Plugins Microsoft Dynamics CRM 2013 SDK问题-错误

我在Microsoft dynamics crm 2013中遇到以下问题：

[Contracts.Plugins: Contracts.Plugins.Autonumber]
[97f9577d-1394-e311-a461-000c29f9727b: PostInvoiceDetailsUpdate]
Execption: Object reference not set to an instance of an object.    at Contracts.Plugins.SumAmounts.Execute(IServiceProvider serviceProvider)
Execption: An error occured in the plug-in.    at Contracts.Plugins.SumAmounts.Execute(IServiceProvider serviceProvider)
at Contracts.Plugins.Autonumber.Execute(IServiceProvider serviceProvider)

我有两个母公司（法律合同或协议），在1:M的关系中引用修订和财务细节。我需要对子记录中的金额求和，并将该金额存储在父记录中

[Contracts.Plugins: Contracts.Plugins.Autonumber]
[97f9577d-1394-e311-a461-000c29f9727b: PostInvoiceDetailsUpdate]
Execption: Object reference not set to an instance of an object.    at Contracts.Plugins.SumAmounts.Execute(IServiceProvider serviceProvider)
Execption: An error occured in the plug-in.    at Contracts.Plugins.SumAmounts.Execute(IServiceProvider serviceProvider)
at Contracts.Plugins.Autonumber.Execute(IServiceProvider serviceProvider)

我编写了一个插件，可以为每个子实体创建、更新和删除

[Contracts.Plugins: Contracts.Plugins.Autonumber]
[97f9577d-1394-e311-a461-000c29f9727b: PostInvoiceDetailsUpdate]
Execption: Object reference not set to an instance of an object.    at Contracts.Plugins.SumAmounts.Execute(IServiceProvider serviceProvider)
Execption: An error occured in the plug-in.    at Contracts.Plugins.SumAmounts.Execute(IServiceProvider serviceProvider)
at Contracts.Plugins.Autonumber.Execute(IServiceProvider serviceProvider)

必须采取的措施如下：

[Contracts.Plugins: Contracts.Plugins.Autonumber]
[97f9577d-1394-e311-a461-000c29f9727b: PostInvoiceDetailsUpdate]
Execption: Object reference not set to an instance of an object.    at Contracts.Plugins.SumAmounts.Execute(IServiceProvider serviceProvider)
Execption: An error occured in the plug-in.    at Contracts.Plugins.SumAmounts.Execute(IServiceProvider serviceProvider)
at Contracts.Plugins.Autonumber.Execute(IServiceProvider serviceProvider)

看看我的父母是合法合同还是协议

将所有子记录金额相加

找到父项并存储求和值

问题： Microsoft已在新SDK中删除了从子网格组件获取信息的功能，因此即使客户端有可用的数据，也无法访问

[Contracts.Plugins: Contracts.Plugins.Autonumber]
[97f9577d-1394-e311-a461-000c29f9727b: PostInvoiceDetailsUpdate]
Execption: Object reference not set to an instance of an object.    at Contracts.Plugins.SumAmounts.Execute(IServiceProvider serviceProvider)
Execption: An error occured in the plug-in.    at Contracts.Plugins.SumAmounts.Execute(IServiceProvider serviceProvider)
at Contracts.Plugins.Autonumber.Execute(IServiceProvider serviceProvider)

当我运行下面的代码时，我在parentID上得到一个null的异常：“If（c.Attributes.Contains（…）”测试导致一个异常

[Contracts.Plugins: Contracts.Plugins.Autonumber]
[97f9577d-1394-e311-a461-000c29f9727b: PostInvoiceDetailsUpdate]
Execption: Object reference not set to an instance of an object.    at Contracts.Plugins.SumAmounts.Execute(IServiceProvider serviceProvider)
Execption: An error occured in the plug-in.    at Contracts.Plugins.SumAmounts.Execute(IServiceProvider serviceProvider)
at Contracts.Plugins.Autonumber.Execute(IServiceProvider serviceProvider)

如果我运行与命令行相同的代码，它就可以正常工作，只有当作为插件运行时，它才会呕吐

[Contracts.Plugins: Contracts.Plugins.Autonumber]
[97f9577d-1394-e311-a461-000c29f9727b: PostInvoiceDetailsUpdate]
Execption: Object reference not set to an instance of an object.    at Contracts.Plugins.SumAmounts.Execute(IServiceProvider serviceProvider)
Execption: An error occured in the plug-in.    at Contracts.Plugins.SumAmounts.Execute(IServiceProvider serviceProvider)
at Contracts.Plugins.Autonumber.Execute(IServiceProvider serviceProvider)

代码段：

         EntityReference parentAgreementId = new EntityReference();
         EntityReference parentContractId = new EntityReference();
         QueryByAttribute querybyattribute = new QueryByAttribute("new_invoicedetails");
                 querybyattribute.ColumnSet = new ColumnSet(true);

                 //  Attribute to query.

                querybyattribute.Attributes.AddRange("new_invoicedetailsid");

                 //  Value of queried attribute to return.

                querybyattribute.Values.AddRange(sItem.getChildId());

                 //  Query passed to service proxy.
                 EntityCollection retrieved = service.RetrieveMultiple(querybyattribute);

                 //  Iterate through returned collection.
                 foreach (var c in retrieved.Entities)
                 {
                     If (c.Attributes.Contains("new_contractnumberid"))
                     {
                         parentContractId = c.GetAttributeValue<EntityReference>("new_contractnumberid");
                     }

                     If (c.Attributes.Contains("new_agreementnumberid"))
                     {
                         parentAgreementId = c.GetAttributeValue<EntityReference>("new_agreementnumberid");
                     }

[Contracts.Plugins: Contracts.Plugins.Autonumber]
[97f9577d-1394-e311-a461-000c29f9727b: PostInvoiceDetailsUpdate]
Execption: Object reference not set to an instance of an object.    at Contracts.Plugins.SumAmounts.Execute(IServiceProvider serviceProvider)
Execption: An error occured in the plug-in.    at Contracts.Plugins.SumAmounts.Execute(IServiceProvider serviceProvider)
at Contracts.Plugins.Autonumber.Execute(IServiceProvider serviceProvider)

---

我认为If应该写成If（小写）。我错了吗？

小写的“If语句”不影响结果。你有什么例外？你能在这里发布吗？

[Contracts.Plugins: Contracts.Plugins.Autonumber]
[97f9577d-1394-e311-a461-000c29f9727b: PostInvoiceDetailsUpdate]
Execption: Object reference not set to an instance of an object.    at Contracts.Plugins.SumAmounts.Execute(IServiceProvider serviceProvider)
Execption: An error occured in the plug-in.    at Contracts.Plugins.SumAmounts.Execute(IServiceProvider serviceProvider)
at Contracts.Plugins.Autonumber.Execute(IServiceProvider serviceProvider)