public override async Task <object> ReadFromAsync(DbDataReader reader, ICollectionPersister persister, ICollectionAliases descriptor, object owner, CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
object element = await(persister.ReadElementAsync(reader, owner, descriptor.SuffixedElementAliases, Session, cancellationToken)).ConfigureAwait(false);
object id = await(persister.ReadIdentifierAsync(reader, descriptor.SuffixedIdentifierAlias, Session, cancellationToken)).ConfigureAwait(false);
// eliminate duplication if loaded in a cartesian product
if (!_identifiers.ContainsValue(id))
{
_identifiers[_values.Count] = id;
_values.Add((T)element);
}
return(element);
}