LoadHtml(GetHtml(url));HtmlNode h1 =d.DocumentNode.SelectSingleNode(/*Chrome审查元素复制的Xpath*/);HtmlNode h2=d..GetElementbyId("id").SelectSingleNode(/*Chrome审查元素复制的Xpath*/);//h1和h2都为null,这是哪的错呢