订阅强制转换对象时不会触发事件

问：

我有这个代码：

public class StateController
{
    public MainEventHandler EventHandler { get => eventHandler; }

    private State currentState;
    private MainEventHandler eventHandler = new();
    private MainRepository repository = new();
    private MainLogic logic = new();

    public void ActivateState(State toActivate)
    {
        if (toActivate is StateA) 
        {
            var properties = StateA.Properties();
            properties.eventHandler = eventHandler;
            properties.repository = repository;
            toActivate.Setup(properties);
        }
        else if (toActivate is StateB) 
        {
            var properties = StateB.Properties();
            properties.eventHandler = eventHandler;
            properties.logic = repository;
            toActivate.Setup(properties);
        }
    }

    public void Start()
    {
        if (eventHandler.onStart != null) 
            onStart();
    }

    public void DoLogic()
    {
        if (eventHandler.onCalculateLogic != null) 
            onCalculateLogic();
    }
}

public class MainEventHandler
{
    public delegate void OnStart();
    public event OnStart onStart;

    public delegate void OnCalculateLogic();
    public event OnCalculateLogic onCalculateLogic;
}

public class StateA: State
{
    public class Properties
    {
         public MainEventHandler eventHandler;
         public MainRepository repository;
    }

    private Properties props;

    public void Setup(object properties)
    {
        props = properties as Properties;
        props.eventHandler.onStart += Start;
    }

    public void CleanUp()
    {
        props.eventHandler.onStart -= Start;
    }

    private void Start() //Doesn't get triggered because onStart is null
    {
        ....
    }
}

public class StateB: State
{
    public class Properties
    {
         public MainEventHandler eventHandler;
         public MainLogic repository;
    }

    private Properties props;

    public void Setup(object properties)
    {
        props = properties as Properties;
        props.eventHandler.onCalculateLogic += Calculate;
    }

    public void CleanUp()
    {
        props.eventHandler.onCalculateLogic -= Calculate;
    }

    private void Calculate() //Doesn't get triggered because onCalculateLogic is null
    {
        ....
    }
}

public MainSceneController: Monobehavior
{
    private StateController stateController = new();
    private StateA firstState = new();
    private StateB secondState = new();
    Awake()
    {
        stateController.ActivateState(firstState);
    }

    Start()
    {
        if(stateController.EventHandler.onStart != null) stateController.EventHandler.onStart(); // stateController.EventHandler.onStart is null apparently even though I have set it in ActivateState()
        stateController.ActivateState(secondState);
    }

    Update()
    {
        if(stateController.EventHandler.onCalculateLogic != null) stateController.EventHandler.onCalculateLogic(); // stateController.EventHandler.onCalculateLogic is null apparently even though I have set it in ActivateState()

    }

}

我想从中传递一个对象，该对象具有可以从状态内部订阅的事件。的参数是一个对象，因为我们可以有多种类型的属性。而属性是国家与其外部系统交互的唯一方式。但不幸的是，这些事件根本不会被触发，因为它们总是空的。虽然正如你所看到的，我已经添加了StateControllerSetup()

`props.eventHandler.onStart += Start;`

和

`props.eventHandler.onCalculateLogic += Calculate;`

如何解决此问题？

谢谢。