private bool IsEntityRequiredForeignKeyEmpty(DbEntityEntry entityEntry, string errProp)
{
RelationshipManager relMgr =
((IObjectContextAdapter)this).ObjectContext.ObjectStateManager
.GetRelationshipManager(entityEntry.Entity);
IEnumerable <IRelatedEnd> relEnds = relMgr.GetAllRelatedEnds();
IRelatedEnd relEnd = relEnds.Where(r =>
{
var elementType = (EntityTypeBase)r.RelationshipSet.ElementType;
var metadataProperty = elementType.MetadataProperties.GetValue(
"ReferentialConstraints", false);
var referentialConstraints =
(
System.Data.Entity.Core.Metadata.Edm.ReadOnlyMetadataCollection
<ReferentialConstraint>)metadataProperty.Value;
if (referentialConstraints.Any(constraint =>
{
return
(constraint.ToProperties.Any(
t => t.Nullable == false && t.IsPrimitiveType && t.Name == errProp));
}))
{
return(true);
}
return(false);
}).FirstOrDefault();
bool isEntityRequiredForeignKeyEmpty = relEnd != null;
return(isEntityRequiredForeignKeyEmpty);
}
protected T GetObjectByKey(T entity, bool lazyLoad)
{
EntityKey key = _context.CreateEntityKey(_entitySetName, entity);
object result;
if (_context.TryGetObjectByKey(key, out result))
{
if (!lazyLoad)
{
RelationshipManager relation = ((IEntityWithRelationships)result).RelationshipManager;
foreach (var relatedEnd in relation.GetAllRelatedEnds())
{
var relatedRef = relatedEnd as EntityReference;
if (relatedRef != null && !relatedRef.IsLoaded)
{
relatedRef.Load();
}
}
}
return(result as T);
}
return(null);
}