Cannot cast between generic types

Question

I\'m trying to do this:

interface IA
{
}

class A : IA
{
}

class Foo where T: IA
{
}

class Program
{
    static void Main( string[] args )
    {
          


        

Answer 1

those classes perform operations on those base types and NEVER need to downcast them

Then why do you need a Foo to begin with? Declare it as Foo and add A's to it.