HtmlAgilityPack.HtmlWeb hw = new HtmlAgilityPack.HtmlWeb();
            HtmlAgilityPack.HtmlDocument doc = hw.Load("C:\\Users\\u1\\Desktop\\test html.html");
            HtmlAgilityPack.HtmlNode rootNode = doc.DocumentNode;//获取文档的根节点                                                                                       //   //*[@id="report1"]/tbody
            string xpath = "//*[@id='report1']/tbody";
            HtmlAgilityPack.HtmlNode node = rootNode.SelectSingleNode(xpath);//获取表格
            foreach (var script in node.Descendants("script").ToArray())
                script.Remove();
            foreach (var style in node.Descendants("style").ToArray())
                style.Remove();
            string innerText = node.OuterHtml;//到这里就是纯纯的表格了      
            var trNodes = node.SelectNodes("tr");
            DataTable dt = new DataTable();
            for (int i = 0; i < 100; i++)   //给表格增加100个列
            {
                DataColumn dc = new DataColumn();
                dt.Columns.Add(dc);
            }
            foreach (var trnod in trNodes) //遍历行
            {
                //dt.Rows.Add()
                DataRow dr = dt.NewRow();
                var tdNodes = trnod.SelectNodes("td");
                for (int i = 0; i < tdNodes.Count; i++) //遍历列
                {
                    dr[i] = tdNodes[i].InnerText;
                }
                dt.Rows.Add(dr);
            }
            // 所有的数据读取到了datatable 中