private async Task <IEnumerable <long> > ReceiveListMembers(TwitterAccount account, long listId) { var memberList = new List <long>(); long cursor = -1; do { var result = await account.GetListMembersAsync(listId, cursor); memberList.AddRange(result.Result .Do(u => Task.Run(() => UserProxy.StoreUser(u))) .Select(u => u.Id)); cursor = result.NextCursor; } while (cursor != 0); return(memberList); }