Solved

How do you trap the close button on an MDI child form?

Posted on 2008-06-20
2
813 Views
Last Modified: 2013-12-03
I have a custom use application I am developing, but I'm having a problem with some child forms.  I have one child form (an output console) that needs to be opened to see the debugging output.  I have no problem getting the form to open, minimize, etc.  but, I cannot keep it from releasing it's resources when you click the close (X) button.  I DO NOT want to disable the button.  What I have done is setup an event handler for when the form closes.  Instead of closing, it hides the window.   However, as soon as the window is hidden once, if you try to show (form.show() or form.visible = true;) it errors out and the application locks up.  The error message from VS08 is: System.ObjectDisposedException was unhandled.  The object that was unhandled is the form I want to show.  I'm guessing what is happening is it is getting disposed before the code comes in from my event handler (e.cancel():)  So, I'm guessing my only option is to somehow trap the close button and never initiate a close to being with.  If I could force it to only hide, that should be perfect.  I've searched for days on end and cannot find any solutions other than disabling the close button (again, CAN NOT do this) or handling the closing event like I'm already doing.

Below is the code for my event hanlder:

private void consoleForm_FormClosing(object sender, FormClosingEventArgs e)

        {

                e.Cancel = true;

                this.Hide();

        }

Open in new window

0
Comment
Question by:Journer
2 Comments
 
LVL 6

Accepted Solution

by:
Bruce_1975 earned 125 total points
ID: 21831954
You have to override the event handler ;o)

Regards,
Bruce
protected override void OnClosing(CancelEventArgs e)

{

    e.Cancel = true;

    this.Hide();

}

Open in new window

0
 
LVL 2

Author Comment

by:Journer
ID: 21832105
you rock!
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article is for Object-Oriented Programming (OOP) beginners. An Interface contains declarations of events, indexers, methods and/or properties. Any class which implements the Interface should provide the concrete implementation for each Inter…
Wouldn’t it be nice if you could test whether an element is contained in an array by using a Contains method just like the one available on List objects? Wouldn’t it be good if you could write code like this? (CODE) In .NET 3.5, this is possible…
This Micro Tutorial will teach you how to censor certain areas of your screen. The example in this video will show a little boy's face being blurred. This will be demonstrated using Adobe Premiere Pro CS6.
This is Part 3 in a 3-part series on Experts Exchange to discuss error handling in VBA code written for Excel. Part 1 of this series discussed basic error handling code using VBA. http://www.experts-exchange.com/videos/1478/Excel-Error-Handlin…

910 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

23 Experts available now in Live!

Get 1:1 Help Now