使用post向webservice发送请求，并且返回值

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注意，这个方法仅仅适用于:该post页面处于websercive 站点下，或者是与webservice同属于一个主站点，即在iis里属于同一主站点的同级虚拟目录。

 protected void btnSynData_Click(object sender, EventArgs e)

        {

string wsUrl = "http://127.0.0.1:1113/yingxiao/clfbxd.asmx/huixie";

//注意：huixie 是webservice的方法名

  string postData = "我是谁";

    HttpConnectToServer(wsUrl, postData);

}

 /// <summary>

        /// 发送消息到ws服务器

        /// </summary>

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

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

        /// <returns></returns>

        public string HttpConnectToServer(string ServerPage, string strXml)

        {

            string postData = "strXml=" + strXml;

            byte[] dataArray = Encoding.Default.GetBytes(postData);

            //创建请求

            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(ServerPage);

            request.Credentials = CredentialCache.DefaultCredentials;

            request.CookieContainer = new CookieContainer();

            request.Method = "POST";

            request.ContentLength = dataArray.Length;

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

            //创建输入流

            Stream dataStream = null;

            try

            {

                dataStream = request.GetRequestStream();

            }

            catch (Exception)

            {

                return null;//连接服务器失败

            }

            //发送请求

            dataStream.Write(dataArray, , dataArray.Length);

            dataStream.Close();

            //读取返回消息

            string res = string.Empty;

            try

            {

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

                StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);

                res = reader.ReadToEnd();

                reader.Close();

            }

            catch (Exception ex)

            {

                throw new Exception(ex.Message);

            }

            return res;

        }