C#委托詳解執行個體

首先看一個例子，一名律師代表三名員工向老闆讨薪

員工将讨薪方法委托為律師

涉及到三個對象：員工，老闆，律師

/// <summary>
    /// 員工
    /// </summary>
    class Employee {
        public string name;
        public int money;

        public Employee() { }
        public Employee(string name, int money) {
            this.name = name;
            this.money = money;
        }
        /// <summary>
        /// 員工有讨薪的權利，也就是有這個方法
        /// </summary>
        public void GetMoney(Boss b) {
            Console.WriteLine("我是{0}，{1}還我血汗錢{2}",name,b.name,money);
        }
    }

           

/// <summary>
/// 老闆
/// </summary>
class Boss {
        public string name;
        public Boss(string name) {
            this.name = name;
        }
    }
           

//建立一個讨薪的委托

delegate void GetMoneyDele(Boss boss)

/// <summary>
 /// 律師
 /// </summary>
 class Lawyee {
        public string name;
        public Lawyee(string name) {
            this.name = name;
        }
        GetMoneyDele getMoneyDele = null;
        Boss target = null;
        /// <summary>
        /// 員工将讨薪方法委托為律師
        /// 1.需要擷取員工的讨薪方法：将方法當成一個參數進行傳遞
        /// 2.方法所需要參數也需要傳進來
        /// </summary>
        public void AddGetMoney(GetMoneyDele dele,Boss boss) {
            if (getMoneyDele == null)
            {
                getMoneyDele = new GetMoneyDele(dele);
                target = boss;
            }
            else {
                getMoneyDele += dele;
            }
        }

        /// <summary>
        /// 律師開始讨薪了：執行委托
        /// </summary>
        public void GetMoney() {
            getMoneyDele(target);
        }

    }
           

static void Main(string[] args)
        {
            //Boss類：老闆類
            //Lawyee類：律師類
            //Employee員工類：
            //員工張三、李四、王五委托律師趙六律師跟Boss田七讨薪

            Boss zj = new Boss("zj");

            Employee zhangsan = new Employee("張三", 10000);
            Employee lisi = new Employee("李四", 12000);
            Employee wangwu = new Employee("王五", 22000);

            //zhangsan.GetMoney(zj);
            //lisi.GetMoney(zj);
            //wangwu.GetMoney(zj);
            Lawyee zhaoliu = new Lawyee("趙六");
            zhaoliu.AddGetMoney(zhangsan.GetMoney, zj);
            zhaoliu.AddGetMoney(lisi.GetMoney, zj);
            zhaoliu.AddGetMoney(wangwu.GetMoney, zj);
            zhaoliu.GetMoney();
            Console.ReadLine();
        }