C# - System.Action

 A delegate built into .net

using System;
private Action m_Action;
m_Action = Func1;
m_Action += Func1;
m_Action += Func2;

m_Action?.invoke()

//获取委托中的Action列表
var actionList = m_Action.getInvocationList();

//委托中是否存在指定的Action
var isExit = Array.IndexOf(actionList,(Action)Func1);
var isExit = Array.IndexOf(actionList,(Action)Func2);


void Func1(){}

voi Func2(){}