/// <summary>
        /// 在百度知道查询答案。
        /// </summary>
        /// <param name="sentence">要查询的句子</param>
        /// <param name="num">获取的答案数</param>
        /// <returns></returns>
        public string[] getBaiduZhidaoAnswers(string sentence, int num = 10)
        {
            List <string> res = new List <string>();

            try
            {
                string url  = $"https://zhidao.baidu.com/search?word={WebConnectActor.UrlEncode(sentence)}";
                string html = WebConnectActor.getData(url, Encoding.GetEncoding("gb2312"), cookie);
                //FileIOActor.log(url);
                //FileIOActor.log(html);

                HtmlDocument hdoc = new HtmlDocument();
                hdoc.LoadHtml(html);
                HtmlNode favurl = null;
                try
                {
                    var node = hdoc.DocumentNode.SelectSingleNode("//dt[@class=\"dt mb-8\"]");
                    if (node != null)
                    {
                        favurl = node.ChildNodes[1];
                    }
                }
                catch (Exception ex) { FileIOActor.log(ex); }

                var urls = hdoc.DocumentNode.SelectNodes("//a[@class=\"ti\"]");
                if (favurl != null)
                {
                    urls.Insert(0, favurl);
                }
                foreach (var aurl in urls)
                {
                    string dw       = ItemParser.removeBlank(aurl.GetAttributeValue("href", ""), true);
                    var    areslist = getBaiduZhidaoAnswersByUrl(dw);
                    if (areslist.Length > 0)
                    {
                        res.Add(areslist[0].Trim());
                    }
                    if (res.Count > num)
                    {
                        break;
                    }
                }
            }
            catch (Exception ex) { FileIOActor.log(ex); }

            return(res.ToArray());
        }
        /// <summary>
        /// 暂时不可用
        /// </summary>
        /// <param name="question"></param>
        /// <returns></returns>
        public string getAsklibResult(string question)
        {
            string url = string.Format("http://www.asklib.com/s/{0}", WebConnectActor.UrlEncode(question));
            string res = "";
            //List<string> res = new List<string>();
            string       html = WebConnectActor.getData(url, Encoding.UTF8);
            HtmlDocument hdoc = new HtmlDocument();

            hdoc.LoadHtml(html);
            try
            {
                HtmlNode favurl = null;
                try
                {
                    //res = html; return res;
                    favurl = hdoc.DocumentNode.SelectSingleNode("//div[@class=\"p15 right\"]").ChildNodes[1];
                    url    = ItemParser.removeBlank(favurl.GetAttributeValue("href", ""), true);
                    url    = "http://www.asklib.com/" + url;
                    html   = WebConnectActor.getData(url, Encoding.UTF8);
                    hdoc   = new HtmlDocument();
                    hdoc.LoadHtml(html);
                    var           tmp = getText(hdoc.DocumentNode.SelectSingleNode("//div[@class=\"listtip\"]").InnerHtml);
                    StringBuilder sb  = new StringBuilder();
                    foreach (var t in tmp)
                    {
                        if (!string.IsNullOrWhiteSpace(t.Trim()))
                        {
                            sb.Append(t + "\r\n");
                        }
                    }
                    sb.Replace("\r\n\r\n", "\r\n");
                    res = sb.ToString();
                }
                catch {  }
            }
            catch { }

            return(res);
        }
        //public static string[] getSearchResult(string words, int pagenum = 10)
        //{
        //    List<string> reslist = new List<string>();
        //    for (int i = 0; i < pagenum; i++)
        //    {

        //        string askUrl = "http://www.baidu.com/s?wd=" + WebConnectHelper.UrlEncode(words) + "&pn=" + (i * 10);
        //        string res = WebConnectHelper.getData(askUrl, Encoding.UTF8);
        //        res = res.Replace("\n", "").Replace("\r", "");
        //        HtmlDocument hdoc = new HtmlDocument();
        //        hdoc.LoadHtml(res);

        //        HtmlNodeCollection collection = hdoc.DocumentNode.SelectNodes("//*[@class=\"c-abstract\"]");
        //        if (collection != null)
        //        {
        //            foreach (HtmlNode node in collection)
        //            {
        //                reslist.Add(node.InnerText);
        //            }
        //            collection = hdoc.DocumentNode.SelectNodes("//*[@class=\"t\"]");
        //            foreach (HtmlNode node in collection)
        //            {
        //                reslist.Add(node.InnerText);
        //            }
        //        }
        //        else
        //        {
        //            return null;
        //        }

        //    }

        //    return reslist.ToArray();
        //}

        public string[] getWebsiteAnswer(string question)
        {
            List <string> answer = new List <string>();
            string        askUrl = "http://www.baidu.com/s?wd=" + WebConnectActor.UrlEncode(question);
            string        res    = WebConnectActor.getData(askUrl, Encoding.UTF8, cookie);

            res = res.Replace("\n", "").Replace("\r", "").Replace(" ", "");
            Regex reg = new Regex("class=\"op_exactqa_s_answer\">(.*?)</div>");

            if (reg.IsMatch(res))
            {
                //说明百度首页给出了智能答案
                res = reg.Match(res).Groups[1].ToString();
                reg = new Regex("target=\"_blank\">(.*?)</a>");
                if (reg.IsMatch(res))
                {
                    res = reg.Match(res).Groups[1].ToString();
                    answer.Add(res);
                }
            }
            else
            {
                //判断是否是百度统计相关答案
                reg = new Regex("<p class='op_gdp_subtitle'>(.*?)</p>");
                if (reg.IsMatch(res))
                {
                    res = reg.Match(res).Groups[1].ToString();
                    answer.Add(res);
                }
                else
                {
                    //判断是否是计算题答案
                    reg = new Regex("line-height:22px;padding-bottom:2px;width:474px;\">(.*?)</div>");
                    if (reg.IsMatch(res))
                    {
                        res = reg.Match(res).Groups[1].ToString().Replace("&nbsp;", " ");
                        answer.Add(res);
                    }
                    else
                    {
                        string tmpstr = "正在百度问题:" + question;
                        answer.Add(tmpstr);
                        //去百度知道查一波
                        askUrl = "http://zhidao.baidu.com/search?word=" + question;
                        res    = WebConnectActor.getData(askUrl, Encoding.Default, cookie);
                        res    = res.Replace("\n", "").Replace("\r", "").Replace(" ", "");

                        //如果rank较低就舍弃
                        reg = new Regex("data-rank=\"(.*?)\"");
                        if (reg.IsMatch(res))
                        {
                            string rank      = reg.Match(res).Groups[1].ToString().Split(':')[0];
                            int    rankvalue = Int32.Parse(rank);
                            if (rankvalue <= 500)
                            {
                                //rank太低了,不再查询答案。
                                //return false;
                            }
                        }

                        reg = new Regex("data-log-area=\"list\">(.*?)</a>");
                        if (reg.IsMatch(res))
                        {
                            res = reg.Match(res).Groups[1].ToString();
                            reg = new Regex("href=\"(.*?)\"");
                            if (reg.IsMatch(res))
                            {
                                //从知道首页找到最接近的答案的url
                                askUrl = reg.Match(res).Groups[1].ToString();
                                res    = WebConnectActor.getData(askUrl, Encoding.Default, cookie).Replace("\n", "").Replace("\r", "").Replace(" ", "");

                                Regex[] regs = new Regex[] {
                                    //被采纳答案
                                    new Regex("wgt-best(.*?)i-quality-icon"),
                                    new Regex("wgt-best(.*?)answer-share-widget"),
                                    //尝试优质答案
                                    new Regex("quality-content-detailcontent\">(.*?)</div>"),
                                    //尝试网友推荐答案
                                    new Regex("wgt-recommend(.*?)i-quality-icon")
                                };
                                bool ismatch = false;
                                foreach (var treg in regs)
                                {
                                    if (treg.IsMatch(res))
                                    {
                                        //tmpOutputSentence.Add(res);
                                        res     = treg.Match(res).Groups[1].ToString();
                                        ismatch = true;
                                        break;
                                    }
                                }
                                if (ismatch)
                                {
                                    reg = new Regex("<pre(.*?)>(.*?)</pre>");
                                    if (reg.IsMatch(res))
                                    {
                                        res = reg.Match(res).Groups[2].ToString();
                                        res = res.Replace("<br>", "\r\n");
                                        res = res.Replace("<br/>", "\r\n");
                                        res = replaceImageWords(res);
                                        answer.Add(res);
                                    }
                                }



                                //{

                                //    reg = ;
                                //    if (reg.IsMatch(res))
                                //    {
                                //        res = reg.Match(res).Groups[1].ToString();
                                //        res = res.Replace("<br>", "\r\n");
                                //        res = res.Replace("<br/>", "\r\n");
                                //        res = replaceImageWords(res);
                                //        tmpOutputSentence.Add(res);
                                //        isa = true;
                                //    }
                                //    else
                                //    {
                                //        ;
                                //        if (reg.IsMatch(res))
                                //        {
                                //            res = reg.Match(res).Groups[1].ToString();
                                //            reg = new Regex("<pre(.*?)>(.*?)</pre>");
                                //            if (reg.IsMatch(res))
                                //            {
                                //                res = reg.Match(res).Groups[2].ToString();
                                //                res = res.Replace("<br>", "\r\n");
                                //                res = res.Replace("<br/>", "\r\n");
                                //                res = replaceImageWords(res);
                                //                tmpOutputSentence.Add(res);
                                //                isa = true;
                                //            }
                                //        }
                                //    }
                                //}
                            }
                        }
                    }
                }
            }



            return(answer.ToArray());
        }
        public string[] getBaiduTiebaAnswers(string sentence, int num = 10)
        {
            string        url  = string.Format("http://tieba.baidu.com/f/search/res?ie=utf-8&qw=%20{0}", WebConnectActor.UrlEncode(sentence));
            List <string> res  = new List <string>();
            string        html = WebConnectActor.getData(url, Encoding.GetEncoding("gb2312"));
            HtmlDocument  hdoc = new HtmlDocument();

            hdoc.LoadHtml(html);

            try
            {
                HtmlNodeCollection tiezinodes = null;
                try
                {
                    tiezinodes = hdoc.DocumentNode.SelectNodes("//div[@class=\"p_content\"]");
                    if (tiezinodes == null)
                    {
                        return(res.ToArray());
                    }
                    int numm = 0;
                    foreach (var node in tiezinodes)
                    {
                        string content = removeReplyWords(node.InnerText);
                        content = string.Join("\r\n", getText(content)).Trim();
                        //bool useful = true;
                        int dontmatch = 0;
                        foreach (char c in sentence)
                        {
                            if (!content.Contains(c))
                            {
                                dontmatch++;
                                //useful = false;
                                //break;
                            }
                        }
                        if (dontmatch <= 2)
                        {
                            res.Add(content);
                            numm++;
                            if (numm >= num)
                            {
                                break;
                            }
                        }
                    }
                }
                catch { }
            }
            catch { }

            return(res.ToArray());
        }
        /// <summary>
        /// 从百度知识图谱中寻找答案
        /// 基本就是把关键词放入百度搜索,然后看百度有没有智能返回的结果
        /// </summary>
        /// <param name="words"></param>
        /// <returns></returns>
        public string[] getBaiduKGResult(string words)
        {
            List <string> reslist = new List <string>();
            string        askUrl  = "https://www.baidu.com/s?ie=utf-8&wd=" + WebConnectActor.UrlEncode(words);
            string        html    = WebConnectActor.getData(askUrl, Encoding.UTF8, cookie);
            //var html1 = HttpUtility.UrlDecode(html);
            //var html2 = Regex.Unescape(html);
            //FileIOActor.log(askUrl);
            //FileIOActor.log(html);
            HtmlDocument hdoc = new HtmlDocument();

            hdoc.LoadHtml(html);
            HtmlNode tnode = null;

            //统计数值
            try
            {
                tnode = hdoc.DocumentNode.SelectSingleNode("//*[@class=\"op_gdp_subtitle\"]");
                if (tnode != null)
                {
                    string gdp = parser.removeUnText(tnode.InnerText);
                    reslist.Add(gdp);
                }
            }
            catch { }

            //图谱常识
            try
            {
                tnode = hdoc.DocumentNode.SelectSingleNode("//*[@class=\"op_exactqa_s_answer\"]");
                if (tnode != null)
                {
                    string common = parser.removeUnText(tnode.InnerText);
                    reslist.Add(common);
                }
            }
            catch { }

            //股票
            //try
            //{
            //    string gp = ItemParser.removeUnText(hdoc.DocumentNode.SelectSingleNode("//*[@class=\"op_stockweakdemand_cur_num c-gap-right-small\"]").InnerText);
            //    reslist.Add(gp);
            //    string gpzf = ItemParser.removeUnText(hdoc.DocumentNode.SelectSingleNode("//*[@class=\"op_stockweakdemand_cur_info c-gap-icon-right-small\"]").InnerText);
            //    reslist.Add(gpzf);
            //}
            //catch { }
            try
            {
                tnode = hdoc.DocumentNode.SelectSingleNode("//*[@class=\"op-stockdynamic-moretab-cur-num c-gap-right-small\"]");
                if (tnode != null)
                {
                    string gp = parser.removeUnText(tnode.InnerText);
                    reslist.Add(gp);
                    tnode = hdoc.DocumentNode.SelectSingleNode("//*[@class=\"op-stockdynamic-moretab-cur-unit\"]");
                    if (tnode != null)
                    {
                        string gpzf = tnode.InnerText.Trim();
                        tnode = hdoc.DocumentNode.SelectSingleNode("//*[@class=\"op-stockdynamic-moretab-cur\"]");
                        if (tnode != null)
                        {
                            gpzf = tnode.InnerText.Trim();
                            foreach (var s in new string[] { "美元", "元", "镑" })
                            {
                                if (gpzf.Contains(s))
                                {
                                    gpzf = s; break;
                                }
                            }
                            reslist.Add(gpzf);
                        }
                    }
                }
            }
            catch { }

            //热线电话
            try
            {
                tnode = hdoc.DocumentNode.SelectSingleNode("//*[@class=\"op_kefupoly_td2\"]");
                if (tnode != null)
                {
                    string rx = parser.removeUnText(tnode.InnerText);
                    reslist.Add(rx);
                }
            }
            catch { }


            ////翻译
            //try
            //{
            //    string trans = parser.removeUnText(hdoc.DocumentNode.SelectSingleNode("//*[@class=\"op_sp_fanyi_line_two\"]").InnerText);
            //    reslist.Add(trans);
            //}
            //catch { }

            //数学运算
            try
            {
                tnode = hdoc.DocumentNode.SelectSingleNode("//*[@class=\"op_new_val_screen_result\"]");
                if (tnode != null)
                {
                    string trans = parser.removeUnText(tnode.InnerText);
                    //string trans = ItemParser.removeUnText(hdoc.DocumentNode.SelectSingleNode("//*[@style=\"font-size:1.4em;line-height:22px;padding-bottom:2px;width:474px;\"]").InnerText);
                    reslist.Add(trans.Trim());
                }
            }
            catch { }

            //汇率换算
            try
            {
                tnode = hdoc.DocumentNode.SelectSingleNode("//*[@class=\"op_exrate_result\"]");
                if (tnode != null)
                {
                    string hl = parser.removeUnText(tnode.InnerText);
                    reslist.Add(hl);
                }
            }
            catch { }

            //单位换算
            try
            {
                var    res = Regex.Match(html, " tab\\:(.*?),\\\n        rank", RegexOptions.Singleline).Groups[1].Value.Trim();
                string num = Regex.Match(res, "numres\\\":\\\"(.*?)\\\",").Groups[1].Value.Trim();
                string dw  = Regex.Match(res, "to_syn\\\":\\\"(.*?)\\\",").Groups[1].Value.Trim();
                dw = Regex.Unescape(dw);
                if (num.Length <= 0)
                {
                    throw new Exception("not answer");
                }
                //string dw = ItemParser.removeUnText(hdoc.DocumentNode.SelectSingleNode("//*[@class=\"op-unit-result c-clearfix\"]").InnerText);
                //reslist.Add(dw);
                reslist.Add(num + dw);
            }
            catch { }

            //邮编
            try
            {
                tnode = hdoc.DocumentNode.SelectSingleNode("//*[@class=\"op_post_content \"]");
                if (tnode != null)
                {
                    string dw = parser.removeUnText(tnode.InnerText);
                    reslist.Add(dw);
                }
            }
            catch { }


            // 百度知道最佳答案
            // 去所跳转的页面上找答案
            try
            {
                tnode = hdoc.DocumentNode.SelectSingleNode("//*[@class=\"op_best_answer_question_link\"]");
                if (tnode != null)
                {
                    string dw      = parser.removeUnText(tnode.GetAttributeValue("href", ""));
                    var    answers = getBaiduZhidaoAnswers(dw)[0];
                    reslist.Add(answers);
                }
            }
            catch { }

            // 百度知道的推荐答案的第一个
            // 去所跳转的页面上找答案
            try
            {
                tnode = hdoc.DocumentNode.SelectSingleNode("//*[@class=\"op_generalqa_answer c-gap-bottom-small op_generalqa_answer_first\"]");
                if (tnode != null)
                {
                    string dw      = parser.removeUnText(tnode.ChildNodes[3].FirstChild.GetAttributeValue("href", ""));
                    var    answers = getBaiduZhidaoAnswersByUrl(dw)[0];
                    reslist.Add(answers);
                }
            }
            catch { }

            // 百度日历上的日子
            // 由于它是js生成的日历,所以需要从js里正则匹配一下
            try
            {
                Regex  reg  = new Regex("\"selectday\":\"([^\"]*?)\"", RegexOptions.None);
                string date = reg.Match(html).Groups[1].Value;
                if (!string.IsNullOrWhiteSpace(date))
                {
                    reslist.Add(date);
                }
            }
            catch { }


            return(reslist.ToArray());
        }