[HttpPost]
        public ActionResult index(decimal amount)
        {
            //生成订单10位序列号，此处用时间和随机数生成，商户根据自己调整，保证唯一
            string order_no = DateTime.Now.ToString("yyyyMMddHHmmss") + TenpayUtil.BuildRandomStr(4);
            //这里是数据操作，代码已删除


            ViewData["weixin_pay_qr_code"] = string.Format("/get_qrcode?product_id={0}", order_no);
            return View();
        }

        public void get_qrcode(string product_id)
        {
            WxPayHelper helper = new WxPayHelper();
            Dictionary<string, string> dic = new Dictionary<string, string>();
            dic.Add("appid", config_util.mp_weixin_appid);
            dic.Add("mch_id", config_util.weixin_mch_id);
            dic.Add("nonce_str", TenpayUtil.getNoncestr());
            dic.Add("product_id", product_id);
            dic.Add("time_stamp", TenpayUtil.getTimestamp());
            dic.Add("sign", helper.GetSign(dic));
            string url = WxPayHelper.FormatBizQueryParaMap(dic, false);//这里不要url编码

            string code = "weixin://wxpay/bizpayurl?" + url;
            var qrc = Create_ImgCode(code, 6);
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            qrc.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);
            byte[] bytes = ms.GetBuffer();  //byte[]   bytes=   ms.ToArray(); 这两句都可以，至于区别么，下面有解释
            ms.Close();


            Response.BinaryWrite(bytes);
            return;
        }

        public ContentResult index()
        {
            
            if (Request.RequestType == "POST")
            {
                try
                {
                    WxPayHelper helper = new WxPayHelper();
                    StreamReader reader = new StreamReader(Request.InputStream);
                    String xmlData = reader.ReadToEnd();
                    helper.ReceivePostXmlData(xmlData);
                    common_util.WriteLog("接收post来的xmlData=" + xmlData);
                    if (helper.CheckSign())
                    {
                        common_util.WriteLog("签名验证通过");
                        string product_id = helper.GetProductId();
                        common_util.WriteLog("产品id=" + product_id);
                        string order_no = product_id;if (产品ID存在)
                        {
                            #region 业务处理
                            helper.SetParameter("body", "用户充值，用户号：" + item.user_id);
                            helper.SetParameter("out_trade_no", order_no);
                            helper.SetParameter("total_fee", (item.amount * 100).ToString("#"));//这里单位是分
                            helper.SetParameter("notify_url", "http//www.openweixin.com.cn/notify");
                            helper.SetParameter("trade_type", "NATIVE");
                            string prepay_id = helper.GetPrepayId();
                            common_util.WriteLog("prepay_id=" + prepay_id);
                            if (!string.IsNullOrEmpty(prepay_id))
                            {
                                helper.SetReturnParameter("return_code", "SUCCESS");
                                helper.SetReturnParameter("result_code", "SUCCESS");
                                helper.SetReturnParameter("prepay_id", prepay_id);
                                helper.SetReturnParameter("appid", helper.GetAppId);
                                helper.SetReturnParameter("mch_id", helper.GetMch_Id);
                                helper.SetReturnParameter("nonce_str", TenpayUtil.getNoncestr());
                            }
                            else
                            {
                                helper.SetReturnParameter("return_code", "SUCCESS");//返回状态码
                                helper.SetReturnParameter("result_code", "FAIL");//业务结果
                                helper.SetReturnParameter("err_code_des", "预订单生产失败");
                            }
                            #endregion
                        }
                        else
                        {
                            helper.SetReturnParameter("return_code", "SUCCESS");//返回状态码
                            helper.SetReturnParameter("result_code", "FAIL");//业务结果
                            helper.SetReturnParameter("err_code_des", "此商品无效");//业务结果
                        }
                    }
                    else
                    {
                        helper.SetReturnParameter("return_code", "FAIL");
                        helper.SetReturnParameter("return_msg", "签名失败");
                        common_util.WriteLog("签名验证没有通过");
                    }
                    string xmlStr = helper.GetReturnXml();
                    common_util.WriteLog("返回xml=" + xmlStr);
                    Response.ContentType = "text/xml";
                    Response.Clear();
                    Response.Write(xmlStr);
                    Response.End();
                }
                catch (Exception ex)
                {
                    common_util.WriteLog("异常了" + ex);
                }
            }
            return Content("OK");
        }

            if (Request.RequestType == "POST")
            {
                try
                {
                    WxPayHelper helper = new WxPayHelper();
                    StreamReader reader = new StreamReader(Request.InputStream);
                    String xmlData = reader.ReadToEnd();
                    helper.ReceivePostXmlData(xmlData);
                    common_util.WriteLog("Notify_接收post来的xmlData=" + xmlData);
                    if (helper.CheckSign())
                    {
                        Dictionary<string, string> dicBack = helper.GetParameter();//获取所有参数
                        if (dicBack != null && dicBack.Keys.Contains("return_code"))
                        {
                            if (dicBack["return_code"] == "SUCCESS")
                            {
                                common_util.WriteLog("return_code=SUCCESS");
                                if (dicBack["result_code"] == "SUCCESS")
                                {
                                    common_util.WriteLog("result_code=SUCCESS");
                                    string out_trade_no = dicBack["out_trade_no"];//商户订单号
                                    common_util.WriteLog("out_trade_no=" + out_trade_no);

                                    //1.验证商户订单号是否被处理
                                    //2.处理过直接返回成功，否则返回
                                    //此处根据out_trade_no 处理业务数据
                                    //处理业务数据结束

                                    common_util.WriteLog("Notify_验证签名成功");
                                    helper.SetReturnParameter("return_code", "SUCCESS");
                                    helper.SetReturnParameter("return_msg", "");
                                }
                            }
                            if (dicBack["return_code"] == "FAIL")
                            {
                                common_util.WriteLog("Notify_验证签名成功");
                                helper.SetReturnParameter("return_code", "SUCCESS");
                                helper.SetReturnParameter("return_msg", dicBack["return_msg"]);
                            }
                        }
                    }
                    else
                    {
                        common_util.WriteLog("Notify_验证签名失败");
                        helper.SetReturnParameter("return_code", "FAIL");
                        helper.SetReturnParameter("return_msg", "签名失败");
                    }
                    string xmlStr = helper.GetReturnXml();
                    common_util.WriteLog("Notify_返回xml=" + xmlStr);
                    Response.ContentType = "text/xml";
                    Response.Clear();
                    Response.Write(xmlStr);
                    Response.End();
                }
                catch (Exception ex)
                {
                    common_util.WriteLog("Notify_异常了" + ex);
                }
            }
            return Content("OK");