c#中对mdi的操作源码

内容:
child.cs
------------------------------------------------------------

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;

namespace testagain
{
/// <summary>
/// Summary description for child.
/// </summary>
public class child : System.Windows.Forms.Form
{
private System.Windows.Forms.Label lbl_about;
private System.Windows.Forms.Label label1;
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.Container components
= null;

public child(Form f_MainForm)
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
this.MdiParent = f_MainForm;

//
// TODO: Add any constructor code after
InitializeComponent call
//
}

/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if(components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}

#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not
modify
/// the contents of this method with the code
editor.
/// </summary>
private void InitializeComponent()
{
this.lbl_about = new System.Windows.Forms.Label
();
this.label1 = new System.Windows.Forms.Label();
this.SuspendLayout();
//
// lbl_about
//
this.lbl_about.Font = new System.Drawing.Font
("黑体", 24F, System.Drawing.FontStyle.Regular,
System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
this.lbl_about.Location = new
System.Drawing.Point(56, 48);
this.lbl_about.Name = "lbl_about";
this.lbl_about.Size = new System.Drawing.Size
(344, 40);
this.lbl_about.TabIndex = 0;
this.lbl_about.Text = "MDI窗体操作演示示例";
//
// label1
//
this.label1.Location = new System.Drawing.Point
(312, 112);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(136,
16);
this.label1.TabIndex = 1;
this.label1.Text = "东方蜘蛛2001-7-1";
//
// child
//
this.AutoScaleBaseSize = new System.Drawing.Size
(6, 14);
this.ClientSize = new System.Drawing.Size(536,
329);
this.Controls.AddRange(new
System.Windows.Forms.Control[] {

this.label1,

this.lbl_about});
this.Name = "child";
this.StartPosition =
System.Windows.Forms.FormStartPosition.CenterParent;
this.Text = "MDI窗体操作演示_子窗体";
this.WindowState =
System.Windows.Forms.FormWindowState.Maximized;
this.ResumeLayout(false);

}
#endregion
}
}