1 private void button1_Click(object sender, EventArgs e)
 2         {
 3             Form2 f = new Form2();
 4             //第一点：简洁
 5             //action and lambda
 6             f.alEmethod += (s => this.textBox1.Text = s);
 7             //delegate and method
 8             f.dmEmethod += delegate(String s){this.textBox1.Text = s;};
 9             f.ShowDialog();
10         }

 1 public partial class Form2 : Form
 2     {
 3         //第二点：复杂，冗余
 4         //使用Action和Lamdba
 5         public event Action<String> alEmethod;
 6 
 7         //使用自定义delegate和method
 8         public delegate void ChangeTextDelegate(String s);
 9         public event ChangeTextDelegate dmEmethod;
10 
11         public Form2()
12         {
13             InitializeComponent();
14         }
15 　　　　　// action 按钮
16         private void button1_Click(object sender, EventArgs e)
17         {
18             if(alEmethod!=null){
19                 alEmethod(this.textBox1.Text);
20             }
21         }
22 　　　　　// delegate 按钮
23         private void button2_Click(object sender, EventArgs e)
24         {
25             if(dmEmethod!=null){
26                 alEmethod(this.textBox1.Text);
27             }
28         }
29     }