Book.PageIndexChanging Event

Enables cancelling turning the current page.

Namespace: DevExpress.Xpf.Controls

Assembly: DevExpress.Xpf.Controls.v20.2.dll

NuGet Packages: DevExpress.WindowsDesktop.Wpf.Controls, DevExpress.Wpf.Navigation

Declaration

C#

public event PageIndexChangingEventHandler PageIndexChanging

VB.NET

Public Event PageIndexChanging As PageIndexChangingEventHandler

Event Data

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

Property	Description
Cancel	Gets or sets a value indicating whether the event should be canceled. Inherited from CancelEventArgs.
NewPageIndex	Gets or sets the index of the current page.
OldPageIndex	Gets the index of the previous page.

Remarks

The PageIndexChanging event is raised before a new page is about to be opened. This occurs when an end-user turns the page, or the page is opened in code using the Book.PageIndex property.

The PageIndexChanging event can be handled to do the following:

• Cancel the operation by setting the event parameter’s Cancel property to true.
• Implement custom navigation. Use the PageIndexChangingEventArgs.NewPageIndex property to open the required page. The index of the previously opened page is returned by the PageIndexChangingEventArgs.OldPageIndex property.

After a new page has been opened, the Book.PageIndexChanged event is fired.