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在实际编程中，可能需要读取特定网页的信息，但很多网站需要用户登录后，才能够获取相关的页面内容，这就需要编程者先临时存储当前的cookie，
在C#中可以使用CookieContainer 对象来保存登录后的Cookie信息，这样，在每次发送数据的时候，附加上Cookie信息，就可以了。
#region 同步通过POST方式发送数据 /// <summary> /// 通过POST方式发送数据 /// </summary> /// <param name="Url">url</param> /// <param name="postDataStr">Post数据</param> /// <param name="cookie">Cookie容器</param> /// <returns></returns> public string SendDataByPost(string Url,string postDataStr,ref CookieContainer cookie) { HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url); if (cookie.Count == 0) { request.CookieContainer = new CookieContainer(); cookie = request.CookieContainer; } else { request.CookieContainer = cookie; } request.Method = "POST"; request.ContentType = "application/x-www-form-urlencoded"; request.ContentLength = postDataStr.Length; Stream myRequestStream = request.GetRequestStream(); StreamWriter myStreamWriter = new StreamWriter(myRequestStream, Encoding.GetEncoding("gb2312")); myStreamWriter.Write(postDataStr); myStreamWriter.Close(); HttpWebResponse response = (HttpWebResponse)request.GetResponse(); Stream myResponseStream = response.GetResponseStream(); StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8")); string retString= myStreamReader.ReadToEnd(); myStreamReader.Close(); myResponseStream.Close(); return retString; } #endregion #region 同步通过GET方式发送数据 /// <summary> /// 通过GET方式发送数据 /// </summary> /// <param name="Url">url</param> /// <param name="postDataStr">GET数据</param> /// <param name="cookie">GET容器</param> /// <returns></returns> public string SendDataByGET(string Url, string postDataStr, ref CookieContainer cookie) { HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url +( postDataStr == "" ? "" : "?") + postDataStr); if (cookie.Count == 0) { request.CookieContainer = new CookieContainer(); cookie = request.CookieContainer; } else { request.CookieContainer = cookie; } request.Method = "GET"; request.ContentType = "text/html;charset=UTF-8"; HttpWebResponse response = (HttpWebResponse)request.GetResponse(); Stream myResponseStream = response.GetResponseStream(); StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8")); string retString = myStreamReader.ReadToEnd(); myStreamReader.Close(); myResponseStream.Close(); return retString; } #endregion 操作代码 CookieContainer cc=new CookieContainer(); cc.Add(new System.Uri("http://www.baidu.com "), new Cookie("PHPSESSID", "xx")); string content = web.SendDataByGET("http://www.baidu.com/xx/yy.php","","gbk",ref cc); MessageBox.Show(content);
C#带cookie Post和Get方式发送数据，保持cookie
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原文地址：http://www.cnblogs.com/test404/p/5937213.html
