Dynamics Community Forum Thread Details

Hi,

I am trying to get Guid of the Preimage lookup field.

The concept here is, I am having a Student entity that is related to Domain entity (1:N) and there is a subgrid of Domain in student form. now when the Domain record is deleted

i am fetching that records Student field value(Lookup or preImage) once i get the lookup field value i am writng a query expression to match Domains lookup student field with the preImage (Retrieve multiple) and the records count is null i am change the field value.

Below given is the source code i am using:

using Microsoft.Crm.Sdk;
using Microsoft.Xrm.Sdk.Query;

namespace makeFieldRed
{
public class checkForMoreRecords : IPlugin
{
public void Execute(IServiceProvider serviceProvider)
{
IPluginExecutionContext context = (IPluginExecutionContext)serviceProvider.GetService(typeof(IPluginExecutionContext));

IOrganizationServiceFactory serviceFactory = (IOrganizationServiceFactory)serviceProvider.GetService(typeof(IOrganizationServiceFactory));
IOrganizationService service = serviceFactory.CreateOrganizationService(context.UserId);

if (context.InputParameters.Contains(/Target/) && context.InputParameters[/Target/] is Entity)
{

if (context.PrimaryEntityName == /mahi_domain/)
{
Entity entity = (Entity)context.InputParameters[/Target/];

Entity preImage = context.PreEntityImages[/mahi_student/];//Getting preImage field value
//Entity preImage = (Entity)context.InputParameters[/preImage/];

Guid projectGuid = (Guid)preImage.Attributes[/mahi_student/]; //Getting guid of the preImage lookup

// getting domain records with student lookup
QueryExpression queryExpression = new QueryExpression(/mahi_domain/);
queryExpression.ColumnSet = new ColumnSet(/mahi_student/);
queryExpression.Criteria.AddCondition(new ConditionExpression(/mahi_student/, ConditionOperator.Equal, projectGuid));
EntityCollection domainRecords = service.RetrieveMultiple(queryExpression);

if(domainRecords != null)
{
Entity updateStudent = new Entity(/mahi_student/);
updateStudent.Id = projectGuid;
updateStudent[/mahi_domainsopp/] = /Plugin - Opp Exists/;
service.Update(updateStudent);
} else
{
Entity updateStudent = new Entity(/mahi_student/);
updateStudent.Id = projectGuid;
updateStudent[/mahi_domainsopp/] = /Plugin - Opp need to be created/;
service.Update(updateStudent);
}
}

}
}
}
}

Would be really helpful if anyone could share the correct syntax to retrieve the pre-image of a GUID field.

Or if there's a better way to go about approaching the problem.

Thanks!