The use of Alipay's payment interface in .net

using Aop.Api;
using Aop.Api.Request;
using Aop.Api.Response;
using Aop.Api.Util;

 static string serverUrl = "https://openapi.alipaydev.com/gateway.do";
    static string app_id = "**";  //开发者的应用ID
    static string format = "JSON";
    static string charset = "utf-8";
    static string sign_type = "RSA2"; //签名格式
    static string version = "1.0";
    string UID = "2088102169707816";//卖家支付宝账户号
    //商户私钥
    static string merchant_private_key = "***";
    //支付宝公钥
    static string alipay_public_key = "***";

public string H5RequestPayWay(OrderPO order)
    {
      IAopClient client = new DefaultAopClient(serverUrl, app_id, merchant_private_key, format, version, sign_type, alipay_public_key, charset, false);
      AlipayTradeWapPayRequest request = new AlipayTradeWapPayRequest();
      string address= "http://m." + PathLogic1.RootDomain;
      request.SetReturnUrl(address+ "/WebPay/AlipayPayResult");//同步请求
      request.SetNotifyUrl(address + "/WebPay/AsyncPay");//异步请求
      var lstDetail = Context.Data.OrderDetail.Where(x => x.OrderNo == order.OrderNo).ToSelectList(x=>new { x.SkuName});
      StringBuilder sb = new StringBuilder();
      for (int i = 0; i < lstDetail.Count(); i++)
      {
        sb.Append(lstDetail[i].SkuName + ",");
      }
      request.BizContent = "{" +
  "\"body\":\""+sb.ToString().Substring(0,sb.Length-1)+"\"," +
  "\"subject\":\"袋鼠巴巴商品支付\"," +
  "\"out_trade_no\":\""+order.OrderNo+"\"," +
  "\"timeout_express\":\"90m\"," +
  "\"total_amount\":"+(order.TotalAmount.Value+order.TotalFreight.Value)+"," +
  "\"product_code\":\"QUICK_WAP_PAY\"" +
  " }";

      AlipayTradeWapPayResponse response = client.pageExecute(request);
       return response.Body;
    }

public ActionResult AlipayPayResult()
    {
      ViewBag.result = "success";
      return View("PayResult");
    }

     /// <summary>
    /// 验证通知数据的正确性
    /// </summary>
    /// <param name="out_trade_no"></param>
    /// <param name="total_amount"></param>
    /// <param name="seller_id"></param>
    /// <returns></returns> 
private SortedDictionary<string, string> GetRequestPost()
    {
      int i = 0;
      SortedDictionary<string, string> sArray = new SortedDictionary<string, string>();
      NameValueCollection coll;
      //Load Form variables into NameValueCollection variable.
      coll = Request.Form;

      // Get names of all forms into a string array.
      String[] requestItem = coll.AllKeys;

      for (i = 0; i < requestItem.Length; i++)
      {
        sArray.Add(requestItem[i], Request.Form[requestItem[i]]);
      }

      return sArray;
    }

 /// <summary>
    /// 验签
    /// </summary>
    /// <param name="inputPara"></param>
    /// <returns></returns>
    public Boolean Verify(SortedDictionary<string, string> inputPara)
    {
      Dictionary<string, string> sPara = new Dictionary<string, string>();    
      Boolean verifyResult = AlipaySignature.RSACheckV1(inputPara, alipay_public_key, charset,sign_type,false);
      return verifyResult;
    }

 [HttpPost]
    public void AsyncPay()
    {
      SortedDictionary<string, string> sPara = GetRequestPost();//将post请求过来的参数传化为SortedDictionary
      if (sPara.Count > 0)
      {
        AlipayTradeWayPayServer pay = new AlipayTradeWayPayServer();
        Boolean VerifyResult = pay.Verify(sPara);//验签if (VerifyResult)
        {
          try
          {
             //商户订单号
            string out_trade_no = Request.Form["out_trade_no"];
            //支付宝交易号
            string trade_no = Request.Form["trade_no"];
            //支付金额
            decimal total_amount = Request.Form["total_amount"].ConvertType(Decimal.Zero);
            //实收金额
            //decimal receipt_amount = Request.Form["receipt_amount"].ConvertType(Decimal.Zero);
            //交易状态
            string trade_status = Request.Form["trade_status"];
            //卖家支付宝账号
            string seller_id = Request.Form["seller_id"];

            //商品描述
            string body = Request.Form["body"];
            //交易创建时间
            DateTime gmt_create = DateTime.Parse(Request.Form["gmt_create"]);
            //交易付款时间
            DateTime gmt_payment = DateTime.Parse(Request.Form["gmt_payment"]);
            string appid = Request.Form["app_id"];
            WriteError("验证参数开始");
            Boolean DataValidity = pay.CheckInform(out_trade_no, total_amount, seller_id, appid);//商家判断参数时候是否匹配if (DataValidity)
            {
              if (Request.Form["trade_status"] == "TRADE_FINISHED")
              {
                AlipayWayPayPO model = CreateAlipayWayPay(out_trade_no, trade_no, trade_status, gmt_create, gmt_payment);
                pay.PaySuccess(out_trade_no, model, Server.MapPath("~/" + DateTime.Today.ToString("yyMMdd") + ".txt"));//修改订单
                //注意：
                //退款日期超过可退款期限后（如三个月可退款），支付宝系统发送该交易状态通知
              }
              else if (Request.Form["trade_status"] == "TRADE_SUCCESS")
              {
                AlipayWayPayPO model = CreateAlipayWayPay(out_trade_no, trade_no, trade_status, gmt_create, gmt_payment);
                pay.PaySuccess(out_trade_no, model, Server.MapPath("~/" + DateTime.Today.ToString("yyMMdd") + ".txt"));//修改订单
                //注意：
                //付款完成后，支付宝系统发送该交易状态通知
              }
              else
              {

              }

              //——请根据您的业务逻辑来编写程序（以上代码仅作参考）——

              Response.Write("success"); //请不要修改或删除

              /////////////////////////////////////////////////////////////////////////////////////////////////////////////
            }
          }
          catch (Exception ex)
          {
            
          }
        }
        else//验证失败
        {
          Response.Write("fail");
        }
      }
      else
      {
        Response.Write("无通知参数");
      }
    }