Export (0) Print
Expand All
Expand Minimize

Form.OnClosed Method

Raises the Closed event.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

protected virtual void OnClosed(
	EventArgs e
)

Parameters

e
Type: System.EventArgs

The EventArgs that contains the event data.

Caution noteCaution

The OnClosed method is obsolete in the .NET Framework version 2.0; use the OnFormClosed method instead.

Raising an event invokes the event handler through a delegate. For more information, see Handling and Raising Events.

The OnFormClosed method also allows derived classes to handle the event without attaching a delegate. Overriding this method is the preferred technique for handling the event in a derived class.

Caution noteCaution

The OnClosed and OnClosing methods are not called when the Application.Exit method is called to exit your application. If you have validation code in either of these methods that must be executed, you should call the Form.Close method for each open form individually before calling the Exit method.

Notes to Implementers

When overriding OnClosed in a derived class, be sure to call the base class's OnClosed method so that registered delegates receive the event.

The following code example demonstrates how to override the OnClosed method in a class derived from Form .

public class myForm:
    Form

{
    protected override void OnClosed(EventArgs e)
    {
        MessageBox.Show("The form is now closing.", 
            "Close Warning", MessageBoxButtons.OK, MessageBoxIcon.Warning);
        base.OnClosed(e);
    }

    public myForm() : base()
    {        
    }

}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Show:
© 2014 Microsoft