委托代码func和Action的基本用法

 public string GetPeopleInfo(string name, int age)
        {
            return $"姓名：{name}，年龄：{age}";
        }

 Func<string, int, string> fuc = new Func<string,int, string>(GetPeopleInfo);
            var res =fuc("吉姆",12);

        public void GetPeopleCount(int newNum,int oldNum)
        {
            newNum = newNum + oldNum;
        }

Action<int, int> action = new Action<int, int>(GetPeopleCount);
            action(1,2);