向 Paypal Action 结果添加变量

如何解决向 Paypal Action 结果添加变量

我正在使用 C# 中的 Paypal 交易示例。这个例子有静态项目要发送。我添加了获取正确项目所需的内容，并且我正在使用我没有添加的 id 变量来执行此操作。 id 获取该订单的数据记录。所有这些似乎都运行良好。除了现在它不会重定向到贝宝付款页面。我假设这是因为我添加了 id 变量。 我的问题是如何解决这个问题？我是否需要更改某些内容以使其重定向或不允许添加此变量？它适用于静态项目，没有 id..

下面是我的控制器操作：

public ActionResult ProcessInvoice(int id,string Cancel = null )
    {

        //getting the apiContext  
        APIContext apiContext = PaypalConfiguration.GetAPIContext();
        System.Text.StringBuilder sb = new System.Text.StringBuilder();
        try
        {
            //A resource representing a Payer that funds a payment Payment Method as paypal  
            //Payer Id will be returned when payment proceeds or click to pay  
            string payerId = Request.Params["PayerID"];
            if (string.IsNullOrEmpty(payerId))
            {
                //this section will be executed first because PayerID doesn't exist  
                //it is returned by the create function call of the payment class  
                // Creating a payment  
                // baseURL is the url on which paypal sendsback the data.  
                string baseURI = Request.Url.Scheme + "://" + Request.Url.Authority + "/ProcessInvoice?";
                //here we are generating guid for storing the paymentID received in session  
                //which will be used in the payment execution  
                var guid = Convert.ToString((new Random()).Next(100000));
                //CreatePayment function gives us the payment approval url  
                //on which payer is redirected for paypal account payment  
                var createdPayment = this.CreatePayment(id,apiContext,baseURI + "guid=" + guid);
                //get links returned from paypal in response to Create function call  
                var links = createdPayment.links.GetEnumerator();
                string paypalRedirectUrl = null;
                while (links.MoveNext())
                {
                    Links lnk = links.Current;
                    if (lnk.rel.ToLower().Trim().Equals("approval_url"))
                    {
                        //saving the payapalredirect URL to which user will be redirected for payment  
                        paypalRedirectUrl = lnk.href;
                    }
                }
                // saving the paymentID in the key guid  
                Session.Add(guid,createdPayment.id);
                return Redirect(paypalRedirectUrl);
            }
            else
            {
                // This function exectues after receving all parameters for the payment  
                var guid = Request.Params["guid"];
                var executedPayment = ExecutePayment(apiContext,payerId,Session[guid] as string);
                //If executed payment failed then we will show payment failure message to user  
                if (executedPayment.state.ToLower() != "approved")
                {
                    return View("FailureView");
                }
            }
        }
        catch (Exception ex)
        {
            sb.Append("Error :" + ex.Message);
            //return View("FailureView");
        }
        //on successful payment,show success page to user.  
        return View("SuccessView");
    }
    private PayPal.Api.Payment payment;
    private Payment ExecutePayment(APIContext apiContext,string payerId,string paymentId)
    {
        var paymentExecution = new PaymentExecution()
        {
            payer_id = payerId
        };
        this.payment = new Payment()
        {
            id = paymentId
        };
        return this.payment.Execute(apiContext,paymentExecution);
    }
    private Payment CreatePayment(int id,APIContext apiContext,string redirectUrl)
    {
        //create itemlist and add item objects to it 
        var order = db.Orders.Find(id);
        var company = db.CompanyNames.Where(x => x.CompanyId == order.CompanyId).FirstOrDefault();
        var shipping = db.ShippingOrBOL.Where(x => x.CompanyId == order.CompanyId).FirstOrDefault();

        var cName = company.CompanyName;
        var invNum = order.InvoiceNumber;
        var desc = order.OrderDescription;
        var price = order.TotalPrice.ToString();
        var poNum = order.PONumber;
        var shipCost = shipping.ShippingPrice.ToString();
        decimal totalOrder = 0m;
        string total = totalOrder.ToString();
        decimal tax = .08m;
        var detail = db.OrderDetails.Where(x => x.OrderId == id).ToList();
        List<Item> items = new List<Item>();
        foreach (var item in detail)
        {
            var part = db.ExtParts.Where(a => a.Material == item.Material).FirstOrDefault();
            var prt = part.PartNumber;
            var prc = item.UnitPrice.ToString();
            var qty = item.Quantity.ToString();

            items.Add(new Item()
            {
                name = part.Description,currency = "USD",price = prc,quantity = qty,sku = prt,});

            totalOrder += (item.Quantity * item.UnitPrice);
        }
        ItemList theItemList = new ItemList
        {
            items = new List<Item>()
        };
        theItemList.items = items;

        var payer = new Payer()
        {
            payment_method = "paypal"
        };
        // Configure Redirect Urls here with RedirectUrls object  
        var redirUrls = new RedirectUrls()
        {
            cancel_url = redirectUrl + "&Cancel=true",return_url = redirectUrl
        };
        // Adding Tax,shipping and Subtotal details  
        decimal totalTax = totalOrder * (tax);
        var tt = totalTax.ToString();
        var details = new Details()
        {
            tax = tt,shipping = shipCost,subtotal = total
        };
        //Final amount with details  
        var amount = new Amount()
        {
            currency = "USD",total = price,// Total must be equal to sum of tax,shipping and subtotal.  
            details = details
        };
        var transactionList = new List<Transaction>();
        // Adding description about the transaction  
        transactionList.Add(new Transaction()
        {
            description = desc,invoice_number = invNum,//Generate an Invoice No  
            amount = amount,item_list = theItemList
        });
        this.payment = new Payment()
        {
            intent = "sale",payer = payer,transactions = transactionList,redirect_urls = redirUrls
        };
        // Create a payment using a APIContext  
        return this.payment.Create(apiContext);
    }

它实际上转到了用于操作的页面，当然由于该视图不存在而出错。

更新： 问题实际上是总计为 0，Paypal 无法创建总计为零的值。我需要弄清楚为什么总数是 0。我怀疑这是我得到总数的方式。