HttpWebRequest request = (HttpWebRequest)WebRequest.Create(postUrl); //--需要封装的参数             request.CookieContainer = new CookieContainer();            CookieContainer cookie = request.CookieContainer;//如果用不到Cookie，删去即可              //以下是发送的http头             request.Referer = "";            request.Accept = "Accept:text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";            request.Headers["Accept-Language"] = "zh-CN,zh;q=0.";            request.Headers["Accept-Charset"] = "GBK,utf-8;q=0.7,*;q=0.3";            request.UserAgent = "User-Agent:Mozilla/5.0 (Windows NT 5.1) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/14.0.835.202 Safari/535.1";            request.KeepAlive = true;            //上面的http头看情况而定，但是下面俩必须加              request.ContentType = "application/x-www-form-urlencoded";            Encoding encoding = Encoding.UTF8;//根据网站的编码自定义            request.Method ="get";  //--需要将get改为post才可行            string postDataStr;            Stream requestStream = request.GetRequestStream();            if (postDatas != "")            {                postDataStr=postDatas;//--需要封装,形式如“arg=arg1&arg2=arg2”                 byte[] postData = http://www.mamicode.com/encoding.GetBytes(postDataStr);//postDataStr即为发送的数据，>