给你的MDI程序加上一个标签栏,方便地切换和关闭子窗体

效果如下图所示，应该说还不错吧，菜单简陋了一点，不过你可以根据自己的需要扩充。
因为能力有限，没能实现给当前的TabPage加一些修饰，不像专业软件那么漂亮，不过还能凑合用^_^



做法如下：
首先创建一个MDI子窗口的基类

using System;using System.Drawing;using System.Collections;using System.ComponentModel;using System.Windows.Forms;namespace ECHaierHR.Common{    /// <summary>    /// MDIChild 的摘要说明。    /// </summary>    public class MDIChild : System.Windows.Forms.Form    {        /// <summary>        /// 必需的设计器变量。        /// </summary>        private System.ComponentModel.Container components = null;        private TabControl tabCtrl;        private TabPage tabPag;        public MDIChild()        {            //            // Windows 窗体设计器支持所必需的            //            InitializeComponent();            //            // TODO: 在 InitializeComponent 调用后添加任何构造函数代码            //        }        /// <summary>        /// 清理所有正在使用的资源。        /// </summary>        protected override void Dispose(bool disposing)        {            if (disposing)            {                if (components != null)                {                    components.Dispose();                }            }            base.Dispose(disposing);        }        #region Windows 窗体设计器生成的代码        /// <summary>        /// 设计器支持所需的方法 - 不要使用代码编辑器修改        /// 此方法的内容。        /// </summary>        private void InitializeComponent()        {            //             // MDIChild            //             this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);            this.ClientSize = new System.Drawing.Size(292, 273);            this.Name = "MDIChild";            this.Text = "MDIChild";            this.Closing += new System.ComponentModel.CancelEventHandler(this.MDIChild_Closing);            this.Activated += new System.EventHandler(this.MDIChild_Activated);        }        #endregion        private void MDIChild_Closing(object sender, System.ComponentModel.CancelEventArgs e)        {            //Destroy the corresponding Tabpage when closing MDI child form            if (this.tabPag != null)                this.tabPag.Dispose();            //If no Tabpage left            if (this.tabCtrl != null && !tabCtrl.HasChildren)            {                tabCtrl.Visible = false;            }        }        private void MDIChild_Activated(object sender, System.EventArgs e)        {            //Activate the corresponding Tabpage            tabCtrl.SelectedTab = tabPag;            if (!tabCtrl.Visible)            {                tabCtrl.Visible = true;            }        }        public TabControl TabCtrl        {            set { this.tabCtrl = value; }        }        public TabPage TabPag        {            get { return this.tabPag; }            set { this.tabPag = value; }        }    }}

然后，在MDI的主窗体中拖上一个TabControl，加入一下代码

#region 把MDI窗口与TabControl关联并加入快捷菜单private void tabControl1_SelectedIndexChanged(object sender, System.EventArgs e){    foreach (MDIChild childForm in this.MdiChildren)    {        //Check for its corresponding MDI child form        if (childForm.TabPag.Equals(tabControl1.SelectedTab))        {            //Activate the MDI child form            childForm.Select();        }    }}private void AddMDIChildToTabCtrl(MDIChild frmChild){    frmChild.MdiParent = this;    //child Form will now hold a reference value to the tab control    frmChild.TabCtrl = tabControl1;    //Add a Tabpage and enables it    TabPage tp = new TabPage();    tp.Parent = tabControl1;    tp.Text = frmChild.Text;    tp.Show();    //child Form will now hold a reference value to a tabpage    frmChild.TabPag = tp;    frmChild.Show();}private void ctxmnuClose_Click(object sender, System.EventArgs e){    if (this.tabControl1.Visible)    {        MDIChild childForm = (MDIChild) this.ActiveMdiChild;        childForm.Close();    }}private void tabControl1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e){    if (e.Button == MouseButtons.Right)    {        Rectangle rct;        for (int i = 0; i < tabControl1.TabPages.Count; i++)        {            rct = tabControl1.GetTabRect(i);            if (rct.Contains(e.X, e.Y))            {                //tabControl1.SelectedIndex = i;                tabControl1.SelectedTab = tabControl1.TabPages[i];                break;            }        }    }}#endregion

最后，在创建MDI窗口对象时，把它放进TabControl就行了

Employee emp = new Employee();this.AddMDIChildToTabCtrl(emp);