系统最小化到托盘

        private void Form1_Load(object sender, EventArgs e)
        {
            //指定托盘图标
            this.notifyIcon1.Icon = new System.Drawing.Icon("C:\\Users\\Administrator\\Desktop\\11.ico");
            //5000:托盘图标显示5秒
            //标题为"系统提示"
            //内容为"系统正在运行"
            //ToolTipIcon.Info:提示标志为通知
            this.notifyIcon1.ShowBalloonTip(5000, "系统提示", "程序正在运行~~~", ToolTipIcon.Info);
        }

        //窗体关闭事件
        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            //取消关闭事件
            e.Cancel = true;
            //窗体最下化
            this.WindowState = FormWindowState.Minimized;
            //隐藏窗体
            this.Hide();
            
        }

        //托盘图标双击事件
        private void notifyIcon1_DoubleClick(object sender, EventArgs e)
        {
            //窗体正常显示，则隐藏窗体
            if (this.WindowState == FormWindowState.Normal)
            {
                this.WindowState = FormWindowState.Minimized;
                this.Hide();
            }
            //窗体最下化，则显示窗体
            else if (this.WindowState == FormWindowState.Minimized)
            {
                this.Show();
                this.WindowState = FormWindowState.Normal;
                this.Activate();

            }
        }

        //窗体大小变化事件
        private void Form1_SizeChanged(object sender, EventArgs e)
        {
            //如果窗体最下化则显示窗体
            if (this.WindowState == FormWindowState.Minimized)
            {
                //设置窗体为正常显示
                this.Show();
                this.Activate();
            }
        }