WinWindow.Closing Event

Occurs when the WinWindow‘s WinWindow.Form is about to be closed.

Namespace: DevExpress.ExpressApp.Win

Assembly: DevExpress.ExpressApp.Win.v20.2.dll

NuGet Package: DevExpress.ExpressApp.Win

Declaration

C#

public event CancelEventHandler Closing

VB.NET

Public Event Closing As CancelEventHandler

Event Data

The Closing event's data class is CancelEventArgs. The following properties provide information specific to this event:

Property	Description
Cancel	Gets or sets a value indicating whether the event should be canceled.

Remarks

Handle this event to prevent the form from closing. For this purpose, set the Cancel argument passed into the event handler to true.

Related GitHub Examples

The following code snippet (auto-collected from DevExpress Examples) contains a reference to the Closing event.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

C#

XAF_how-to-prompt-when-the-user-is-about-to-exit-a-winforms-application-e527/CS/WinSolution.Module.Win/PromptClosingLastMainWindowController.cs#L40

private void OnWindowClosed(object sender, EventArgs e) {
    ((WinWindow)sender).Closing -= OnWindowClosing;
    ((WinWindow)sender).Closed -= OnWindowClosed;

VB.NET

XAF_how-to-prompt-when-the-user-is-about-to-exit-a-winforms-application-e527/VB/WinSolution.Module.Win/PromptClosingLastMainWindowController.vb#L40

Private Sub OnWindowClosed(ByVal sender As Object, ByVal e As EventArgs)
    RemoveHandler (CType(sender, WinWindow)).Closing, AddressOf OnWindowClosing
    RemoveHandler (CType(sender, WinWindow)).Closed, AddressOf OnWindowClosed