原文：http://blog.csdn.net/lan_liang/article/details/7697742

單擊工作列  顯示-隱藏切換，右鍵選單，捕捉關閉窗體事件

1. public partial class frmMain : Form  
2.    {  
3.        public frmMain()  
4.        {  
5.            InitializeComponent();  
6.        }  
7.        #region 登出
8.        publicvoid Logout()  
9.        {  
10.            if (MessageBox.Show("確認要退出嗎？", "提示", MessageBoxButtons.OKCancel) == DialogResult.OK)  
11.            {  
12.                notifyIcon1.Visible = false;  
13.                FormCollection fc = Application.OpenForms;  
14.                if (fc != null && fc.Count > 0)  
15.                {  
16.                    foreach
     (Form window in fc)  
17.                    {  
18.                        window.Hide();  
19.                    }  
20.                }  
21.                CacheHelper.CurrentUsrName = "";  
22.                CacheHelper.CurrentRoleId = 0;  
23.                frmLogin fl = new frmLogin();  
24.                fl.Show();  
25.            }  
26.        }  
27.        privatevoid 登出登陸ToolStripMenuItem_Click(object sender, EventArgs e)  
28.        {  
29.            Logout();  
30.        }  
31.        #endregion
32.        #region 修改密碼
33.        privatevoid 修改密碼ToolStripMenuItem_Click(object sender, EventArgs e)  
34.        {  
35.            frmChangePwd fcp = new frmChangePwd();  
36.            fcp.Show();  
37.        }  
38.        #endregion
39.        privatevoid frmMain_Load(object sender, EventArgs e)  
40.        {  
41.        }  
42.        privatevoid frmMain_FormClosing(object sender, FormClosingEventArgs e)  
43.        {  
44.            if (MessageBox.Show("確認要退出嗎？", "提示", MessageBoxButtons.OKCancel) == DialogResult.OK)  
45.            {  
46.                Logout();  
47.            }  
48.            else
49.            {  
50.                e.Cancel = true;  
51.            }  
52.        }  
53.        privatevoid 最大化ToolStripMenuItem_Click(object sender, EventArgs e)  
54.        {  
55.            ShowWin();  
56.        }  
57.        privatevoid 退出ToolStripMenuItem_Click(object sender, EventArgs e)  
58.        {  
59.            Logout();  
60.        }  
61.        privatevoid frmMain_SizeChanged(object sender, EventArgs e)  
62.        {  
63.            if (this.WindowState == FormWindowState.Minimized)  
64.            {  
65.                HideWin();  
66.            }  
67.        }  
68.        privatevoid notifyIcon1_MouseClick(object sender, MouseEventArgs e)  
69.        {  
70.            if (e.Button == MouseButtons.Right)  
71.            {  
72.                contextMenuStrip1.Show(MousePosition.X, MousePosition.Y);  
73.            }  
74.            else
75.            {  
76.                ShowWin();  
77.            }  
78.        }  
79.        #region 隱藏顯示窗體
80.        /// <summary>
81.        /// 隱藏窗體
82.        /// </summary>
83.        privatevoid HideWin()  
84.        {  
85.            this.notifyIcon1.Visible = true;  
86.            this.Hide();  
87.        }  
88.        /// <summary>
89.        /// 顯示主窗體
90.        /// </summary>
91.        privatevoid ShowWin()  
92.        {  
93.            if (Visible)  
94.            {  
95.                HideWin();  
96.            }  
97.            else
98.            {  
99.                /////這裡注意順序很重要，先show 後設置state
100.                Show();  
101.                WindowState = FormWindowState.Normal;  
102.            }  
103.        }  
104.        #endregion
105.    }