小工具：火车票查询

{
  "validateMessagesShowId": "_validatorMessage",
  "status": true,
  "httpstatus": 200,
  "data": {
    "result": [
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      "wIpyiHG7PkQUnuOjE7gTxQAW39ihKOVttmAMx1lyhE10OyzjXjCe0EzyOsu28FOvw0Yc6CZF4CAQ%0AhR6L%2BAgyc6ca%2FYubiLZ4HuKw%2B0XmN5Us9fmA%2FajP3P%2FZgSoacqyPHPXEhWZ8pfGWSkmLMRNpisgd%0A48kWkp8rhjVIDljoncMagr6t5il3t5FaP8otqcN4ZtnTL1KfslpZt%2B2gxw7GwNFZH0QGTq2uoIuu%0AnYTSCB11w3Ok|预订|25000011360J|1136|TJP|WXC|TJP|XHP|20:52|01:55|05:03|Y|ZhbR6hnByAgL1ejqxJ1AIYiWcW2q08ZgO%2Bfk6UjtmX5mYLHGGlNBCiPVZDc%3D|20170901|3|P2|01|04|0|0||||无|||有||无|无|||||10401030|1413",
      "yG8TT6qCWjH0Aa2LVzxfCFGHf2q0syxOx7RfcXmsbFNyfq2VlWOS3q0oODd5tWAY2I5ddZfSBvnl%0A1GT%2BQCpZAhTPSLyRfDKCvwNMykAFe%2BuRULRPxd1WsQ57uIWepqDtElMcpGR8m7HB6KTnlzXXL9te%0AkumIJNMRMtA0ukPZto5G3sOGSSHgmQdcAxRmRdCVBFEsS9dNprjSQBwy%2BsxXq7KfAovJcemtY%2B3H%0AC7Kx4hnW5HXZ|预订|250000K8880H|K888|TJP|XNO|TJP|XHP|21:38|02:38|05:00|Y|uwEONiPztkLymI5okpF%2FJhWo7bzZA1zPcjbuofQXIXLCubD2gxSlXoz8nI8%3D|20170901|3|PB|01|04|0|0||||无|||有||无|有|||||10401030|1413"
    ],
    "flag": "1",
    "map": {
      "TXP": "天津西",
      "XHP": "宣化",
      "TJP": "天津"
    }
  },
  "messages": [],
  "validateMessages": {}
}

        /// <summary>
        /// 车票查询数据获取
        /// </summary>
        /// <param name="goTime">出行日期</param>
        /// <param name="fromStationCode">出发站编码</param>
        /// <param name="toStationCode">到达站编码</param>
        /// <param name="errorMsg">错误消息</param>
        /// <returns></returns>
        public TicketSearchJson GetSearchTicketData(DateTime goTime, string fromStationCode, string toStationCode, ref string errorMsg)
        {
            string srcString = string.Empty;
            try
            {
                using (WebClient client = new WebClient())
                {
                    string url = string.Format("https://kyfw.12306.cn/otn/leftTicket/query?leftTicketDTO.train_date={0}&leftTicketDTO.from_station={1}&leftTicketDTO.to_station={2}&purpose_codes=ADULT",
                        goTime.ToString("yyyy-MM-dd"), fromStationCode, toStationCode);
                    Uri uri = new Uri(url);
                    ServicePointManager.ServerCertificateValidationCallback = ValidateServerCertificate;
                    byte[] responseData = client.DownloadData(uri);
                    srcString = Encoding.UTF8.GetString(responseData);
                    TicketSearchJson ticketSearch = JsonConvert.DeserializeObject<TicketSearchJson>(srcString);
                    return ticketSearch;
                }
            }
            catch (Exception ex)
            {
                errorMsg = ex.Message;
                return null;
            }
        }

        /// <summary>
        /// 服务器证书回调方法
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="certificate"></param>
        /// <param name="chain"></param>
        /// <param name="sslPolicyErrors"></param>
        /// <returns></returns>
        private bool ValidateServerCertificate(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
        {
            return true;
        }