//组合xml内容 StringBuilder strBuilder = new StringBuilder(); var par= @"<xml> <appid>wx2421b1c4370ec43b</appid> <attach>支付测试</attach> <body>H5支付测试</body> <mch_id>10000100</mch_id> <nonce_str>1add1a30ac87aa2db72f57a2375d8fec</nonce_str> <notify_url>http://wxpay.wxutil.com/pub_v2/pay/notify.v2.php</notify_url> <openid>oUpF8uMuAJO_M2pxb1Q9zNjWeS6o</openid> <out_trade_no>1415659990</out_trade_no> <spbill_create_ip>14.23.150.211</spbill_create_ip> <total_fee>1</total_fee> <trade_type>MWEB</trade_type> <scene_info>{""h5_info"": {""type"":""IOS"",""app_name"": ""王者荣耀"",""package_name"": ""com.tencent.tmgp.sgame""}}</scene_info> <sign>0CB01533B8C1EF103065174F50BCA001</sign> </xml> "; strBuilder.Append(par); string data = strBuilder.ToString(); //进行utf-8编码 var encoding = Encoding.GetEncoding("utf-8"); byte[] buffer = encoding.GetBytes(data); //根据webURL创建HttpWebRequest对象 HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url); request.Method = "post"; //request.Headers.Add("charset:utf-8"); request.ContentLength = buffer.Length; request.ContentType = "text/xml"; StreamWriter myWriter = null; try { myWriter = new StreamWriter(request.GetRequestStream()); myWriter.Write(data); } catch (Exception e) { Console.WriteLine(e.Message); } finally { myWriter.Close(); } //读取服务器返回的信息 HttpWebResponse objResponse = (HttpWebResponse)request.GetResponse(); using (StreamReader sr = new StreamReader(objResponse.GetResponseStream())) { string result = string.Empty; result = sr.ReadToEnd(); Console.WriteLine(result); var resultStr = XElement.Parse("result"); var result_code = resultStr.Element("return_code").Value; var result_msg = resultStr.Element("return_msg").Value; }