Both a generic constraint and inheritance

Question

I have this scenario:

class A<T> 

I want a constrain of type Person like

class A<T> where T: Person

and I want A to inherit from B too.

example:

class A<T> : B : where T: Person

or

class A<T> where T: Person,  B

how can I do it?

Answer 1

class A<T> : B where T : Person

Answer 2

You can't inherit from more than one class in C#. So you can have

A<T> inherites from B and T is Person (Person is either class or interface):

class A<T>: B where T: Person {
  ...
}

A<T> doesn't necessary inherites from B; but T inherites from B and implements Person (Person can be interface only):

class A<T> where T: Person, B {
  ...
}

It seems that you want case 1:

// A<T> inherites from B; 
// T is restricted as being Person (Person is a class or interface)
class A<T>: B where T: Person {
  ...
}