Solved

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

Posted on 2008-06-20
2
812 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
Comment Utility
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
Comment Utility
you rock!
0

Featured Post

What Is Threat Intelligence?

Threat intelligence is often discussed, but rarely understood. Starting with a precise definition, along with clear business goals, is essential.

Join & Write a Comment

Today I had a very interesting conundrum that had to get solved quickly. Needless to say, it wasn't resolved quickly because when we needed it we were very rushed, but as soon as the conference call was over and I took a step back I saw the correct …
Whether you've completed a degree in computer sciences or you're a self-taught programmer, writing your first lines of code in the real world is always a challenge. Here are some of the most common pitfalls for new programmers.
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…
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.

762 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

6 Experts available now in Live!

Get 1:1 Help Now