Exiting application stopped by validation?

[TMattC]

So, Im writing a Forms application, an I am using the Validating event on some TextBoxes (setting e.Cancel = true if bad input). It works just fine until I click the red x in order to exit the application. If a textbox with faulty text has the focus then, the Validating event runs and makes the application not exit. What can I do about it?

[Dave Kreskowiak]

Set a flag in the Closing event and check the flag for being set in the Validating events.

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Dave Kreskowiak

[TMattC]

Doesnt work. The Validating event on the TextBox sets off before the FormClosing event.

[CHill60]

I wouldn't normally do this, but I published a tip about this ... Allow Form to close when invalid data is present[^] which might help

[TMattC]

Thanks, that article is exactly what I experience. Though the trick with the FormClosing event didnt really do it for me. The application does exit, but not until my MessageBox is sprung from the Validating event.

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
e.Cancel = false;
}

What did work the way I intended (the application exiting without any validating), was the WndProc override.

private const int WM_CLOSE = 0x0010;
...
protected override void WndProc(ref Message m)
{
if (m.Msg == WM_CLOSE) // Attempting to close Form
AutoValidate = AutoValidate.Disable; //this stops (all) validations

    base.WndProc(ref m);    //call the base method to handle other messages

}

Great work!

[CHill60]

I'm glad it worked!