C# 非模态窗体（show）实现模态窗体（ShowDialog）的效果

模态窗体（ShowDialog）打开后，后面的主窗体就不能做任何操作了。

本博客要实现非模态窗体（show）实现模态窗体（ShowDialog）的一些效果（主窗体关闭，子窗体也要关闭。子窗体只能打开一个。）

同时，保留非模态窗体的一些特性（主窗体和子窗体都能操作，比如文本的书写等）。

现实的一些用处：

1、比如要在主窗体中写已有的内容，用子窗体显示这些已有的内容（一般信息比较多，无法在主窗体中用某个空间显示完全）以供参考。

2、直接点击子窗体中的信息，在主窗体中显示出来。

等等

代码如下：

FormA----主窗体

FormB----子窗体

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace BasicWindowsApplication
{
public partial class FormA : Form
{
FormB formB = null;

public FormA()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
if (formB == null)
{
formB = new FormB(this);//这一步很重要
formB.CloseFrm += new EventHandler(frmA_CloseFrm);
formB.Show();
}
else
{
formB.TopMost = true;
}

}

/// <summary>
/// 窗体关闭事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
public void frmA_CloseFrm(object sender, EventArgs e)
{
formB = null;
}

/// <summary>
/// 窗体关闭事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void FrmA_FormClosed(object sender, FormClosedEventArgs e)
{
if (formB != null)
{
formB.Dispose();
}
}
}
}
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace BasicWindowsApplication
{
public partial class FormA : Form
{
FormB formB = null;

public FormA()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
if (formB == null)
{
formB = new FormB(this);//这一步很重要
formB.CloseFrm += new EventHandler(frmA_CloseFrm);
formB.Show();
}
else
{
formB.TopMost = true;
}

}

/// <summary>
/// 窗体关闭事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
public void frmA_CloseFrm(object sender, EventArgs e)
{
formB = null;
}

/// <summary>
/// 窗体关闭事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void FrmA_FormClosed(object sender, FormClosedEventArgs e)
{
if (formB != null)
{
formB.Dispose();
}
}
}
}

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace BasicWindowsApplication
{
public partial class FormB : Form
{
FormA formA;
public event EventHandler CloseFrm;

public FormB(FormA frm)
{
formA = frm;
InitializeComponent();
this.FormClosed += new FormClosedEventHandler(FrmB_FormClosed);
}

/// <summary>
/// 窗体关闭事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
void FrmB_FormClosed(object sender, FormClosedEventArgs e)
{
if (CloseFrm != null)
{
CloseFrm(sender, e);
}
}
}
}
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace BasicWindowsApplication
{
public partial class FormB : Form
{
FormA formA;
public event EventHandler CloseFrm;

public FormB(FormA frm)
{
formA = frm;
InitializeComponent();
this.FormClosed += new FormClosedEventHandler(FrmB_FormClosed);
}

/// <summary>
/// 窗体关闭事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
void FrmB_FormClosed(object sender, FormClosedEventArgs e)
{
if (CloseFrm != null)
{
CloseFrm(sender, e);
}
}
}
}

MainForm为了显示主窗体（FormA）关闭，子窗体（FormB）也关闭。

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public partial class MainForm: Form
{
public MainForm()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
FormA formA = new FormA();
formA.ShowDialog();
}
}
public partial class MainForm: Form
{
public MainForm()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
FormA formA = new FormA();
formA.ShowDialog();
}
}

摘自红色黑客联盟(www.7747.net) 原文：http://www.7747.net/kf/201007/52817.html