protected override Expression <Func <MsBuildPropertyListAssociation, bool> > FindExisting(MsBuildPropertyListAssociation record)
 => existing
 => existing.MsBuildPropertyId == record.MsBuildPropertyId &&
 existing.MsBuildPropertyListId == record.MsBuildPropertyListId;
        protected override IEnumerable <object> EnumerateReferences(MsBuildPropertyListAssociation record)
        {
            yield return(record.MsBuildProperty);

            yield return(record.MsBuildPropertyList);
        }