Question

The method returns IEnumerable via a yield return statement.

If the yield statement never occurs (it’s inside conditional logic), will the method return null, or will it return an Enumerable with a count of 0?

Answer 1

A valid IEnumerable that produces no values when you iterate through it.

Just think of it: You can store the IEnumerable generator in a variable – the code itself just gets executed when you actually iterate through the results. How could you execute the code if you had null? Or how did you know the function doesn’t yield anything without running it.