obtaing il GUID per un EntityReference utilizzando plugin in DynamicsCRM

Question

Questa domanda è in relazione ad un plugin che ora sto creando per Dynamics CRM 2011.

Ho un ente che ha 5 attributi. 1 di questi attributi è un Lookup ad un altro soggetto.

Quello che sto cercando di fare con la mia Plugin è quello di prelevare il GUID dell'entità Lookup. Semplice, no?

Ma no, mi sta dando problemi, ho provato decine di modi utilizzando EntityReference Per ottenere il GUID, ma non ci riesco. Ho provato a generare un preimage che non è riuscito troppo.

Ecco un frammento di codice.

Entity entity = (Entity)context.InputParameters["Target"];

   if (entity.LogicalName == "new_producttaxrate")
  {
   if (entity.Attributes.Contains("new_product"))
     {

     EntityReference ownerLookup = (EntityReference)entity.Attributes["new_product"];
      productName = ownerLookup.Name;
      Guid  productId = ownerLookup.Id;

    }
  }

anche si avvicinò con questo

     if (entity.Attributes.Contains("new_producttaxrateid"))
              {
                  Guid myGuid = (Guid)entity.Attributes["new_producttaxrateid"];
                  EntityReference ownerLookup = new EntityReference("new_product", myGuid);
                   pid = ownerLookup.Id;
               }

Continuo a ricevere questo errore

    Unhandled Exception: System.ServiceModel.FaultException`1[[Microsoft.Xrm.Sdk.OrganizationServiceFault, Microsoft.Xrm.Sdk, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]: Condition for attribute 'new_producttaxrate.new_product': expected argument(s) of type 'System.Guid' but received 'System.DBNull'.Detail: 
<OrganizationServiceFault xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.microsoft.com/xrm/2011/Contracts">
  <ErrorCode>-2147220989</ErrorCode>
  <ErrorDetails xmlns:d2p1="http://schemas.datacontract.org/2004/07/System.Collections.Generic">
    <KeyValuePairOfstringanyType>
      <d2p1:key>CallStack</d2p1:key>
      <d2p1:value xmlns:d4p1="http://www.w3.org/2001/XMLSchema" i:type="d4p1:string">   at Microsoft.Crm.Extensibility.VersionedPluginProxyStepBase.Execute(PipelineExecutionContext context)
   at Microsoft.Crm.Extensibility.Pipeline.Execute(PipelineExecutionContext context)
   at Microsoft.Crm.Extensibility.MessageProcessor.Execute(PipelineExecutionContext context)
   at Microsoft.Crm.Extensibility.InternalMessageDispatcher.Execute(PipelineExecutionContext context)
   at Microsoft.Crm.Extensibility.ExternalMessageDispatcher.ExecuteInternal(IInProcessOrganizationServiceFactory serviceFactory, IPlatformMessageDispatcherFactory dispatcherFactory, String messageName, String requestName, Int32 primaryObjectTypeCode, Int32 secondaryObjectTypeCode, ParameterCollection fields, CorrelationToken correlationToken, CallerOriginToken originToken, UserAuth userAuth, Guid callerId, Guid transactionContextId, Int32 invocationSource, Nullable`1 requestId, Version endpointVersion)
   at Microsoft.Crm.Extensibility.OrganizationSdkServiceInternal.ExecuteRequest(OrganizationRequest request, CorrelationToken correlationToken, CallerOriginToken callerOriginToken, WebServiceType serviceType)
   at Microsoft.Crm.Extensibility.OrganizationSdkServiceInternal.Execute(OrganizationRequest request, CorrelationToken correlationToken, CallerOriginToken callerOriginToken, WebServiceType serviceType)</d2p1:value>
    </KeyValuePairOfstringanyType>
  </ErrorDetails>
  <Message>Condition for attribute 'new_producttaxrate.new_product': expected argument(s) of type 'System.Guid' but received 'System.DBNull'.</Message>
  <Timestamp>2011-03-17T13:21:04.6999035Z</Timestamp>
  <InnerFault i:nil="true" />
  <TraceText>

[VATPlugin2: VATPlugin2.TaxRateValidation]
[4b0b7f5c-9950-e011-849d-000c292be099: VATPlugin2.TaxRateValidation: Create of new_producttaxrate]


</TraceText>
</OrganizationServiceFault>

Answer 1

     if (entity.Attributes.Contains("new_product"))
                   {

                       productGUID = ((EntityReference)entity["new_product"]).Id;
                       Entity member = service.Retrieve("product", ((EntityReference)entity["new_product"]).Id, new ColumnSet(true));
                       if (member.Attributes.Contains("name"))
                       {
                           productName = member.Attributes["name"].ToString();
                       }
                   }