c#中窗体实现隐藏,任务栏为什么无图标?再怎样弹出显示?

建立一个 contextMenu1 上面有4个菜单项,miShowWindow,miShowIcon,miShowAll,miExit
然后设置主窗体和notifyIcon(此处实例是ni)的contextMenu为此contextMenu1，单击菜单可以看到效果，如果最小化也要推到托盘的话，可能要用到其它事件

.................................................................
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace Notify
{
    public partial class Notify : Form
    {
        public Notify()
        {
            InitializeComponent();
        }

        private void miShowWindow_Click(object sender, EventArgs e)
        {
            //显示窗体
            this.Visible = true;
            this.ni.Visible = false;
        }

        private void miShowAll_Click(object sender, EventArgs e)
        {
            //显示全部
            this.Visible = true;
            this.ni.Visible = true;
        }

        private void miShowIcon_Click(object sender, EventArgs e)
        {
            //显示托盘
            this.Visible = false;
            this.ni.Visible = true;
        }

        private void miExit_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        private void ni_Click(object sender, EventArgs e)
        {
            //显示托盘
            miShowWindow_Click(sender, e);
        }
    }
}