c# - does converting IQueryable to IEnumerable execute the query again?

Question

In my query i need to return IEnumerable but i dont know if this action make the query to execute again?

var data = Repository<Person>.Find().AsEnumerable();

Find() returns IQueryable and because IQueryable inherits IEnumerable. I doubt if AsEnumerable make the repetitive execution.

I know that var data = Repository<Person>.Find().ToList() executes the query two times. One for Find() and second for Tolist()

Answer 1

An IQueryable is an IEnumerable. There is no conversion, and therefore no work of any kind going on.

The work happens when you call GetEnumerator(), either explicitly or by invoking foreach on it.

Also, have you confirmed that Repository.Find().ToList() calls SQL twice? That doesn't sound right to me.