HtmlAgilityPack xpath问题 ！！！

Question

public static readonly string xpath = "/html/body/div[6]/div[2]/div[1]/ul[1]/li", url = "www.zerodm.cn"; string html = HAPCommon.GetHtmlContentByURL(string.Format("http://{0}/", url)); HtmlAgilityPack.HtmlDocument htmldoc = new HtmlAgilityPack.HtmlDocument(); 　　　　　　　　　 htmldoc.LoadHtml(html); 　　　　　　　　　　HtmlNodeCollection nodes = htmldoc.DocumentNode.SelectNodes(xpath); //HtmlAgilityPack.HtmlNode xhtml = new HtmlAgilityPack.HtmlNode(HtmlAgilityPack.HtmlNodeType.Element,htmldoc, 0); return nodes; Nodes is  null   xpath 是用 Firebug 找到的路径