.Net提交POST

 

        #region Post到url
        ///<summary>
        /// Post data到url
        ///</summary>
        ///<param name="data">要post的数据</param>
        ///<param name="url">目标url</param>
        ///<returns>服务器响应</returns>
         public static string PostDataToUrl(string data, string url)
        {
            // Encoding encoding = Encoding.GetEncoding(sRequestEncoding);
            Encoding encoding = Encoding.Default;
            byte[] bytesToPost = encoding.GetBytes(data);
            return PostDataToUrl(bytesToPost, url);
        }

        ///<summary>
        /// Post data到url
        ///</summary>
        ///<param name="data">要post的数据</param>
        ///<param name="url">目标url</param>
        ///<returns>服务器响应</returns>
        public static string PostDataToUrl(byte[] data, string url)
        {
            #region 创建httpWebRequest对象
            WebRequest webRequest = WebRequest.Create(url);
            HttpWebRequest httpRequest = webRequest as HttpWebRequest;
            if (httpRequest == null)
            {
                throw new ApplicationException(string.Format("Invalid url string: {0}", url));
            }
            #endregion

            #region 填充httpWebRequest的基本信息
            httpRequest.UserAgent = sUserAgent;
            httpRequest.ContentType = sContentType;
            //httpRequest.Headers.Add(HttpRequestHeader.ContentEncoding, "utf-8");
            httpRequest.Method = "POST";
            #endregion

            #region 填充要post的内容
            httpRequest.ContentLength = data.Length;
            Stream requestStream = httpRequest.GetRequestStream();
            requestStream.Write(data, 0, data.Length);
            requestStream.Close();
            #endregion

            #region 发送post请求到服务器并读取服务器返回信息
            Stream responseStream;
            try
            {
                responseStream = httpRequest.GetResponse().GetResponseStream();
            }
            catch (Exception e)
            {
                // log error
                Console.WriteLine(
                    string.Format("POST操作发生异常：{0}", e.Message));
                throw e;
            }
            #endregion

            #region 读取服务器返回信息
            string stringResponse = string.Empty;
            //StreamReader responseReader = new StreamReader(responseStream, Encoding.GetEncoding(sResponseEncoding))
            using (StreamReader responseReader = new StreamReader(responseStream, Encoding.Default))
            {
                stringResponse = responseReader.ReadToEnd();
            }
            responseStream.Close();
            #endregion
            return stringResponse;
        }
        const string sUserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";
        const string sContentType = "application/x-www-form-urlencoded";  
        const string sRequestEncoding = "ascii";
        const string sResponseEncoding = "gb2312";
        #endregion