Question

I am comparing to list using intersect as follows:
(Using POCO Car as an example)

IEnumerable<Car> updatedCars = CarsList.Intersect(dbCarsList, carsComperator);

I defined carsComperator as follows

public bool Equals(Car x, Car y)
{
    if (object.ReferenceEquals(x, y)) return true;
    if (x == null || y == null) return false;
    return (x.Id == y.Id);
}

public int GetHashCode(Car car)
{
    return car.Id.GetHashCode();  // Id is Guid
}

But when Intersect command runs it brings nothing.
I assume that the program does not pass throgh my comparator since there is no stopping at my breakpoints there.

Any idea of what am I doing wrong?

Answer 1

Try iterating through the result list. If Intersect uses yield return mechanism, it will initiate comparison only when resulting IEnumerable is iterated through.