CODEWITHSUNDEEP
c#winforms
fm_strategy
fm_strategy

Reputation: 201

C# Form X Button Clicked

How can I find out if a form is closed by clicking the X button or by (this.Close())?

Upvotes: 8

Views: 20542

Answers (4)

ibram
ibram

Reputation: 4589

the form has the event FormClosing with parameter of type FormClosingEventArgs.

// catch the form closing event
private void Form1_FormClosing( object sender, FormClosingEventArgs e )
{
    // check the reason (UserClosing)
    if ( e.CloseReason == CloseReason.UserClosing )
    {
        // do stuff like asking user
        if ( MessageBox.Show( this,
                 "Are you sure you want to close the form?",
                 "Closing Form",
                 MessageBoxButtons.OKCancel,
                 MessageBoxIcon.Question ) == DialogResult.Cancel )
         {
             // cancel the form closing if necessary
             e.Cancel = true;
         }
    }
}

Upvotes: 24

Felipe Sierra
Felipe Sierra

Reputation: 181

For the OnFormClosing the FormClosingEventArgs.CloseReason is UserClosingeither to 'X' button or form.Close() method. My solution: 

//override the OnFormClosing event
        protected override void OnFormClosing(FormClosingEventArgs e)
        {
            if (e.CloseReason == CloseReason.ApplicationExitCall)// the reason that you need
                base.OnFormClosing(e);
            else e.Cancel = true; // cancel if the close reason is not the expected one
        }
//create a new method that allows to handle the close reasons
        public void closeForm(FormClosingEventArgs e)
        {
            if (e.CloseReason == CloseReason.UserClosing) this.Close();
            else e.Cancel = true;
        }

  //if you want to close the form or deny the X button action invoke closeForm method
    myForm.closeForm(new FormClosingEventArgs(CloseReason.ApplicationExitCall, false));
                              //the reason that you want ↑

In this example the close (X) button does not close the form

Upvotes: 0

khaLie
khaLie

Reputation: 11

If you want to set the returned field to null, like you do when you click Cancel in your Form:

private void Form1_FormClosing( object sender, FormClosingEventArgs e )
{
    if ( e.CloseReason == CloseReason.UserClosing )
    {
        returnfield = null;
        this.close();
    }
}

Upvotes: 1

Xander
Xander

Reputation: 1133

You could remove the 'X' altogether?

One of the properties of the form is "ControlBox" just set this to false

Upvotes: 3

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