public IEnumerable <DisplayUser> Search(DisplayUserSearch search) => access.Search(search, loginContext.UserId);
public IEnumerable <DisplayUser> Search(DisplayUserSearch s, int excludeUserId)
=> context.DisplayUsers.AsNoTracking().Where(u =>
u.User.Id != excludeUserId &&
(string.IsNullOrWhiteSpace(s.FirstName) || u.FirstName.StartsWith(s.FirstName)) &&
(string.IsNullOrWhiteSpace(s.LastName) || u.LastName.StartsWith(s.LastName)) &&
(string.IsNullOrWhiteSpace(s.UserName) || u.User.UserName.StartsWith(s.UserName)));
