MdiLayout枚举成员及说明

Casecade	s全部Mdi层叠在父窗体
TileHorizontal	水平平铺
TitleVertical	垂直平铺

Form1.cs (mdi)

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    {        /// 
        /// 必需的设计器变量。        /// 
        private System.ComponentModel.IContainer components = null;        /// 
        /// 清理全部正在使用的资源。        /// 
        /// 假设应释放托管资源，为 true；否则为 false。        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        /// 
        /// 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。        /// 
        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