C# 可折叠导航

1. using System;  
2. using System.Collections.Generic;  
3. using System.ComponentModel;  
4. using System.Data;  
5. using System.Drawing;  
6. using System.Linq;  
7. using System.Text;  
8. using System.Windows.Forms;  
9.   
10. namespace WindowsFormsApplication2  
11. {  
12.     public partial class Form1 : Form  
13.     {  
14.         public Form1()  
15.         {  
16.             InitializeComponent();  
17.         }  
18.         private Font ft = new Font("黑体",12);  
19.         private static Panel iPanel= new Panel();  
20.         private static PictureBox iPict =new PictureBox();  
21.   
22.         private void Form1_Load(object sender, EventArgs e)  
23.         {  
24.             pictureBox1.Image = global::WindowsFormsApplication2.Properties.Resources.朝上按钮;  
25.             pictureBox1.Size = global::WindowsFormsApplication2.Properties.Resources.朝上按钮.Size;  
26.             pictureBox2.Image = global::WindowsFormsApplication2.Properties.Resources.朝上按钮;  
27.             pictureBox2.Size = global::WindowsFormsApplication2.Properties.Resources.朝上按钮.Size;  
28.             ft = label1.Font;  
29.         }  
30.   
31.         private void label1_MouseEnter(object sender, EventArgs e)  
32.         {  
33.             ((Label)sender).ForeColor = Color.Red;//设置控件文字字颜色  
34.             ((Label)sender).Font = new Font(ft, ft.Style | FontStyle.Underline);//设置控件字体  
35.         }  
36.   
37.         private void label1_MouseLeave(object sender, EventArgs e)  
38.         {  
39.             ((Label)sender).ForeColor = Color.Black;//设置控件文字颜色  
40.             ((Label)sender).Font = new Font(ft, ft.Style); //设置控件字体  
41.         }  
42.   
43.         private void pictureBox1_Click(object sender, EventArgs e)  
44.         {  
45.             int i = Convert.ToInt16(((PictureBox)sender).Tag.ToString());  
46.             switch (i)  
47.             {  
48.                 case 1:  
49.                     iPanel = panel2_1;  
50.                     iPict = pictureBox1;  
51.                     break;  
52.                 case 2:  
53.                     iPanel = panel2_2;  
54.                     iPict = pictureBox2;  
55.                     break;  
56.             }  
57.   
58.             if (Convert.ToInt16(iPanel.Tag.ToString()) == 1)  
59.             {  
60.                 iPanel.Tag = 2;  
61.                 iPict.Image = Properties.Resources.朝上按钮;  
62.                 iPanel.Visible = true;  
63.             }  
64.             else  
65.             {  
66.                 iPanel.Tag = 1;  
67.                 iPict.Image = Properties.Resources.朝下按钮;  
68.                 iPanel.Visible = false;  
69.             }  
70.         }  
71.     }  
72. }  

转载自：http://blog.youkuaiyun.com/mghc00100/article/details/7821732http://blog.youkuaiyun.com/mghc00100/article/details/7821732

另可参考：http://blog.youkuaiyun.com/bdmh/article/details/7549140