C# - FormClosing event handling

[Daniel Walker]

Hey there,

I'm having a problem with this code snippet: (C#)

private void MainForm_FormClosing(object sender, FormClosingEventArgs e)
        {
            e.Cancel = true;
            OtherForm dialog = new OtherForm();
            DialogResult result = dialog.ShowDialog();
            if (result == DialogResult.OK)
            {
                Application.Exit();
            }
        }

MainForm throws the event, doesn't close, and shows the dialog.
If I add a watch on result, I can see it gets "OK" as its value, however, the application does not close. Any thoughts?

[misza]

Hi,

The proper way to control whether to close a form in FormClosing event is to set the "e.Cancel" property:
- to false when you want to allow it to close
- to true to prevent closing

so as I understand, you want to do something like this:

private void MainForm_FormClosing(object sender, FormClosingEventArgs e)
{
OtherForm other = new OtherForm();
DialogResult resutl = other.ShowDialog();
if(result != DialogResult.OK)
{
   e.Cancel = true;
}
 
}
 

In other words you don't have to allow the form to close in FormClosing, just prevent it if needed.

Hope this solves your problem,
Michal

[Daniel Walker]

Thanks a lot for the reply. I actually found this out right after I posted it.

[Plater]

All Application.Exit() does it send a windows message to close the form....which it already does to get to that event.