左侧收缩菜单

 1         int panel1Height = 25;
 2         int panel2Height = 200;
 3         int panel3Height = 25;
 4         int panel4Height = 150;
 5         int panel5Height = 25;
 6         int panel6Height = 100;
 7         private void panel1_Click(object sender, EventArgs e)
 8         {
 9             if (panel2.Visible == true) //已显示容器2，需要隐藏容器2
10             {
11                 panel2.Visible = false; //隐藏容器2，容器3和容器5就要移动到容器1之下
12                 panel3.Top = panel1Height; //容器3移动到容器1之下
13                 panel5.Top = panel1Height + panel3Height; //把容器5移动到容器3下
14             }
15             else
16             { //已隐藏容器2，需要显示容器2
17                 panel2.Visible = true; //显示容器2
18                 panel2.Top = panel1Height; //容器2放在容器1之下
19                 panel3.Top = panel1Height + panel2Height; //容器3放在容器2之下
20                 panel4.Visible = false;
21                 panel6.Visible = false;
22                 panel5.Top = panel1Height + panel2Height + panel3Height; //把容器5让在容器3之下
23             }
24         }
25 
26         private void panel3_Click(object sender, EventArgs e)
27         {
28             panel3.Top = panel1Height;
29             if (panel4.Visible == true)
30             {
31                 panel4.Visible = false;
32                 panel5.Top = panel1Height + panel3Height;
33             }
34             else
35             {
36                 panel4.Visible = true;
37                 panel2.Visible = false;
38                 panel6.Visible = false;
39                 panel4.Top = panel1Height + panel3Height;
40                 panel5.Top = panel1Height + panel3Height + panel4Height;
41             }
42         }
43 
44         private void panel5_Click(object sender, EventArgs e)
45         {
46             panel3.Top = panel1Height;
47             panel5.Top = panel1Height + panel3Height;
48             if (panel6.Visible == true)
49             {
50                 panel6.Visible = false;
51             }
52             else
53             {
54                 panel6.Visible = true;
55                 panel2.Visible = false;
56                 panel4.Visible = false;
57                 panel6.Top = panel1Height + panel3Height + panel5Height;
58             }
59         }

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原文地址：https://www.cnblogs.com/jmy9/p/10795598.html