Raising an event invokes the event handler through a delegate.
The OnValueChanged method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.
Notes to Inheritors: When overriding OnValueChanged in a derived class, be sure to call the base class's OnValueChanged method so that registered delegates receive the event.
Imports Infragistics.Win Imports Infragistics.Win.UltraWinScrollBar Private Sub ultraScrollBar1_ValueChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ultraScrollBar1.ValueChanged Dim scrollbar As UltraScrollBar = sender If scrollbar.Orientation = Orientation.Vertical Then Debug.WriteLine("Vertical scrollbar value changed:") Else Debug.WriteLine("Horizontal scrollbar value changed:") End If Debug.WriteLine("New Value: " + scrollbar.Value.ToString()) End Sub
using System.Diagnostics; using Infragistics.Win; using Infragistics.Win.UltraWinScrollBar; private void ultraScrollBar1_ValueChanged(object sender, System.EventArgs e) { UltraScrollBar scrollbar = sender as UltraScrollBar; if ( scrollbar.Orientation == Orientation.Vertical ) Debug.WriteLine( "Vertical scrollbar value changed:"); else Debug.WriteLine( "Horizontal scrollbar value changed:"); Debug.WriteLine( "New Value: " + scrollbar.Value.ToString()); }
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2