public static string PostWebRequest2()

        {

            HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create("http://183.66.231.18:8184/api/services/app/ChildSystem/checkLogin");//这是你要提交的url

            Encoding encoding = Encoding.UTF8;

            IDictionary<string, string> para = new Dictionary<string, string>();

            para.Add("ticket", "22d0a6a46bbdf44ec718f600b012b261");

            StringBuilder buffer = new StringBuilder();//这是要提交的数据

            int i = ;

            foreach (string key in para.Keys)

            {

                if (i > )

                {

                    buffer.AppendFormat("&{0}={1}", key, para[key]);

                }

                else

                {

                    buffer.AppendFormat("{0}={1}", key, para[key]);

                }

                i++;

            }

            byte[] bs = Encoding.UTF8.GetBytes(buffer.ToString());//UTF-8

            string responseData = String.Empty;

            req.Method = "POST";

            req.ContentType = "application/x-www-form-urlencoded;charset=utf-8";

            req.ContentLength = bs.Length;

            using (Stream reqStream = req.GetRequestStream())

            {

                reqStream.Write(bs, , bs.Length);

                reqStream.Close();

            }

            using (HttpWebResponse response = (HttpWebResponse)req.GetResponse())

            {

                using (StreamReader reader = new StreamReader(response.GetResponseStream(), encoding))

                {

                    responseData = reader.ReadToEnd().ToString();

                    return responseData;

                }

            }

        }