.NET开发微信小程序-接收微信支付回调数据

/// <summary>
        /// 付款返回的数据
        /// </summary>
        /// <returns></returns>
        public string Notify_url()
        {
            String xmlData = getPostStr();
            //保存付款成功过来的数据
            Log4Helper.ErrorInfo("GXL", xmlData);
            WxAPIService.PayResult(xmlData);
            return "SUCCESS";
        }

//获得Post过来的数据  
        public static string getPostStr()
        {
            Int32 intLen = Convert.ToInt32(System.Web.HttpContext.Current.Request.InputStream.Length);
            byte[] b = new byte[intLen];
            System.Web.HttpContext.Current.Request.InputStream.Read(b, 0, intLen);
            return System.Text.Encoding.UTF8.GetString(b);
        }

 /// <summary>
        /// 付款结果处理
        /// </summary>
        public static void PayResult(string ResultMsg)
        {
            if(!string.IsNullOrEmpty(ResultMsg))
            {
                var xml = new XmlDocument();
                xml.LoadXml(ResultMsg);
                //处理返回的值
                DataSet ds = new DataSet();
                StringReader stram = new StringReader(ResultMsg);
                XmlTextReader reader = new XmlTextReader(stram);
                ds.ReadXml(reader);
                string return_code = ds.Tables[0].Rows[0]["return_code"].ToString();
                if (return_code.ToUpper() == "SUCCESS")
                {
                    //通信成功  
                    string result_code = ds.Tables[0].Rows[0]["result_code"].ToString();//业务结果  
                    if (result_code.ToUpper() == "SUCCESS")
                    {
                        string appid = ds.Tables[0].Rows[0]["appid"].ToString();
                        string attach = ds.Tables[0].Rows[0]["attach"].ToString();
                        string mch_id = ds.Tables[0].Rows[0]["mch_id"].ToString();
                        string openid = ds.Tables[0].Rows[0]["openid"].ToString();
                        Int32 total_fee = Convert.ToInt32(ds.Tables[0].Rows[0]["total_fee"].ToString());
                        string transaction_id = ds.Tables[0].Rows[0]["transaction_id"].ToString();
                        Log4Helper.ErrorInfo("GXL", "付款成功:attach:" + attach + ",小程序appID:" + appid + ",商户号:" + mch_id + ",支付人:" + openid + ",付款金额:" + total_fee + ",商户交易号:" + transaction_id);                        
                    }
                    else
                    {
                        Log4Helper.ErrorInfo("GXL", "支付失败:" + ResultMsg);
                    }
                }
                else
                {
                    Log4Helper.ErrorInfo("GXL", "支付失败:" + ResultMsg);
                }
            }
        }