Solved

Close all sub windows

Posted on 2010-09-24
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Last Modified: 2012-05-10
I have MainForm and SubForm in project and I create several instances of SubForm from MainForm by using:

SubForm f1 = new SubForm();
f1.Show();

SubForm f2 = new SubForm();
f2.Show();
...
...

Now - what code can I use from MainForm to close all SubForm instances at once?
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Question by:I_want_to_know
6 Comments
 
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Expert Comment

by:antonybrahin
ID: 33752052
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LVL 52

Accepted Solution

by:
Carl Tawn earned 80 total points
ID: 33752055
If this an MDI window, or just a standard window? If it's a standard window tehn you would be better off holding the references in a list which you can then iterate over and close the sub windows:
List<SubForm> childWindows = new List<SubForm>();

// open a couple of new windows
childWindows.Add(new SubForm())
childWindows[childWindows.Count-1].Show();

childWindows.Add(new SubForm())
childWindows[childWindows.Count-1].Show();

// close all child windows
foreach(SubForm child in childWindows)
{
    child.Close();
}

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Assisted Solution

by:w00te
w00te earned 45 total points
ID: 33753446
I don't have VS on me right now, but I believe this is a quick solution to close all forms except the one you're currently on.  As long as you dont have multiple forms of other types you wish to keep open, this should be a simple and quick solution.

-w00te
foreach (Form form in Application.OpenForms) 
{ 
    if (form != this)
        form.Close();         
} 

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Author Comment

by:I_want_to_know
ID: 33754191
foreach (Form form in Application.OpenForms)
{
    if (form != this)
        form.Close();        
}


This seemed like very quick way but throws exception. I don´t have the exception message in english so I try to translate it: "The collection was edited. The enumeration operation will probably not launched. " Sorry for this clumsy translation. But you will probably know, what exact english message it relates to.
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Author Comment

by:I_want_to_know
ID: 33754250
After little research I found the reason for the exception and solution:

List<Form> list = new List<Form>();

            foreach (Form f in Application.OpenForms)
                list.Add(f);


            foreach (Form f in list)
                if(f !=this)
                f.Close();

Found here: http://www.csharp411.com/close-all-forms-in-a-thread-safe-manner/
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Author Closing Comment

by:I_want_to_know
ID: 33754314
Both had some useful information
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