c# – 类型`T’必须是可转换的,以便在泛型类型或方法中将其用作

public class FSMSystem<T> : MonoBehaviour where T : FSMSystem<T>
{
    private T m_Owner = default(T);

    protected FSMState<T> currentState;

    private Dictionary<int,FSMState<T>> m_states;

    public FSMSystem(T owner)
    {
        m_Owner = GameObject.FindObjectOfType(typeof(T)) as T; //owner;
        m_states = new Dictionary<int,FSMState<T>>();
    }

    protected void AddState( FSMState<T> state )
    {
        m_states.Add( state.GetStateID(),state );
    }
}

第二节,FSMState：

public abstract class FSMState<T>
{   
    public abstract int GetStateID();

    public abstract void OnEnter (FSMSystem<T> fsm,FSMState<T> prevState);
    public abstract void OnUpdate (FSMSystem<T> fsm);
    public abstract void OnExit (FSMSystem<T> fsm,FSMState<T> nextState);
}

它会导致以下错误：

error CS0309: The type ‘T‘ must be convertible to ‘FSMSystem<T>‘ in
order to use it as parameter ‘T‘ in the generic type or method
‘FSMSystem<T>‘

有人能告诉我如何解决这个问题吗？我看到很多其他类似的帖子,但我没有看到这种关系.