LINQ: From a list of type T, retrieve only objects of a certain subclass S

by

you can do this:

IList<Person> persons = new List<Person>();

public IList<T> GetPersons<T>() where T : Person
{
    return persons.OfType<T>().ToList();
}

IList<Student> students = GetPersons<Student>();
IList<Teacher> teacher = GetPersons<Teacher>();

EDIT: added the where constraint.

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