我在調用SetExpressCheckout方法時沒有將對象引用設置爲對象的實例

Question

我一直面對這個問題很久，我真的需要幫助。我試圖調用PayPal SetExpressCheckout方法。但是我在第一行發現錯誤。我已經檢查了所有必填字段，並且我確定我沒有在必填字段中傳遞任何空值。我有一個PayPal開發人員帳戶，其API憑據正在使用中。

[/ /配置映射包含簽名憑據和其他所需的配置。 //有關配置參數的完整列表，請參閱在維基頁面 // [https://github.com/paypal/sdk-core-dotnet/wiki/SDK-Configuration-Parameters]

 // Create the PayPalAPIInterfaceServiceService service object to make the API call 
     PayPalAPIInterfaceServiceService service = new PayPalAPIInterfaceServiceService(configurationMap); 

     SetExpressCheckoutRequestType setExpressCheckoutReq = new SetExpressCheckoutRequestType(); 
     SetExpressCheckoutRequestDetailsType details = new SetExpressCheckoutRequestDetailsType(); 


     // (Optional) Email address of the buyer as entered during checkout. 
     // PayPal uses this value to pre-fill the PayPal membership sign-up portion on the PayPal pages. 
     // Character length and limitations: 127 single-byte alphanumeric characters    
     details.BuyerEmail = buyerEmail; 
     details.ReturnURL = returnUrl; 
     details.CancelURL = cancelUrl; 

     // Fix for release 
     // NOTE: Setting this field overrides the setting you specified in your Merchant Account Profile 
     // Indicates whether or not you require the buyer's shipping address on 
     // file with PayPal be a confirmed address. For digital goods, 
     // this field is required, and you must set it to 0. It is one of the following values: 
     // 0 – You do not require the buyer's shipping address be a confirmed address. 
     // 1 – You require the buyer's shipping address be a confirmed address. 
     // Note: 
     // Setting this field overrides the setting you specified in your Merchant Account Profile. 
     // Character length and limitations: 1 single-byte numeric character 

     details.ReqConfirmShipping = ReqConfirmShipping; 

     // (Optional) Determines whether or not the PayPal pages should 
     //display the shipping address set by you in this SetExpressCheckout request, 
     // not the shipping address on file with PayPal for this buyer. Displaying 
     // the PayPal street address on file does not allow the buyer to edit that address. 
     // It is one of the following values: 
     // 0 – The PayPal pages should not display the shipping address. 
     // 1 – The PayPal pages should display the shipping address. 
     // Character length and limitations: 1 single-byte numeric character 
     details.AddressOverride = addressoverride; 
     details.NoShipping = noShipping; 


     decimal itemTotal = 0.0M; 
     decimal orderTotal = 0.0M; 

     // Cost of item. This field is required when you pass a value for ItemCategory. 
     //Split by | 
     string amountItems = itemAmounts; 

     // Item quantity. This field is required when you pass a value for ItemCategory. 
     // For digital goods (ItemCategory=Digital), this field is required. 
     // Character length and limitations: Any positive integer    
     //Split by | 
     string qtyItems = itemQuantities; 

     // Item name. This field is required when you pass a value for ItemCategory.     
     //Split by | 
     string names = itemNames; 

     List<PaymentDetailsItemType> lineItems = new List<PaymentDetailsItemType>(); 
     if (itemNames.Contains('|')) 
     { 
      string[] INames = itemNames.Split('|'); 
      string[] IQtys = itemQuantities.Split('|'); 
      string[] IAmts = itemAmounts.Split('|'); 

      for (int i = 0; i < INames.Length; i++) 
      { 
       PaymentDetailsItemType item = new PaymentDetailsItemType(); 
       BasicAmountType amt = new BasicAmountType(); 

       // PayPal uses 3-character ISO-4217 codes for specifying currencies in fields and variables. 
       amt.currencyID = (CurrencyCodeType)Enum.Parse(typeof(CurrencyCodeType), currencyCode); 
       amt.value = IAmts[i]; 
       item.Quantity = Convert.ToInt32(Convert.ToDecimal(IQtys[i])); 
       item.Name = INames[i]; 
       item.Amount = amt; 


       // Indicates whether an item is digital or physical. For digital goods, this field is required and must be set to Digital. It is one of the following values: 
       // 1. Digital 
       // 2. Physical 
       // By default its Physical for us 
       item.ItemCategory = ItemCategoryType.PHYSICAL; 
       itemTotal += Convert.ToDecimal(IQtys[i]) * Convert.ToDecimal(IAmts[i]); 
       lineItems.Add(item); 
      } 
     } 
     else 
     { 
      PaymentDetailsItemType item = new PaymentDetailsItemType(); 
      BasicAmountType amt = new BasicAmountType(); 

      // PayPal uses 3-character ISO-4217 codes for specifying currencies in fields and variables. 
      amt.currencyID = (CurrencyCodeType)Enum.Parse(typeof(CurrencyCodeType), currencyCode); 
      amt.value = itemAmounts; 
      item.Quantity = Convert.ToInt32(Convert.ToDecimal(itemQuantities)); 
      item.Name = itemNames; 
      item.Amount = amt; 


      // Indicates whether an item is digital or physical. For digital goods, this field is required and must be set to Digital. It is one of the following values: 
      // 1. Digital 
      // 2. Physical 
      // By default its Physical for us 
      item.ItemCategory = ItemCategoryType.PHYSICAL; 
      itemTotal += Convert.ToDecimal(itemQuantities) * Convert.ToDecimal(itemAmounts); 
      lineItems.Add(item); 
     } 


     // (Optional) Item sales tax. 
     // Note: You must set the currencyID attribute to one of 
     // the 3-character currency codes for any of the supported PayPal currencies. 
     // Character length and limitations: Value is a positive number which cannot exceed $10,000 USD in any currency. 
     // It includes no currency symbol. It must have 2 decimal places, the decimal separator must be a period (.), 
     // and the optional thousands separator must be a comma (,). 
     //if (salesTax != string.Empty) 
     //{ 
     // item.Tax = new BasicAmountType((CurrencyCodeType)Enum.Parse(typeof(CurrencyCodeType), parameters["currencyCode"]), parameters["salesTax"]); 
     //} 

     orderTotal += itemTotal; 

     List<PaymentDetailsType> payDetails = new List<PaymentDetailsType>(); 
     PaymentDetailsType paydtl = new PaymentDetailsType(); 

     // How you want to obtain payment. When implementing parallel payments, 
     // this field is required and must be set to Order. 
     // When implementing digital goods, this field is required and must be set to Sale. 
     // If the transaction does not include a one-time purchase, this field is ignored. 
     // It is one of the following values: 
     // Sale – This is a final sale for which you are requesting payment (default). 
     // Authorization – This payment is a basic authorization subject to settlement with PayPal Authorization and Capture. 
     // Order – This payment is an order authorization subject to settlement with PayPal Authorization and Capture. 
     // BY DEFAULT THIS IS SALE 
     paydtl.PaymentAction = (PaymentActionCodeType)Enum.Parse(typeof(PaymentActionCodeType), paymentType); 

     // (Optional) Total shipping costs for this order. 
     // Note: 
     // You must set the currencyID attribute to one of the 3-character currency codes 
     // for any of the supported PayPal currencies. 
     // Character length and limitations: 
     // Value is a positive number which cannot exceed $10,000 USD in any currency. 
     // It includes no currency symbol. 
     // It must have 2 decimal places, the decimal separator must be a period (.), 
     // and the optional thousands separator must be a comma (,) 
     if (shipTotal != string.Empty) 
     { 
      BasicAmountType shippingTotal = new BasicAmountType(); 
      shippingTotal.value = shipTotal.Trim(); 
      shippingTotal.currencyID = (CurrencyCodeType)Enum.Parse(typeof(CurrencyCodeType), currencyCode); 
      orderTotal += Convert.ToDecimal(shipTotal.Trim()); 
      paydtl.ShippingTotal = shippingTotal; 
     } 

     // (Optional) Total shipping insurance costs for this order. 
     // The value must be a non-negative currency amount or null if you offer insurance options. 
     // Note: 
     // You must set the currencyID attribute to one of the 3-character currency 
     // codes for any of the supported PayPal currencies. 
     // Character length and limitations: 
     // Value is a positive number which cannot exceed $10,000 USD in any currency. 
     // It includes no currency symbol. It must have 2 decimal places, 
     // the decimal separator must be a period (.), 
     // and the optional thousands separator must be a comma (,). 
     // InsuranceTotal is available since version 53.0. 

     //if (parameters["insuranceTotal"] != string.Empty) 
     //{ 
     // paydtl.InsuranceTotal = new BasicAmountType((CurrencyCodeType)Enum.Parse(typeof(CurrencyCodeType), parameters["currencyCode"]), parameters["insuranceTotal"]); 
     // paydtl.InsuranceOptionOffered = "true"; 
     // orderTotal += Convert.ToDecimal(parameters["insuranceTotal"]); 
     //} 

     // (Optional) Total handling costs for this order. 
     // Note: 
     // You must set the currencyID attribute to one of the 3-character currency codes 
     // for any of the supported PayPal currencies. 
     // Character length and limitations: Value is a positive number which 
     // cannot exceed $10,000 USD in any currency. 
     // It includes no currency symbol. It must have 2 decimal places, 
     // the decimal separator must be a period (.), and the optional 
     // thousands separator must be a comma (,). 

     //if (parameters["handlingTotal"] != string.Empty) 
     //{ 
     // paydtl.HandlingTotal = new BasicAmountType((CurrencyCodeType)Enum.Parse(typeof(CurrencyCodeType), parameters["currencyCode"]), parameters["handlingTotal"]); 
     // orderTotal += Convert.ToDecimal(parameters["handlingTotal"]); 
     //} 

     // (Optional) Sum of tax for all items in this order. 
     // Note: 
     // You must set the currencyID attribute to one of the 3-character currency codes 
     // for any of the supported PayPal currencies. 
     // Character length and limitations: Value is a positive number which 
     // cannot exceed $10,000 USD in any currency. It includes no currency symbol. 
     // It must have 2 decimal places, the decimal separator must be a period (.), 
     // and the optional thousands separator must be a comma (,). 
     if (salesTax != string.Empty) 
     { 
      paydtl.TaxTotal = new BasicAmountType((CurrencyCodeType)Enum.Parse(typeof(CurrencyCodeType), currencyCode), salesTax); 
      orderTotal += Convert.ToDecimal(salesTax); 
     } 

     // (Optional) Description of items the buyer is purchasing. 
     // Note: 
     // The value you specify is available only if the transaction includes a purchase. 
     // This field is ignored if you set up a billing agreement for a recurring payment 
     // that is not immediately charged. 
     // Character length and limitations: 127 single-byte alphanumeric characters 
     //if (parameters["orderDescription"] != string.Empty) 
     //{ 
     // paydtl.OrderDescription = parameters["orderDescription"]; 
     //} 

     BasicAmountType itemsTotal = new BasicAmountType(); 
     itemsTotal.value = Convert.ToString(itemTotal); 

     // PayPal uses 3-character ISO-4217 codes for specifying currencies in fields and variables. 
     itemsTotal.currencyID = (CurrencyCodeType)Enum.Parse(typeof(CurrencyCodeType), currencyCode); 

     paydtl.OrderTotal = new BasicAmountType((CurrencyCodeType)Enum.Parse(typeof(CurrencyCodeType), currencyCode), Convert.ToString(orderTotal)); 
     paydtl.PaymentDetailsItem = lineItems; 

     paydtl.ItemTotal = itemsTotal; 

     #region shipping address 

     AddressType shippingAddress = new AddressType(); 
     shippingAddress.Street1 = shipStreet; 
     shippingAddress.CityName = shipCity; 
     shippingAddress.StateOrProvince = shipState; 
     shippingAddress.Country = CountryCodeType.US; 
     shippingAddress.PostalCode = shipPostalcode; 
     shippingAddress.Name = shipName; 
     paydtl.ShipToAddress = shippingAddress; 
     #endregion 



     details.PaymentDetails.Add(paydtl); 

     setExpressCheckoutReq.SetExpressCheckoutRequestDetails = details; 
     SetExpressCheckoutReq expressCheckoutReq = new SetExpressCheckoutReq(); 
     expressCheckoutReq.SetExpressCheckoutRequest = setExpressCheckoutReq; 

     SetExpressCheckoutResponseType response = null; 
     try 
     { 

      response = service.SetExpressCheckout(expressCheckoutReq); 
     } 
     catch (System.Exception ex) 
     { 
      //contextHttp.Response.Write(ex.Message); 
      return null; 
     } 

     Dictionary<string, string> responseValues = new Dictionary<string, string>(); 
     responseValues.Add("Acknowledgement", response.Ack.ToString().Trim().ToUpper()); 
     if (response.Ack.ToString().Trim().ToUpper() == "SUCCESS") 
     { 
      responseValues.Add("Token", response.Token.ToString().Trim()); 
      responseValues.Add("TimeStamp", response.Timestamp.ToString().Trim()); 
     } 
     return responseValues; 

    }][1] 

我也attching我收到錯誤的屏幕截圖。我正在使用PaypalCoreSDK的1.3.5版本。任何幫助將非常感激。

例外：

PayPal.APIService.MakeRequestUsing(IAPICallPreHandler apiCallHandler) 
at PayPal.BasePayPalService.Call(IAPICallPreHandler apiCallHandler) 
at PayPal.PayPalAPIInterfaceService.PayPalAPIInterfaceServiceService.SetExpressChec‌​kout(SetExpressCheckoutReq setExpressCheckoutReq, String apiUserName) 
at PayPal.PayPalAPIInterfaceService.PayPalAPIInterfaceServiceService.SetExpressChec‌​kout(SetExpressCheckoutReq setExpressCheckoutReq)  upvote 
at gs_PayPalECAPI.PayPalProcess.SetExpressCheckout_Ecommerce(Dictionary`2 configurationMap, String returnUrl, String cancelUrl, String currencyCode, String paymentType, String ReqConfirmShipping, String addressoverride, String noShipping, String buyerEmail, String itemAmounts, String itemQuantities, String itemNames, String salesTax, String shipTotal, String shipStreet, String shipState, String shipCity, String shipPostalcode, String shipName) 

Answer 1

終於得到了解決和代碼工作。沒有任何東西被傳遞爲空，但是有些東西遺漏了，我不知道必須完成。

首先，在實現這個應該使用.Net Framework 4.5或更高版本。 其次下面的事情必須在調用SetExpressCheckout方法之前設置：

System.Net.ServicePointManager.Expect100Continue = true; 
System.Net.ServicePointManager.SecurityProtocol = System.Net.SecurityProtocolType.Tls12; 
System.Net.ServicePointManager.DefaultConnectionLimit = 9999;