24.委托(1)

1. 简单的delegate(小王吃西瓜... ...)

 

namespace _24.委托_1_
{

    delegate void Eat(string food);
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        static void xwEat(string food)
        {
            MessageBox.Show("小王吃" + food);
        }
        private void Form1_Load(object sender, EventArgs e)
        {

            Eat xw = new Eat(xwEat);
            xw("西瓜");
            //  xwEat("西瓜");
        }
    }

}

2. 接着上面的继续扩展

namespace _24.委托_1_
{

    delegate void Eat(string food);
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        static void xwEat(string food)
        {
            MessageBox.Show("小王吃" + food);
        }
        static void xlEat(string food)
        {
            MessageBox.Show("小李吃" + food);
        }
        static void xzEat(string food)
        {
            MessageBox.Show("小赵吃" + food);
        }
        private void Form1_Load(object sender, EventArgs e)
        {

            Eat xw = new Eat(xwEat);
            Eat xl = new Eat(xlEat);
            Eat xz = new Eat(xzEat);
            xw("西瓜");
            xl("西瓜");
            xz("西瓜");
            //  xwEat("西瓜");
        }
    }

}

3. 接着上面的继续扩展

namespace _24.委托_1_
{

    delegate void Eat(string food);
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        static void xwEat(string food)
        {
            MessageBox.Show("小王吃" + food);
        }
        static void xlEat(string food)
        {
            MessageBox.Show("小李吃" + food);
        }
        static void xzEat(string food)
        {
            MessageBox.Show("小赵吃" + food);
        }
        private void Form1_Load(object sender, EventArgs e)
        {

            Eat xw = new Eat(xwEat);
            Eat xl = new Eat(xlEat);
            Eat xz = new Eat(xzEat);
            Eat EatChain;
            EatChain = xw + xl + xz;
            EatChain("西瓜");
           
        }
    }

}

4. 接着上面的继续扩展

namespace _24.委托_1_
{

    delegate void Eat(string food);
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        static void xwEat(string food)
        {
            MessageBox.Show("小王吃" + food);
        }
        static void xlEat(string food)
        {
            MessageBox.Show("小李吃" + food);
        }
        static void xzEat(string food)
        {
            MessageBox.Show("小赵吃" + food);
        }
        private void Form1_Load(object sender, EventArgs e)
        {

            Eat xw = new Eat(xwEat);
            Eat xl = new Eat(xlEat);
            Eat xz = new Eat(xzEat);
            Eat EatChain;
            MessageBox.Show("三人开会");
            EatChain = xw + xl + xz;
            EatChain("西瓜");
            MessageBox.Show("小王出去接电话");
            EatChain -= xw;
            EatChain("葡萄 ");
            MessageBox.Show("小王回来和大家一起吃橘子");
            EatChain += xw;
            EatChain("橘子");
           
        }
    }

}

5. 接着上面的继续扩展

namespace _24.委托_1_
{

    delegate void Eat(string food);
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            Eat eatChain = null;
            eatChain += delegate(string food)
            {
                MessageBox.Show("小王吃" + food);
            };
            eatChain += delegate(string food)
            {
                MessageBox.Show("小赵吃" + food);
            };
            eatChain("西瓜");

        }
    }

}