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;

namespace Test1

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void Form1_Load(object sender, EventArgs e)

        {

        }

        private void 载入子窗口ToolStripMenuItem_Click(object sender, EventArgs e)

        {

            Form2 frm2 = new Form2();  //实例化 Form2

            frm2.MdiParent = this;      //设置MdiParent属性,将当前窗口作为父窗

            frm2.Show();   //使用show方法打开窗口

            Form3 frm3 = new Form3();

            frm3.MdiParent = this;

            frm3.Show();

            Form4 frm4 = new Form4();

            frm4.MdiParent = this;

            frm4.Show();

        }

        private void 水平平铺ToolStripMenuItem_Click(object sender, EventArgs e)

        {

            LayoutMdi(MdiLayout.TileHorizontal);

        }

        private void 垂直平铺ToolStripMenuItem_Click(object sender, EventArgs e)

        {

            LayoutMdi(MdiLayout.TileVertical);

        }

        private void 层叠排列ToolStripMenuItem_Click(object sender, EventArgs e)

        {

            LayoutMdi(MdiLayout.Cascade);

        }

    }

}







Form1.Designer



namespace Test1

{

    partial class Form1

    {

        /// <summary>

        /// 必需的设计器变量。

        /// </summary>

        private System.ComponentModel.IContainer components = null;

        /// <summary>

        /// 清理全部正在使用的资源。

        /// </summary>

        /// <param name="disposing">假设应释放托管资源，为 true；否则为 false。</param>

        protected override void Dispose(bool disposing)

        {

            if (disposing && (components != null))

            {

                components.Dispose();

            }

            base.Dispose(disposing);

        }

        #region Windows 窗口设计器生成的代码

        /// <summary>

        /// 设计器支持所需的方法 - 不要

        /// 使用代码编辑器改动此方法的内容。

        /// </summary>

        private void InitializeComponent()

        {

            this.components = new System.ComponentModel.Container();

            this.menuStrip1 = new System.Windows.Forms.MenuStrip();

            this.contextMenuStrip1 = new System.Windows.Forms.ContextMenuStrip(this.components);

            this.载入子窗口ToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();

            this.水平平铺ToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();

            this.垂直平铺ToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();

            this.层叠排列ToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();

            this.menuStrip1.SuspendLayout();

            this.SuspendLayout();

            //

            // menuStrip1

            //

            this.menuStrip1.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {

            this.载入子窗口ToolStripMenuItem,

            this.水平平铺ToolStripMenuItem,

            this.垂直平铺ToolStripMenuItem,

            this.层叠排列ToolStripMenuItem});

            this.menuStrip1.Location = new System.Drawing.Point(0, 0);

            this.menuStrip1.Name = "menuStrip1";

            this.menuStrip1.Size = new System.Drawing.Size(648, 25);

            this.menuStrip1.TabIndex = 1;

            this.menuStrip1.Text = "menuStrip1";

            //

            // contextMenuStrip1

            //

            this.contextMenuStrip1.Name = "contextMenuStrip1";

            this.contextMenuStrip1.Size = new System.Drawing.Size(61, 4);

            //

            // 载入子窗口ToolStripMenuItem

            //

            this.载入子窗口ToolStripMenuItem.Name = "载入子窗口ToolStripMenuItem";

            this.载入子窗口ToolStripMenuItem.Size = new System.Drawing.Size(80, 21);

            this.载入子窗口ToolStripMenuItem.Text = "载入子窗口";

            this.载入子窗口ToolStripMenuItem.Click += new System.EventHandler(this.载入子窗口ToolStripMenuItem_Click);

            //

            // 水平平铺ToolStripMenuItem

            //

            this.水平平铺ToolStripMenuItem.Name = "水平平铺ToolStripMenuItem";

            this.水平平铺ToolStripMenuItem.Size = new System.Drawing.Size(68, 21);

            this.水平平铺ToolStripMenuItem.Text = "水平平铺";

            this.水平平铺ToolStripMenuItem.Click += new System.EventHandler(this.水平平铺ToolStripMenuItem_Click);

            //

            // 垂直平铺ToolStripMenuItem

            //

            this.垂直平铺ToolStripMenuItem.Name = "垂直平铺ToolStripMenuItem";

            this.垂直平铺ToolStripMenuItem.Size = new System.Drawing.Size(68, 21);

            this.垂直平铺ToolStripMenuItem.Text = "垂直平铺";

            this.垂直平铺ToolStripMenuItem.Click += new System.EventHandler(this.垂直平铺ToolStripMenuItem_Click);

            //

            // 层叠排列ToolStripMenuItem

            //

            this.层叠排列ToolStripMenuItem.Name = "层叠排列ToolStripMenuItem";

            this.层叠排列ToolStripMenuItem.Size = new System.Drawing.Size(68, 21);

            this.层叠排列ToolStripMenuItem.Text = "层叠排列";

            this.层叠排列ToolStripMenuItem.Click += new System.EventHandler(this.层叠排列ToolStripMenuItem_Click);

            //

            // Form1

            //

            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);

            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;

            this.BackColor = System.Drawing.SystemColors.Window;

            this.ClientSize = new System.Drawing.Size(648, 309);

            this.Controls.Add(this.menuStrip1);

            this.IsMdiContainer = true;

            this.MainMenuStrip = this.menuStrip1;

            this.Name = "Form1";

            this.Text = "Form1";

            this.Load += new System.EventHandler(this.Form1_Load);

            this.menuStrip1.ResumeLayout(false);

            this.menuStrip1.PerformLayout();

            this.ResumeLayout(false);

            this.PerformLayout();

        }

        #endregion

        private System.Windows.Forms.MenuStrip menuStrip1;

        private System.Windows.Forms.ToolStripMenuItem 载入子窗口ToolStripMenuItem;

        private System.Windows.Forms.ToolStripMenuItem 水平平铺ToolStripMenuItem;

        private System.Windows.Forms.ToolStripMenuItem 垂直平铺ToolStripMenuItem;

        private System.Windows.Forms.ToolStripMenuItem 层叠排列ToolStripMenuItem;

        private System.Windows.Forms.ContextMenuStrip contextMenuStrip1;

    }

}



Form2.cs  Form3.Cs Form4.cs 为默认值