Question

The question was originally asked at http://entityframework.codeplex.com/discussions/399499#post928179 .

Good day! Please tell me if it is wrong place to post this question.

I have a query as follows:

IQueryable<Card> cardsQuery =
  dataContext.Cards
  .Where(predicate)
  .OrderByDescending(kc => kc.SendDate)
  .AsQueryable();

Then I try:


Task<Card[]> result = cardsQuery.ToArrayAsync();


And then exception rises:

The source IQueryable doesn't implement IDbAsyncEnumerable<Models.Card>

I use modified version of ‘EF 5.x DbCotext generator’.

How to avoid it?

UPDATE

Important remark is that I have method to produce IQuerayble<Card> as follows:

class Repository {
  public IQueryable<Card> GetKudosCards(Func<Card, bool> predicate) {
    IEnumerable<KudosCard> kudosCards = kudosCardsQuery.Where(predicate);
     return kudosCards
            .OrderByDescending(kc => kc.SendDate)
            .AsQueryable();
  }
}

Answer 1

The problem is as follows.

I have a method:

class Repository {
  public IQueryable<Card> GetKudosCards(Func<Card, bool> predicate) {
    IEnumerable<KudosCard> kudosCards = kudosCardsQuery.Where(predicate);
    return kudosCards
            .OrderByDescending(kc => kc.SendDate)
            .AsQueryable();
  }
}

The problem is that kudosCards has type IEnumerable<KudosCard>. That throws exception. If I change predicate type to Expression<Func<Card, bool> predicate then everything works just fine.