Enumerable.Empty<T>() equivalent for IQueryable

When a method returns IEnumerable<T> and I do not have anything to return, we can use Enumerable.Empty<T>().

Is t开发者_Go百科here an equivalent to the above for a method returning IQueryable<T>

Maybe:

Enumerable.Empty<T>().AsQueryable();

Enumerable.Empty<T>().AsQueryable(); should do it.

Try return new T[0].AsQueryable();

Say you have an IQueryable<T> called result:

return result.Take(0);

I would advise against alejandrobog's answer as this will still use memory to create an empty array.

Array.Empty<T>().AsQueryable();

or

Enumerable.Empty<T>().AsQueryable();

are preferred. Array.Empty will allocate a static typed array so only one empty array of T is created and that is shared amongst all Empty queryables.

Enumerable.Empty().AsQueryable(); is wrong since Union will break and wont work. Workaround is

var db = new DbContext();
var query = db.Set<T>().Take(0);