要实现保存最近打开过的文件。可以将菜单中最近打开过的文件名和路径事先保存到事先建立好的*.ini文件中。系统启动时读取ini文件中 读数据建立数组菜单，即可以实现这种效果

界面效果如图：

关键代码如下：

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

namespace WindowsApplication3
{
    public partial class Form6 : Form
    {
        string address;
        public Form6()
        {
            InitializeComponent();
            address = System.Environment.CurrentDirectory;
        }

        private void 打开ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            openFileDialog1.FileName = "";
            this.openFileDialog1.ShowDialog();
            StreamWriter s = new StreamWriter(address + "\\Menu.ini", true);
            s.WriteLine(openFileDialog1.FileName);//写入ini文件
            s.Flush();
            s.Close();
            //ShowWithoutActivation(openFileDialog1.FileName);
            ShowWindows(openFileDialog1.FileName);
        }

        private void Form6_Load(object sender, EventArgs e)//将ini文件的内容加入到菜单
        {
            StreamReader sr = new StreamReader(address + "\\Menu.ini");
            int i = this.文件ToolStripMenuItem.DropDownItems.Count - 2;
            while (sr.Peek() >= 0)//读取ini文件
            {
                ToolStripMenuItem menuitem = new ToolStripMenuItem(sr.ReadLine());
                this.文件ToolStripMenuItem.DropDownItems.Insert(i, menuitem);
                i++;
                menuitem.Click+=new EventHandler(menuitem_Click);
            }
            sr.Close();
        }

        public void ShowWindows(string fileName)
        {
            Image p = Image.FromFile(fileName);
            Form f = new Form();
            f.MdiParent = this;
            f.BackgroundImage = p;
            f.Show();
        }

        private void menuitem_Click(object sender, EventArgs e)
        {
            ToolStripMenuItem mune = (ToolStripMenuItem)sender;
            ShowWindows(mune.Text);
        }
    }
}

效果图：

 

 

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