C# Post提交数据

        /// <summary>

        /// Post提交数据

        /// </summary>

        /// <param name="postUrl">URL</param>

        /// <param name="paramData">参数</param>

        /// <returns></returns>

        private string PostWebRequest(string postUrl, string paramData)

        {

            string ret = string.Empty;

            try

            {

                if (!postUrl.StartsWith("http://"))

                    return "";

                byte[] byteArray = Encoding.Default.GetBytes(paramData); //转化

                HttpWebRequest webReq = (HttpWebRequest)WebRequest.Create(new Uri(postUrl));

                webReq.Method = "POST";

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

                webReq.ContentLength = byteArray.Length;

                Stream newStream = webReq.GetRequestStream();

                newStream.Write(byteArray, 0, byteArray.Length);//写入参数

                newStream.Close();

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

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

                ret = sr.ReadToEnd();

                sr.Close();

                response.Close();

                newStream.Close();

            }

            catch (Exception ex)

            {

               return ex.Message;

            }

            return ret;

        }