/// <summary>

        /// 调用对方Url，Post上传数据

        /// </summary>

        /// <param name="postData"></param>

        /// <param name="url"></param>

        /// <returns></returns>

        public static string PostData(string postData)

        {

            //string url = ConfigurationManager.AppSettings["YuTaiUrl"];

            string url = "对方url地址";

            string respStr = string.Empty;

            using (WebClient client = new WebClient())

            {

                var data = Encoding.UTF8.GetBytes((string)postData);

                var response = client.UploadData(url, data);

                respStr = Encoding.UTF8.GetString(response);

            }

            return respStr;

        }

 public static string Post(string jsonParas)

        {

            //string strURL = Url + "/" + methodName;

            string strURL = "对方url地址";

            //创建一个HTTP请求

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(strURL);

            //Post请求方式

            request.Method = "POST";

            //内容类型

            request.ContentType = "application/x-www-form-urlencoded";

            //request.ContentType = "text/html";

            //设置参数，并进行URL编码

            //虽然我们需要传递给服务器端的实际参数是JsonParas(格式：[{\"UserID\":\"0206001\",\"UserName\":\"ceshi\"}])，

            //但是需要将该字符串参数构造成键值对的形式（注："paramaters=[{\"UserID\":\"0206001\",\"UserName\":\"ceshi\"}]"），

            //其中键paramaters为WebService接口函数的参数名，值为经过序列化的Json数据字符串

            //最后将字符串参数进行Url编码

            string paraUrlCoded = System.Web.HttpUtility.UrlEncode("paramaters");

            paraUrlCoded += "=" + System.Web.HttpUtility.UrlEncode(jsonParas);

            byte[] payload;

            //将Json字符串转化为字节

            payload = System.Text.Encoding.UTF8.GetBytes(paraUrlCoded);

            //设置请求的ContentLength

            request.ContentLength = payload.Length;

            //发送请求，获得请求流  

            Stream writer;

            try

            {

                writer = request.GetRequestStream();//获取用于写入请求数据的Stream对象

            }

            catch (Exception)

            {

                writer = null;

                Console.Write("连接服务器失败!");

            }

            //将请求参数写入流

            writer.Write(payload, , payload.Length);

            writer.Close();//关闭请求流

            String strValue = "";//strValue为http响应所返回的字符流

            HttpWebResponse response;

            try

            {

                //获得响应流

                response = (HttpWebResponse)request.GetResponse();

            }

            catch (WebException ex)

            {

                response = ex.Response as HttpWebResponse;

            }

            Stream s = response.GetResponseStream();

            //服务器端返回的是一个XML格式的字符串，XML的Content才是我们所需要的Json数据

            XmlTextReader Reader = new XmlTextReader(s);

            Reader.MoveToContent();

            strValue = Reader.ReadInnerXml();//取出Content中的Json数据

            Reader.Close();

            s.Close();

            return strValue;//返回Json数据

        }

        /// <summary>

        /// POST请求接口调用

        /// </summary>

        /// <param name="url"></param>

        /// <param name="param"></param>

        /// <returns></returns>

        public static string PostMoths(string url, string param)

        {

            string strURL = url;

            System.Net.HttpWebRequest request;

            request = (System.Net.HttpWebRequest)WebRequest.Create(strURL);

            request.Method = "POST";

            request.ContentType = "application/json;charset=UTF-8";

            string paraUrlCoded = param;

            byte[] payload;

            payload = System.Text.Encoding.UTF8.GetBytes(paraUrlCoded);

            request.ContentLength = payload.Length;

            Stream writer = request.GetRequestStream();

            writer.Write(payload, , payload.Length);

            writer.Close();

            System.Net.HttpWebResponse response;

            response = (System.Net.HttpWebResponse)request.GetResponse();

            System.IO.Stream s;

            s = response.GetResponseStream();

            string StrDate = "";

            string strValue = "";

            StreamReader Reader = new StreamReader(s, Encoding.UTF8);

            while ((StrDate = Reader.ReadLine()) != null)

            {

                strValue += StrDate + "\r\n";

            }

            return strValue;

        }