Hi Terry,
Here is a simple example. I tried to make it as short as I could.
//*************************************
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
namespace WindowsApplication4
{
/// <summary>
/// Summary description for Form1.
/// </summary>
public class MainForm : System.Windows.Forms.Form
{
private System.Windows.Forms.MainMenu mainMenu1;
private System.Windows.Forms.MenuItem menuItem1;
private System.Windows.Forms.MenuItem menuItem2;
private PropertiesForm propForm;
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.Container components = null;
public MainForm()
{
//
// 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.mainMenu1 = new System.Windows.Forms.MainMenu();
this.menuItem1 = new System.Windows.Forms.MenuItem();
this.menuItem2 = new System.Windows.Forms.MenuItem();
//
// mainMenu1
//
this.mainMenu1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
this.menuItem1});
//
// menuItem1
//
this.menuItem1.Index = 0;
this.menuItem1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
this.menuItem2});
this.menuItem1.Text = "File";
//
// menuItem2
//
this.menuItem2.Index = 0;
this.menuItem2.Text = "Open forms";
this.menuItem2.Click += new System.EventHandler(this.menuItem2_Click);
//
// MainForm
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 266);
this.IsMdiContainer = true;
this.Menu = this.mainMenu1;
this.Name = "MainForm";
this.Text = "MainForm";
this.MdiChildActivate += new
System.EventHandler(this.MainForm_MdiChildActivate);
}
#endregion
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new MainForm());
}
private void menuItem2_Click(object sender, System.EventArgs e)
{
if (propForm==null)
{
propForm=new PropertiesForm();
propForm.Show();
}
ChildForm c1=new ChildForm("abc");
c1.Show();
c1.MdiParent=this;
ChildForm c2=new ChildForm("123");
c2.Show();
c2.MdiParent=this;
this.propForm.OnTextChange+=new
ChangeHandler(((ChildForm)this.ActiveMdiChild).TextHasChanged);
}
private void MainForm_MdiChildActivate(object sender, System.EventArgs e)
{
}
}
public class ChildForm : System.Windows.Forms.Form
{
private System.Windows.Forms.TextBox textBox1;
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.Container components = null;
public ChildForm(string s)
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
//
// TODO: Add any constructor code after InitializeComponent call
//
textBox1.Text=s;
}
/// <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.textBox1 = new System.Windows.Forms.TextBox();
this.SuspendLayout();
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(48, 48);
this.textBox1.Name = "textBox1";
this.textBox1.ReadOnly = true;
this.textBox1.Size = new System.Drawing.Size(192, 20);
this.textBox1.TabIndex = 1;
this.textBox1.Text = "";
//
// ChildForm
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 266);
this.Controls.Add(this.textBox1);
this.Name = "ChildForm";
this.Text = "ChildForm";
this.ResumeLayout(false);
}
#endregion
public void TextHasChanged(object sender, System.EventArgs e)
{
this.textBox1.Text=((TextBox)sender).Text;
}
}
public delegate void ChangeHandler(object sender, EventArgs e);
/// <summary>
/// Summary description for PropertiesForm.
/// </summary>
public class PropertiesForm : System.Windows.Forms.Form
{
private System.Windows.Forms.TextBox textBox1;
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.Container components = null;
public event ChangeHandler OnTextChange;
public PropertiesForm()
{
//
// 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.textBox1 = new System.Windows.Forms.TextBox();
this.SuspendLayout();
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(48, 48);
this.textBox1.Name = "textBox1";
this.textBox1.Size = new System.Drawing.Size(192, 20);
this.textBox1.TabIndex = 0;
this.textBox1.Text = "";
this.textBox1.TextChanged += new
System.EventHandler(this.textBox1_TextChanged);
//
// PropertiesForm
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 266);
this.Controls.Add(this.textBox1);
this.Name = "PropertiesForm";
this.Text = "PropertiesForm";
this.ResumeLayout(false);
}
#endregion
private void textBox1_TextChanged(object sender, System.EventArgs e)
{
if (OnTextChange!=null)
OnTextChange(sender, e);
}
}
}
//*********************************
"TerryFei" said:
Hi Nick,
Nice to see you again! : )
I am not very clear to it. Would you provide me a sample to reproduce it. I
think it'll help us get closer to this issue.
If your meaning is that the same event for multiple objects (all child
windows)to be handled by the same method, such as multiple buttons with the
same handler. And you want to know which genuine object in handler is. You
could use the sender argument to determine which object fired the event:
private void button_Click(object sender, System.EventArgs e) {
Button button = sender as Button;
MessageBox.Show(button.Text + " was clicked");
}
If you have any questions, please don't hesitate to let me know. Thanks and
have a nice day!
Best Regards,
Terry Fei [MSFT]
Microsoft Community Support
Get Secure!
www.microsoft.com/security
(This posting is provided "AS IS", with no warranties, and confers no
rights.)
