转载：通过POST和GET来获取数据

using System.Web;        /// <summary>        /// Post方式请求页面        /// </summary>        /// <param name="url">地址</param>        /// <param name="postData">post数据</param>        /// <returns>响应</returns>        private HttpWebResponse RequestbyPost(string url, string postData)        {            Uri lcUri = new Uri(url);            HttpWebRequest loHttp = (HttpWebRequest)WebRequest.Create(lcUri);            //string lcPostData = HttpUtility.UrlEncode(postData, System.Text.Encoding.Default);            string lcPostData = postData;            loHttp.Method = "POST";            loHttp.ContentType = "application/x-www-form-urlencoded";            loHttp.KeepAlive = true;            byte[] lbPostBuffer = System.Text.Encoding.Default                .GetBytes(lcPostData);            loHttp.ContentLength = lbPostBuffer.Length;            Stream loPostData = loHttp.GetRequestStream();            loPostData.Write(lbPostBuffer, 0, lbPostBuffer.Length);            loPostData.Close();            return (HttpWebResponse)loHttp.GetResponse();        }        /// <summary>        /// Post方式请求页面        /// </summary>        /// <param name="url">地址</param>        /// <param name="postData">post数据</param>        /// <returns>响应</returns>        private HttpWebResponse RequestbyPost(string url, string postData, string cookieHeader)        {            Uri lcUri = new Uri(url);            HttpWebRequest loHttp = (HttpWebRequest)WebRequest.Create(lcUri);            //string lcPostData = HttpUtility.UrlEncode(postData, System.Text.Encoding.Default);            string lcPostData = postData;            loHttp.Method = "POST";            loHttp.ContentType = "application/x-www-form-urlencoded";            CookieContainer cookie1 = new CookieContainer();            loHttp.CookieContainer = cookie1;            loHttp.CookieContainer.SetCookies(lcUri, cookieHeader);            loHttp.KeepAlive = true;            byte[] lbPostBuffer = System.Text.Encoding.Default                .GetBytes(lcPostData);            loHttp.ContentLength = lbPostBuffer.Length;            Stream loPostData = loHttp.GetRequestStream();            loPostData.Write(lbPostBuffer, 0, lbPostBuffer.Length);            loPostData.Close();            return (HttpWebResponse)loHttp.GetResponse();        }        /// <summary>        /// Get方式请求页面        /// </summary>        /// <param name="url">地址</param>        /// <returns>响应</returns>        private HttpWebResponse RequestbyGet(string url)        {            Uri lcUri = new Uri(url);            HttpWebRequest loHttp = (HttpWebRequest)WebRequest.Create(lcUri);            loHttp.Method = "GET";            //loHttp.ContentType = "application/x-www-form-urlencoded";            return (HttpWebResponse)loHttp.GetResponse();        }        /// <summary>        /// Get方式请求页面        /// </summary>        /// <param name="url">地址</param>        /// <param name="cookieHeader">cookieHeader</param>        /// <returns>响应</returns>        private HttpWebResponse RequestbyGet(string url, out string cookieHeader)        {            Uri lcUri = new Uri(url);            HttpWebRequest loHttp = (HttpWebRequest)WebRequest.Create(lcUri);            loHttp.Method = "GET";            //loHttp.ContentType = "application/x-www-form-urlencoded";            loHttp.AllowAutoRedirect = true;            loHttp.CookieContainer = new CookieContainer();            loHttp.KeepAlive = true;            HttpWebResponse httpWebResponse = (HttpWebResponse)loHttp.GetResponse();            cookieHeader = loHttp.CookieContainer.GetCookieHeader(lcUri);            return httpWebResponse;        }