Can the search results on the member search page be sorted by an ExtendedAttributes or ProfileFields field?
Can the search results on the member search page be sorted by an ExtendedAttributes or ProfileFields field?
These are 2 completely different methods for getting users so filters are not going to work. You use the users API, the members page is based on search. These methods are not interchangeable.
Realistically, you could just use Apis.Get<ISearchIndexing>().Events, handle the BeforeBulkIndex event for users, stuff a custom field in the document for the value you want to sort by and then modify any call the Apis.Get<ISearchResults> to include your custom sort in the query
community.telligent.com/.../searchindexing-in-process-api-service