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BeforeCollapseEventHandler Delegate

Represents a method that will handle the TreeList.BeforeCollapse event of the TreeList class.

Namespace: DevExpress.XtraTreeList

Assembly: DevExpress.XtraTreeList.v22.2.dll

NuGet Package: DevExpress.Win.TreeList


public delegate void BeforeCollapseEventHandler(
    object sender,
    BeforeCollapseEventArgs e


Name Type Description
sender Object

The event source.

e BeforeCollapseEventArgs

A BeforeCollapseEventArgs class instance containing event data.


When you create a BeforeCollapseEventHandler delegate, you identify a method that will handle the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate. For more information on event handler delegates, see Events and Delegates in MSDN.

See Also