cancel form close with FormClosing

[Tino]

I think I read how to do this but searching 'FormClosing' in this forum didn't find anything much.

I simply need to cancel the closing of a form (after user dialog confirmation). Is this the correct approach?

private void OnFormClosing(object sender, FormClosingEventArgs e)
{
    var dlg = new DlgConfirmUnsavedForm();
    var result = dlg.ShowDialog();
    if (result == DialogResult.Cancel)
    {
        e.Cancel = true;
        OnClosing(e);
        return; //??
    }
    else if (result == DialogResult.Yes)
    {
        SaveForm();
    }

    ...
}

 

By the way, post editing is terrible!

[Tino]

I needed to add that my forms are MDI child forms.

[Dimitar]

Hello Tino,

This is the correct approach, consider always calling the base logic:

protected override void OnClosing(CancelEventArgs e)
{
    if (RadMessageBox.Show("Confirm Close", "Close" , MessageBoxButtons.OKCancel) != DialogResult.OK)
    {
        e.Cancel = true;
    }
    base.OnClosing(e);

}

Let me know if I can assist you further.

Regards,
Dimitar
Progress Telerik

[Tino]

Thanks for the response, I've added a call to OnClosing() before the function returns.

I guess I forgot to mention the important thing, that it isn't working for me... the form still closes even with e.Cancel set to true.

I also tested using just your code, nothing else.

 

[Dimitar]

Hi Tino,

This works on my side. I have attached my test project. 

Let me know if I can assist you further.

Regards,
Dimitar
Progress Telerik