C# 微信支付回调验签处理的实现

   #region  WeiXin APP
                    // Log.Info(this.GetType().ToString(), "Native pay mode 2 url is producing...");
                    WxPayData data = new WxPayData();
                    //data.SetValue("attach", model.Dowhere);//附加数据
                    data.SetValue("body", model.Title);//商品描述
                    data.SetValue("out_trade_no", model.LocalTransationNo);// WxPayApi.GenerateOutTradeNo());//随机字符串
                    data.SetValue("total_fee", Convert.ToInt32(model.Amount * 100));//总金额
                    data.SetValue("time_start", DateTime.Now.ToString("yyyyMMddHHmmss"));//交易起始时间
                    data.SetValue("time_expire", DateTime.Now.AddMinutes(10).ToString("yyyyMMddHHmmss"));//交易结束时间                                                                              //data.SetValue("goods_tag", "goods_tag");//商品标记
                    data.SetValue("trade_type", "APP");//交易类型
                                                       //data.SetValue("product_id", model.ProductId);//商品ID
                    WxPayData r = WxPayApi.UnifiedOrder(data);//调用统一下单接口
                    string prepay_id = r.GetValue("prepay_id").ToString();

                    WxPayData da2 = new WxPayData();
                    da2.SetValue("appid", WxPayConfig.APPID);//公众账号ID
                    da2.SetValue("noncestr", WxPayApi.GenerateNonceStr());//商户号
                    da2.SetValue("package", "Sign=WXPay");//商品描述
                    da2.SetValue("partnerid", WxPayConfig.MCHID);// WxPayApi.GenerateOutTradeNo());//随机字符串
                    da2.SetValue("prepayid", prepay_id);//总金额
                    da2.SetValue("timestamp", WxPayApi.GenerateTimeStamp());//交易起始时间

                    #endregion

  //https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_7

            WxPayData notifyData = (new Com.WeiXin.Notify(this.HttpContext)).GetNotifyData();

            //检查支付结果中transaction_id是否存在
            if (!notifyData.IsSet("transaction_id"))
            {
                //若transaction_id不存在，则立即返回结果给微信支付后台
                WxPayData res = new WxPayData();
                res.SetValue("return_code", "FAIL");
                res.SetValue("return_msg", "支付结果中微信订单号不存在");
                Log.Error(this.GetType().ToString(), "The Pay result is error : " + res.ToXml());
                HttpContext.Response.Write(res.ToXml());
                HttpContext.Response.End();
            }

            string transaction_id = notifyData.GetValue("transaction_id").ToString();

            //查询订单，判断订单真实性
            if (!QueryOrder(transaction_id))
            {
                //若订单查询失败，则立即返回结果给微信支付后台
                WxPayData res = new WxPayData();
                res.SetValue("return_code", "FAIL");
                res.SetValue("return_msg", "订单查询失败");
                Log.Error(this.GetType().ToString(), "Order query failure : " + res.ToXml());
                HttpContext.Response.Write(res.ToXml());
                HttpContext.Response.End();
            }
            //查询订单成功
            else
            {
                WxPayData res = new WxPayData();
                res.SetValue("return_code", "SUCCESS");
                res.SetValue("return_msg", "OK");
                Log.Info(this.GetType().ToString(), "order query success : " + res.ToXml());

                string trade_no = transaction_id;
                string order_no = notifyData.GetValue("out_trade_no").ToString();     //获取订单号
                string total_fee = (Convert.ToInt32(notifyData.GetValue("total_fee").ToString()) / 100.0).ToString();       //获取总金额
                                                                                                                            //notifyData.GetValue("attach").ToString();
                HttpContext.Response.Write(res.ToXml());
                HttpContext.Response.End();

                PaymentBLL pbll = new PaymentBLL();
                bool b = pbll.PayCallback(order_no, total_fee, transaction_id);
            }
        }

        //查询订单
        private bool QueryOrder(string transaction_id)
        {
            WxPayData req = new WxPayData();
            req.SetValue("transaction_id", transaction_id);
            WxPayData res = WxPayApi.OrderQuery(req);
            if (res.GetValue("return_code").ToString() == "SUCCESS" &&
                res.GetValue("result_code").ToString() == "SUCCESS")
            {
                return true;
            }
            else
            {
                return false;
            }
        }
        #endregion