Form.OnClosing(CancelEventArgs) Method
Definition
Important
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Caution
Form.OnClosing, Form.OnClosed and the corresponding events are obsolete. Use Form.OnFormClosing, Form.OnFormClosed, Form.FormClosing and Form.FormClosed instead.
Raises the Closing event.
protected:
virtual void OnClosing(System::ComponentModel::CancelEventArgs ^ e);protected virtual void OnClosing(System.ComponentModel.CancelEventArgs e);[System.Obsolete("Form.OnClosing, Form.OnClosed and the corresponding events are obsolete. Use Form.OnFormClosing, Form.OnFormClosed, Form.FormClosing and Form.FormClosed instead.", false, DiagnosticId="WFDEV004", UrlFormat="https://aka.ms/winforms-warnings/{0}")]
protected virtual void OnClosing(System.ComponentModel.CancelEventArgs e);abstract member OnClosing : System.ComponentModel.CancelEventArgs -> unit
override this.OnClosing : System.ComponentModel.CancelEventArgs -> unit[<System.Obsolete("Form.OnClosing, Form.OnClosed and the corresponding events are obsolete. Use Form.OnFormClosing, Form.OnFormClosed, Form.FormClosing and Form.FormClosed instead.", false, DiagnosticId="WFDEV004", UrlFormat="https://aka.ms/winforms-warnings/{0}")>]
abstract member OnClosing : System.ComponentModel.CancelEventArgs -> unit
override this.OnClosing : System.ComponentModel.CancelEventArgs -> unitProtected Overridable Sub OnClosing (e As CancelEventArgs)Parameters
A CancelEventArgs that contains the event data.
- Attributes
Remarks
Caution
The OnClosing method is obsolete; use the OnFormClosing method instead.
Raising an event invokes the event handler through a delegate. For more information, see Handling and Raising Events.
The OnClosing 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.
Notes to Inheritors
When overriding OnClosing(CancelEventArgs) in a derived class, be sure to call the base class's OnClosing(CancelEventArgs) method so that registered delegates receive the event.
