我尝试获取相关实体并收到此错误：对象引用未设置为对象的实例。
请参阅下面我的代码：
public IEnumerable<RUBAnnotation> GetAnnotationsByServiceRequestId(string serviceRequestId)
{
List<Annotation> annotationList = new List<Annotation>();
try
{
using (OrganizationServiceProxy organizationProxy = new OrganizationServiceProxy(organisationWebServiceUri, null, userCredentials, deviceCredentials))
{
organizationProxy.EnableProxyTypes();
var service = (IOrganizationService)organizationProxy;
OrganizationServiceContext orgContext = new OrganizationServiceContext(service);
Relationship rel = new Relationship("Incident_Annotation");
// get all incidents by incidentId
IEnumerable<Incident> incidents = from c in orgContext.CreateQuery<Incident>()
where c.Id == new Guid(serviceRequestId)
select c;
return GetAnnotationsEntities(incidents);
}
}
catch (Exception)
{
throw;
}
return null;
}
private List<RUBAnnotation> GetAnnotationsEntities(IEnumerable<Incident> incidents)
{
List<RUBAnnotation> annotationsList = new List<RUBAnnotation>();
try
{
foreach (Incident incident in incidents)
{
foreach (var annotation in incident.Incident_Annotation) // HERE OCCURS THE EXCEPTION!!
{
if (!string.IsNullOrEmpty(annotation.NoteText))
{
var customAnnotation = new RUBAnnotation();
customAnnotation.Id = annotation.Id.ToString();
if (annotation.Incident_Annotation != null)
{
customAnnotation.ServiceRequestId = annotation.Incident_Annotation.Id.ToString();
}
customAnnotation.Message = annotation.NoteText;
customAnnotation.CreatedOn = (DateTime)annotation.CreatedOn;
customAnnotation.UserId = annotation.CreatedBy.Id.ToString();
annotationsList.Add(customAnnotation);
}
}
}
}
catch (Exception e)
{
throw e;
}
return annotationsList;
}
当我尝试获取 event.Incident_Annotation 时，为什么会出现此错误？我认为 event.Incident_Annotation 是 NULL，但为什么呢？我的所有事件都有最少 1 个或多个注释。