将程序最小化到系统托盘

1.添加一个NotifyIcon控件

2.绑定控件的单击和双击事件

        /// <summary>
        /// 单击事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void notifyIcon1_Click(object sender, EventArgs e)
        {
            this.Visible = false;
            notifyIcon1.Visible = true;
            this.TopMost = false;
        }
        /// <summary>
        /// 双击事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void notifyIcon1_DoubleClick(object sender, EventArgs e)
        {
            this.Visible = true;
            this.WindowState = FormWindowState.Normal;
            this.TopMost = true;
            notifyIcon1.Visible = true;
        }
        /// <summary>
        /// 重设大小
        /// </summary>
        /// <param name="e"></param>
        protected override void OnResize(EventArgs e)
        {
            if (WindowState == FormWindowState.Maximized)
            {
                //最大化时所需的操作 ;
                this.Visible = true;
                notifyIcon1.Visible = true;
            }
            else if (this.WindowState == FormWindowState.Minimized)
            {
                //最小化时所需的操作
                this.Visible = false  ;
                notifyIcon1.Visible = true;
                this.TopMost = false;
            }
        }

3.设置控件的Icon属性（任务栏显示的图标）和Text属性（鼠标放在拖盘上显示的文字提示）