Form.OnClosed(EventArgs) Method
Important
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Raises the Closed event.
protected:
virtual void OnClosed(EventArgs ^ e);
protected virtual void OnClosed(EventArgs e);
abstract member OnClosed : EventArgs -> unit
override this.OnClosed : EventArgs -> unit
Protected Overridable Sub OnClosed (e As EventArgs)
The following example demonstrates how to override the OnClosed method in a class derived from Form .
public ref class myForm: public Form
{
protected:
virtual void OnClosed( EventArgs^ e ) override
{
MessageBox::Show( "The form is now closing.", "Close Warning", MessageBoxButtons::OK, MessageBoxIcon::Warning );
Form::OnClosed( e );
}
public:
myForm()
: 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()
{
}
}
Public Class myForm
Inherits Form
Protected Overrides Sub OnClosed(ByVal e As EventArgs)
MessageBox.Show("The form is now closing.", "Close Warning", _
MessageBoxButtons.OK, MessageBoxIcon.Warning)
MyBase.OnClosed(e)
End Sub
Public Sub New()
MyBase.New()
End Sub
End Class
Caution
The OnClosed method is obsolete starting with the .NET Framework 2.0; use the OnFormClosed method instead.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
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.
When overriding OnClosed(EventArgs) in a derived class, be sure to call the base class's OnClosed(EventArgs) method so that registered delegates receive the event.
Product | Versions |
---|---|
.NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
Windows Desktop | 3.0, 3.1, 5, 6, 7, 8, 9 |
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