关于unity中委托等的用法

不多说，直接上代码，不足之处，多多指教

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;

public class ActionAndUnityEvent : MonoBehaviour {

    public delegate int m_delegate(int a,int b, int c);
    m_delegate m_mydelegate;
    event m_delegate m_event;
       
    public Action<int, int> m_action;

    public UnityAction<int, int> m_unityAction;

    public UnityEvent m_unityEvent = new UnityEvent();
    void Start()
    {


        m_unityEvent.AddListener(() => ListenerAdd(10,10));
        m_unityEvent.Invoke();



        m_mydelegate += Add;
        if (m_mydelegate != null)
        {
            m_mydelegate(1, 2, 3);
        }



        m_event += Add;
        if (m_event!=null)
        {
            m_event(1,3,5);
        }



        m_unityAction += Add;
        if (m_unityAction!=null)
        {
            m_unityAction(3, 5);
        }



        m_action += Add;
        if (m_action!=null)
        {
            m_action(2, 3);
        }
    }


    public  void Add(int a, int b)
    {
        Debug.Log(a + b);
    }



    public int Add(int a, int b, int c)
    {
        Debug.Log(a + b + c);
        return a + b + c;
    }




    public  void  ListenerAdd(int a,int b)
    {
        Debug.Log(a + b);
    }
}