Post/Get

        /// <summary>
        /// post请求
        /// </summary>
        /// <param name="url">地址</param>
        /// <param name="data">数据</param>
        /// <returns>返回响应的数据</returns>
        public string POST(string url, string data)
        {
            string respMsg = string.Empty;
            byte[] postData = Encoding.UTF8.GetBytes(data);
            WebClient webClient = new WebClient();
            webClient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
            try
            {
                byte[] responseData = webClient.UploadData(url, "POST", postData);
                respMsg = Encoding.UTF8.GetString(responseData);
            }
            catch (WebException web_Error)
            {
                respMsg += "ERROR:" + web_Error.StackTrace + web_Error.Message;
            }
            catch (Exception e)
            {
                respMsg += "ERROR:" + e.StackTrace + e.Message;
            }

            return respMsg;
        }