Add items to a list of objects, where the list itself is of type T

Question

private void Call()
{
    List<int> numbers= Get<List<int>>();
    MessageBox.Show("Numbers amount " + numbers.Count);
}

private T Get<T>() 
{
    T list = Activator.CreateInstance<T>();
    int a = 1;
    //HOW TO ADD "A" TO THE T-object [which is a list...]?
    return list;
}

Is it possible to let "T" be a List? I mean, it is possible (it compiles), but how do you add an object to these kind of lists?

Answer 1

I believe you want:

private static T Get<T>() where T : IList
{
    T list = Activator.CreateInstance<T>(); 
    int a = 1;
    (list as IList).Add(a);
    return list;
}