学步园

先拖一个NotifyIcon控件，注意：notifyIcon1.Icon=new Icon("Zipped 4.ico")图标文件路径及名字，否则抛异常

        public MainForm()
        {
            InitializeComponent();
            InitNotifyIcon();            
        }

        private void InitNotifyIcon()
        {
            MenuItem[] mi=new MenuItem[3];
            mi[0]=new MenuItem();
            mi[0].Text="显示";
            mi[0].Click+= new EventHandler(this.FormShow);        
            mi[1]=new MenuItem();
            mi[1].Text="-";    
            mi[2]=new MenuItem();
            mi[2].Text="退出";
            mi[2].Click+=new EventHandler(this.FormClose);    
            ContextMenu cm=new ContextMenu(mi);

            notifyIcon1.MouseDoubleClick+=new MouseEventHandler(notifyIcon1_MouseDoubleClick);
            notifyIcon1.Icon=new Icon("Zipped 4.ico");
            notifyIcon1.Text="已运行 - \\\\数据上报程序";
            notifyIcon1.Visible=true;
            notifyIcon1.ContextMenu=cm;
        }
        private void FormShow(object sender, EventArgs e)
        {
            this.Visible=true;
        }
        private void FormClose(object sender, EventArgs e)
        {
            this.Close();
        }
        
        private void notifyIcon1_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            this.Visible=true;
        }
        
        const int WM_SYSCOMMAND = 0x112;
        const int SC_CLOSE = 0xF060;
        const int SC_MINIMIZE = 0xF020;
        const int SC_MAXIMIZE = 0xF030;
        protected override void WndProc(ref Message m)
        {
            if(m.Msg==WM_SYSCOMMAND)
            {
                if(m.WParam.ToInt32()==SC_CLOSE)
                {
                    this.Visible=false;
                    return;
                }
                if(m.WParam.ToInt32()==SC_MINIMIZE)
                {
                    this.Visible=false;
                    return;
                }
            }
            base.WndProc(ref m);
        }