Delegate (C# VS2005)备忘的 -_-

1.

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;

namespace DelegateDemo
{
   public class DelegateClass
    {
        //public static int Add(int x,int y)
        //{
        //    return x + y;
        //}
        //public static int Multiply(int x,int y)
        //{
        //    return x * y;
        //}
       public static void Add(int x, int y)
       {
           int addResult = x + y;
           MessageBox.Show(addResult+"");
       }
       public static void Multiply(int x, int y)
       {
           int mulResult = x * y;
           MessageBox.Show(mulResult+"");
       }
    }
}

2.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace DelegateDemo
{
    public partial class MainForm : Form
    {
        public MainForm()
        {
            InitializeComponent();
        }
        //public delegate int MyDelegate(int x,int y);
        public delegate void MulDelegate(int x,int y);
        private void bt_First_Click(object sender, EventArgs e)
        {
            //MyDelegate dele = new MyDelegate(DelegateClass.Add);
            //int addResult = dele(5, 5);
            //MessageBox.Show(addResult+"");
            //MyDelegate dele2 = new MyDelegate(DelegateClass.Multiply);
            //int multiplyResult = dele2(2 , 3);
            //MessageBox.Show(multiplyResult+"");
            MulDelegate mul = new MulDelegate(DelegateClass.Add);
            mul += new MulDelegate(DelegateClass.Multiply);
            mul(4, 7);
            mul -= new MulDelegate(DelegateClass.Add);
            mul(7, 7);
        }

    }
}