下面是一些用于生成 UPS 运输标签的代码。它基于 UPS 开发人员工具包中提供的 .net 示例。我的问题是下面以粗体突出显示的行。它抛出和错误如下“System.NullReferenceException：对象引用未设置为对象的实例。”。
我所知道的是，如果您希望 UPS API 返回标签的链接，则需要此 LabelLinksIndicator。否则，它会返回货件的详细信息，但没有标签。UPS 文件的相关部分在我的问题的底部。
我需要做什么来克服这个错误？从文档中我不清楚我应该为 LabelLinksIndicator 传递什么值。我试过传递一个 1、true 和一个空字符串。在每种情况下都有相同的错误。错误消息似乎表明有一个我需要实例化的对象，但我目前没有。但是，我不知道要实例化什么。不幸的是，网络和 UPS.com 上的可用信息很少。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Foo.Web.UPSWebReference;
namespace Foo.Web.Auth
{
public partial class UPS : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (Request.QueryString["id"] != null)
{
try
{
ShipService shpSvc = new ShipService();
ShipmentRequest shipmentRequest = new ShipmentRequest();
UPSSecurity upss = new UPSSecurity();
UPSSecurityServiceAccessToken upssSvcAccessToken = new UPSSecurityServiceAccessToken();
upssSvcAccessToken.AccessLicenseNumber = "foo";
upss.ServiceAccessToken = upssSvcAccessToken;
UPSSecurityUsernameToken upssUsrNameToken = new UPSSecurityUsernameToken();
upssUsrNameToken.Username = "foo";
upssUsrNameToken.Password = "foo";
upss.UsernameToken = upssUsrNameToken;
shpSvc.UPSSecurityValue = upss;
RequestType request = new RequestType();
String[] requestOption = { "nonvalidate" };
request.RequestOption = requestOption;
shipmentRequest.Request = request;
ShipmentType shipment = new ShipmentType();
shipment.Description = "Ship webservice example";
ReturnServiceType rtn = new ReturnServiceType();
rtn.Code = "8";
rtn.Description = "Description";
ShipperType shipper = new ShipperType();
shipper.ShipperNumber = "foo";
PaymentInfoType paymentInfo = new PaymentInfoType();
ShipmentChargeType shpmentCharge = new ShipmentChargeType();
BillShipperType billShipper = new BillShipperType();
billShipper.AccountNumber = "foo";
shpmentCharge.BillShipper = billShipper;
shpmentCharge.Type = "01";
ShipmentChargeType[] shpmentChargeArray = { shpmentCharge };
paymentInfo.ShipmentCharge = shpmentChargeArray;
shipment.PaymentInformation = paymentInfo;
foo.Web.UPSWebReference.ShipAddressType shipperAddress = new foo.Web.UPSWebReference.ShipAddressType();
String[] addressLine = { "301 166th Street" };
shipperAddress.AddressLine = addressLine;
shipperAddress.City = "Jersey City";
shipperAddress.PostalCode = "07310";
shipperAddress.StateProvinceCode = "NJ";
shipperAddress.CountryCode = "US";
shipperAddress.AddressLine = addressLine;
shipper.Address = shipperAddress;
shipper.Name = "ABC Associates";
shipper.AttentionName = "ABC Associates";
ShipPhoneType shipperPhone = new ShipPhoneType();
shipperPhone.Number = "1234567890";
shipper.Phone = shipperPhone;
shipment.Shipper = shipper;
ShipFromType shipFrom = new ShipFromType();
foo.Web.UPSWebReference.ShipAddressType shipFromAddress = new foo.Web.UPSWebReference.ShipAddressType();
String[] shipFromAddressLine = { "100 82nd Street" };
shipFromAddress.AddressLine = addressLine;
shipFromAddress.City = "New York";
shipFromAddress.PostalCode = "10024";
shipFromAddress.StateProvinceCode = "NY";
shipFromAddress.CountryCode = "US";
shipFrom.Address = shipFromAddress;
shipFrom.AttentionName = "Mr.ABC";
shipFrom.Name = "ABC Associates";
shipment.ShipFrom = shipFrom;
ShipToType shipTo = new ShipToType();
ShipToAddressType shipToAddress = new ShipToAddressType();
String[] addressLine1 = { "Some Street" };
shipToAddress.AddressLine = addressLine1;
shipToAddress.City = "Roswell";
shipToAddress.PostalCode = "30076";
shipToAddress.StateProvinceCode = "GA";
shipToAddress.CountryCode = "US";
shipTo.Address = shipToAddress;
shipTo.Address.ResidentialAddressIndicator = "1"; //dan
shipTo.AttentionName = "DEF";
shipTo.Name = "DEF Associates";
ShipPhoneType shipToPhone = new ShipPhoneType();
shipToPhone.Number = "1234567890";
shipTo.Phone = shipToPhone;
shipment.ShipTo = shipTo;
ServiceType service = new ServiceType();
service.Code = "03";
service.Description = "Ground";
shipment.Service = service;
PackageType package = new PackageType();
package.Description = "Deliver to Warehouse";
PackageWeightType packageWeight = new PackageWeightType();
packageWeight.Weight = "10";
ShipUnitOfMeasurementType uom = new ShipUnitOfMeasurementType();
uom.Code = "LBS";
packageWeight.UnitOfMeasurement = uom;
package.PackageWeight = packageWeight;
PackagingType packType = new PackagingType();
packType.Code = "02";
package.Packaging = packType;
PackageType[] pkgArray = { package };
shipment.Package = pkgArray;
LabelSpecificationType labelSpec = new LabelSpecificationType();
LabelImageFormatType labelImageFormat = new LabelImageFormatType();
labelImageFormat.Code = "GIF";
labelSpec.LabelImageFormat = labelImageFormat;
string userAgent = Request.UserAgent;
labelSpec.HTTPUserAgent = userAgent;
shipmentRequest.LabelSpecification = labelSpec;
**shipmentRequest.Shipment.ShipmentServiceOptions.LabelDelivery.LabelLinksIndicator = "1";**
shipmentRequest.Shipment = shipment;
System.Net.ServicePointManager.CertificatePolicy = new TrustAllCertificatePolicy();
ShipmentResponse shipmentResponse = shpSvc.ProcessShipment(shipmentRequest);
Response.Redirect(shipmentResponse.ShipmentResults.LabelURL.ToString());
