简单的委托应用

代码很简单，就不多做解释了

//定义一委托
   public delegate int OperationDelegate(int x,int y);
    public class Operator
    {
        private int _x, _y;
        public Operator(int x, int y)
        {
            this._x = x;
            this._y = y;
        }

        public void Operate(OperationDelegate del)
        {
            del(_x, _y);
        }
    }

调用

class Program
    {
        /// <summary>
        /// 加法运算
        /// </summary>
        /// <param name="x">x</param>
        /// <param name="y">y</param>
        /// <returns></returns>
        private static int Add(int x, int y)
        {
            int result = x + y;
            Console.WriteLine("x + y = {0}",result);
            return result;
        }

        /// <summary>
        /// 减法运算
        /// </summary>
        /// <param name="x">x</param>
        /// <param name="y">y</param>
        /// <returns></returns>
        private static int Sub(int x, int y)
        {
            int result = x - y;
            Console.WriteLine("x - y = {0}", result);
            return result;
        }

        static void Main(string[] args)
        {
            //声明一个委托对象
            OperationDelegate del = null;
            del += new OperationDelegate(Add);
            del += new OperationDelegate(Sub);

            Operator op = new Operator(5, 3);
            op.Operate(del);
            //Console.ReadLine();

            //去掉一个委托实例 
            del -= new OperationDelegate(Add);
            op.Operate(del);
            Console.ReadLine();
        }
    }

第一次在博客园里写东西，本人小菜，贴出来的东西只是为了印证学习的过程。

代码出处：

www.codefans.net    具体地址不详细