c#创建子窗口时，子窗口无法获得焦点，总出现在父窗口控件的后面……

Question

调用子窗口代码：
namespace experiment
{
public partial class Form1 : Form
{
public Form1()
{
this.IsMdiContainer = true;
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{

Form2 frm = new Form2();
frm.MdiParent = this;
frm.Show();
frm.Focus();
}
}
}

Answer 1

在private void InitializeComponent()中加入
this.LostFocus+=new EventHandler(Form1_LostFocus);

然后写Form1_LostFocus方法:

private void Form1_LostFocus(object sender, EventArgs e)
{
this.Close();
}

以下是全部代码(2003中):
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace WindowsApplication1
{
/// <summary>
/// Summary description for Form1.
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.Container components = null;

public Form1()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();

//
// 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.components = new System.ComponentModel.Container();
this.Size = new System.Drawing.Size(300,300);
this.Text = "Form1";
this.LostFocus+=new EventHandler(Form1_LostFocus);
}
#endregion

/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}

private void Form1_LostFocus(object sender, EventArgs e)
{
this.Close();
}
}
}

追问

按照前面说的改过之后，子窗口仍然在父窗口后面，而且一闪就关闭了……