<![CDATA[解析 XML 出错 (位置: /body): <unspecified file>(1): expected <]]> 微信支付统一下单

private static string sendPost2(string URL, string urlArgs)
        { 
            System.Net.WebClient wCient = new System.Net.WebClient();
            wCient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
            byte[] postData = System.Text.Encoding.ASCII.GetBytes("body=" + urlArgs);
            byte[] responseData = wCient.UploadData(URL, "POST", postData);
            string returnStr = System.Text.Encoding.UTF8.GetString(responseData);//返回接受的数据
            return returnStr;
        }

public static string sendPost(string url, string content)
        {
            string result = "";
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
            req.Method = "POST";
            req.ContentType = "application/x-www-form-urlencoded";
            #region 添加Post 参数
            byte[] data = Encoding.UTF8.GetBytes(content);
            req.ContentLength = data.Length;
            using (Stream reqStream = req.GetRequestStream())
            {
                reqStream.Write(data, 0, data.Length);
                reqStream.Close();
            }
            #endregion
            HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
            Stream stream = resp.GetResponseStream();
            //获取响应内容
            using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
            {
                result = reader.ReadToEnd();
            }
            return result;
        }