1 using System;
 2 using System.Windows.Forms;
 3 
 4 namespace WindowsFormsApplication2
 5 {
 6     public partial class Form1 : Form
 7     {
 8         public Form1()
 9         {
10             InitializeComponent();
11 
12             // 在引发buttonOne的Click事件时，应执行Button_Click方法，使用+=运算符把新方法添加到委托列表中
13             buttonOne.Click += new EventHandler(Button_Click);
14             buttonTwo.Click += new EventHandler(Button_Click);
15             buttonTwo.Click += new EventHandler(button2_Click);
16         }
17 
18         // 委托要求添加到委托列表中的所有方法都必须有相同的签名
19         private void Button_Click(object sender, EventArgs e)
20         {
21             if (((Button)sender).Name == "buttonOne")
22             {
23                 labelInfo.Text = "Button one was pressed.";
24             }
25             else
26             {
27                 labelInfo.Text = "Button two was pressed.";
28             }
29         }
30 
31         private void button2_Click(object sender, EventArgs e)
32         {
33             MessageBox.Show("This only happens in Button two click event");
34         }
35     }
36 }

 1 using System;
 2 using System.Windows.Forms;
 3 
 4 namespace WindowsFormsApplication2
 5 {
 6     public partial class Form1 : Form
 7     {
 8         public Form1()
 9         {
10             InitializeComponent();
11             buttonOne.Click += (sender, e) => labelInfo.Text = "Button one was pressed";
12             buttonTwo.Click += (sender, e) => labelInfo.Text = "Button two was pressed";
13             buttonTwo.Click += (sender, e) =>
14                 {
15                     MessageBox.Show("This only happens in Button2 click event");
16                 };
17         }
18     }
19 }