按集合 ID 检索记录，LINQ

Question

I want to retrieve the rows if the Id exists in the collection of Ids I'm passing.

Here's what I've tried so far.

var typeOfNeedIds = [1,2,3];
var query = (from up in _context.UserNeeds
             .Include(u => u.UserNeedTypes).ThenInclude(ut => ut.TypeOfNeed)
                where (typeOfNeedIds.IsNullOrEmpty() ||
                       typeOfNeedIds.All(id => up.UserNeedTypes.Select(t => t.TypeOfNeedId).Contains(id)))
                select up).AsNoTracking();

I've also tried

typeOfNeedIds.Any(id => up.UserNeedTypes.Any(t => t.TypeOfNeedId == id))

But none worked.

What's wrong with my code? Any help would be highly appreciated.

Answer 1

This will return all UserNeeds , where UserNeedTypes contains at least one of typeOfNeedIds .

var typeOfNeedIds = [1,2,3];
var query = _context.UserNeeds.Where(un =>
                  un.UserNeedTypes.Any(unp =>
                      typeOfNeedIfs.Contains(unp.TypeOfNeedId)
                  )
            )
            .Include(u => u.UserNeedTypes)
            .ThenInclude(ut => ut.TypeOfNeed)
            .AsNoTracking();