string url="";string param="";string result = string.Empty;HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url);Encoding encoding = Encoding.UTF8;byte[] bs = Encoding.UTF8.GetBytes(param);string responseData = String.Empty;req.Method = "Post";req.Accept = "application/json, text/javascript, */*; q=0.01";req.ContentType = "application/json; charset=UTF-8";using (Stream reqStream = req.GetRequestStream()){ ???reqStream.Write(bs, 0, bs.Length); ???reqStream.Close();}using (HttpWebResponse response = (HttpWebResponse)req.GetResponse()){ ???using (StreamReader reader = new StreamReader(response.GetResponseStream(), encoding)) ???{ ???????responseData = reader.ReadToEnd().ToString(); ???} ???result = responseData;}POST请求——HttpWebRequest
原文地址：http://www.cnblogs.com/Lulus/p/7872354.html