delegate 的原始 写法 ：

using System.Collections;

using System.Collections.Generic;

using UnityEngine;

using System;

public class DelegateScript : MonoBehaviour {

    delegate void MyDelegate(int num);

    void Start()

    {

        //创建3 个MyDelegate 委托类的实例

        MyDelegate myDelegatel = new MyDelegate(this.PrintNum);

        MyDelegate myDelegate2 = new MyDelegate(this.PrintDoubleNum);

        MyDelegate myDelegate3 = new MyDelegate(this.PrintTripleNum);

        MyDelegate myDelegates = null;

        //使用Delegate 类的静态方法Combine

        myDelegates = (MyDelegate)Delegate.Combine(myDelegates, myDelegatel);

        myDelegates = (MyDelegate)Delegate.Combine(myDelegates, myDelegate2);

        myDelegates = (MyDelegate)Delegate.Combine(myDelegates, myDelegate3);

        //将myDelegates 传入Print 方法

        this.Print(10, myDelegates);

        ///移除方法 

        myDelegates = (MyDelegate)Delegate.Remove(myDelegates, myDelegatel);

        ///移除所有

        myDelegates = (MyDelegate)Delegate.RemoveAll(myDelegates, myDelegatel);

    }

    private void Print(int v, MyDelegate myDelegates)

    {

    }

    private void PrintTripleNum(int num)

    {

    }

    private void PrintDoubleNum(int num)

    {

    }

    private void PrintNum(int num)

    {

    }

}