参数中C＃中泛型的问题

I have class like this:

我有这样的课:

Class foo<T> 
{
  anotherfoo<T>;

  foo(){}
  foo(foo<T> aFoo)
  { anotherfoo = aFoo; }
}
void main() 
{
foo<string> obj1 = new foo<string>();
foo<int> obj2 = new foo<int>(obj1);
}
Class foo<T