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BeforeExpandEventHandler Delegate

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

Namespace: DevExpress.XtraTreeList

Assembly: DevExpress.XtraTreeList.v22.2.dll

NuGet Package: DevExpress.Win.TreeList


public delegate void BeforeExpandEventHandler(
    object sender,
    BeforeExpandEventArgs e


Name Type Description
sender Object

The event source.

e BeforeExpandEventArgs

A BeforeExpandEventArgs class instance containing event data.


When you create a BeforeExpandEventHandler 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