Solved

C# Change Form to MDI Child and back again

Posted on 2009-06-30
1
893 Views
Last Modified: 2012-05-07
I'm writing an MDI application with a lot of MDI child forms. I'm trying to add  the ability to change the forms from an MDI child to a floating form and back again. So far I've managed to change them to floating forms, but when I try to change them back to MDI children, I get the following exception when calling Form.Show():

An unhandled exception of type 'System.ComponentModel.Win32Exception' occurred in System.Windows.Forms.dll

Additional information: Error creating window handle.

Note: The property 'ContainerForm' references an MDIContainer form.
I've already tried the pinvoke SetParent method, but this prevents my toolstrips from working. and you lose the vista windows transparency effects.

Thanks
if (bConfined && this.MdiParent == null)

            {

                this.Hide();

                this.ContainerForm.RemoveOwnedForm(this);

                this.MdiParent = this.ContainerForm;

                this.Show();  //   <-- Exception occurs here

            }

            else if (!bConfined && this.MdiParent != null)

            {

                this.Hide();

                this.MdiParent = null;

                this.Show(this.ContainerForm);

                // SetParent(this.Handle, this.ContainerForm.Handle);

            }

Open in new window

0
Comment
Question by:ttnetworks
1 Comment
 

Accepted Solution

by:
ttnetworks earned 0 total points
ID: 24745220
Solved!

            if (bConfined && this.MdiParent == null)
            {
                this.Hide();
                this.Owner = null;
                this.Show();                
                this.MdiParent = this.ContainerForm;                
            }
            else if (!bConfined && this.MdiParent != null)
            {
                this.Hide();
                this.MdiParent = null;                
                this.Owner = this.ContainerForm;
                this.Show();
            }
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

Article by: Najam
Having new technologies does not mean they will completely replace old components.  Recently I had to create WCF that will be called by VB6 component.  Here I will describe what steps one should follow while doing so, please feel free to post any qu…
Exception Handling is in the core of any application that is able to dignify its name. In this article, I'll guide you through the process of writing a DRY (Don't Repeat Yourself) Exception Handling mechanism, using Aspect Oriented Programming.
This Micro Tutorial hows how you can integrate  Mac OSX to a Windows Active Directory Domain. Apple has made it easy to allow users to bind their macs to a windows domain with relative ease. The following video show how to bind OSX Mavericks to …
Internet Business Fax to Email Made Easy - With  eFax Corporate (http://www.enterprise.efax.com), you'll receive a dedicated online fax number, which is used the same way as a typical analog fax number. You'll receive secure faxes in your email, f…

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

16 Experts available now in Live!

Get 1:1 Help Now