Question

This is puzzling me. I’m using PetaPoco to retreive some values from a database, and then looping over them and retrieving a value to assign to one of the properties of each object.

    public IEnumerable<RetreaveIndex> FillResults(IEnumerable<RetreaveIndex> results)
    {
        //add the associated users
        foreach (RetreaveIndex index in results)
        {
            index.AssociatedUsers = _registeredUserDao.GetUsersByIndex(index).ToList();
        }
        return results;
    }

When I set a breakpoint during the foreach loop, the AssociatedUsers property is being set correctly.

but then in a breakpoint at the end of the loop, it didn’t save it?

I’m confused, shouldn’t Index be a reference to a place in memory which is being modified? It’s an object after all. What am I missing here?

Answer 1

1. What is the IEnumerable implementation? Could it be returning a copy of the object?

2. Is RetreaveIndex a struct, and thus a value type? If so, then the variable index will be a copy.