C# List adding inherited items [closed]

Answer 1

This is a question about the fundamental object oriented concept called polymorphism. A Teacher is a Person, but your list of Person instances only knows that it contains a list of Person instances; it doesn't know anything about classes that derive from Person, nor does it need to.

If you are working with elements in your list, you can determine their type, and then cast them into that type like so:

foreach (Person x in people)
{
    if (x is Teacher)
    {
        Teacher y = (Teacher) x;
    }
}

Then you can access the properties of teacher: y.Position.