在开发中实例研究MDI和子窗口应用（MIS项目）

实例：

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

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

        private bool HaveOpened(Form MainMDI, string ParentMDI)
        {
            //查看窗口是否已经被打开
            bool bReturn = true;
            for (int i = 0; i < MainMDI.MdiChildren.Length; i++)
            {
                if (MainMDI.MdiChildren[i].Name == ParentMDI)
                {
                    MainMDI.MdiChildren[i].BringToFront();
                    bReturn = false;
                    break;
                }
            }
            return bReturn;
        }

        private void CascadeToolStripMenuItem_Click(object sender, EventArgs e)
        {
            LayoutMdi(MdiLayout.Cascade);
        }

        private void TileVerticalToolStripMenuItem_Click(object sender, EventArgs e)
        {
            LayoutMdi(MdiLayout.TileVertical);
        }

        private void TileHorizontalToolStripMenuItem_Click(object sender, EventArgs e)
        {
            LayoutMdi(MdiLayout.TileHorizontal);
        }

        private void CloseAllToolStripMenuItem_Click(object sender, EventArgs e)
        {
            foreach (Form childForm in MdiChildren)
            {
                childForm.Close();
            }
        }

        private void MiniAllToolStripMenuItem_Click(object sender, EventArgs e)
        {

        }

        private void ExitToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Application.ExitThread();
        }

        private void AboutThisToolStripMenuItem_Click(object sender, EventArgs e)
        {
            AboutBox at = new AboutBox();
            at.Show();
        }

        private void menuStrip1_ItemClicked(object sender, ToolStripItemClickedEventArgs e)
        {
        }

        private void MISMain_Load(object sender, EventArgs e)
        {
            //获取当前系统封装版本  toolStripStatusLabel1
            this.toolStripStatusLabel1.Text = "版本: " +Environment.AssemblyVersion;
            //动态显示当前时间   toolStripStatusLabel2
            this.toolStripStatusLabel2.Text = DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss");
            this.timer1.Interval = 1000;
            this.timer1.Start();
            //从全局静态类中得到传递过来的变量UserName  toolStripStatusLabel4
            this.toolStripStatusLabel4.Text = "登录用户："+ GlobalInfo.LoginUser;
            //toolStripStatusLabel5得到系统封装程序集系统名称
            this.toolStripStatusLabel5.Text =Environment.AssemblyProduct;
            //toolStripStatusLabel6 用于显示授权信息
            this.toolStripStatusLabel6.Text = "授权给：" + Environment.AssemblyCompany;
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            this.toolStripStatusLabel2.Text = DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss");
        }

        private void 密码更改ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            PwdModify f1 = new PwdModify();
            if (HaveOpened(this, "PwdModify"))
            {
                f1.MdiParent = this;
                f1.Show();
            }
        }

        private void 注册用户ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            RegisterAccount f1 = new RegisterAccount();
            if (HaveOpened(this, "RegisterAccount"))
            {
                f1.MdiParent = this;
                f1.Show();
            }
        }

        private void 考勤报表查询ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            reportview f1 = new reportview();
            if (HaveOpened(this, "reportview"))
            {
                f1.MdiParent = this;
                f1.Show();
            }
        }

        private void databaseConfigToolStripMenuItem_Click(object sender, EventArgs e)
        {
            ServerConfig f1 = new ServerConfig();
            if (HaveOpened(this, "ServerConfig"))
            {
                f1.MdiParent = this;
                f1.Show();
            }
        }

        private void UsersToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Userlist f1 = new Userlist();
            if(HaveOpened(this,"Userlist"))
            {
                f1.MdiParent = this;
                f1.Show();
            }
        }

        private void AttendviewToolStripMenuItem_Click(object sender, EventArgs e)
        {
            AttendView f1 = new AttendView();
            if (HaveOpened(this, "AttendView"))
            {
                f1.MdiParent = this;
                f1.Show();
            }
        }
    }
}