Cannot implicitly convert type IEnumerable to IQueryable

Question

Obfuscated Scenario: A person has zero, one or many pets.

Using Linq to Sql, the need is to get an IQueryable list of pets for the given pe

Answer 1

Look at your query:

    var personPets= from p in Person
    where p.ID == somePersonID
    select p.Pets;

What is happening is that you are returning an IEnumerable (of one element) of IEntitySet types (the type: IEnumerable>).

You should get an IEnumerable and it will be converted to IQueryable by the AsQueryable method:

public IQueryable GetPersonPets(int personID)
{
    var person = Person.Single(p=> p.ID == personID);

    return person.Pets.AsQueryable();
}