How do I access the States of an AnimationController with c#?

I have some static methods you can use to get states in an animator. You may have to use unityeditor.internal though.

 public static AnimatorState[] GetAnimatorStateNames(Animator _animator)
     {
         AnimatorController controller = _animator ? _animator.runtimeAnimatorController as AnimatorController : null;
         return controller == null ? null : controller.layers.SelectMany(l => l.stateMachine.states).Select(s => s.state).ToArray();
     }
 
     public static AnimatorState[] GetAnimatorStateNames(AnimatorController _animator)
     {
         AnimatorController controller = _animator ? _animator : null;
         return controller == null ? null : controller.layers.SelectMany(l => l.stateMachine.states).Select(s => s.state).ToArray();
     }
 
     public static int FindStateLayer(AnimatorController _animCont, string _stateName)
     {
         for (int i = 0; i < _animCont.layers.Length; i++)
         {
             foreach (var child in _animCont.layers[i].stateMachine.states)
             {
                 if (child.state.name == _stateName)
                     return i;
             }
         }
         Debug.LogError("could not find layer with state name: " + _stateName + " in: " + _animCont.name);
         return 0;
     }