Parameter.OnParameterChanged Method ()
Assembly: System.Web (in System.Web.dll)
If the Parameter object is not contained by a ParameterCollection collection, calling the method has no effect. If the Parameter object is contained by a ParameterCollection collection, raises the ParameterCollection.ParametersChanged event of the collection.
If the ParameterCollection collection is contained by a data source control, the ParameterCollection.ParametersChanged event raises the data source control's DataSourceChanged event, causing any data-bound controls to rebind.
Raising an event invokes the event handler through a delegate. For more information, see NIB: Raising an Event.
Themethod 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 overridingin a derived class, be sure to call the base class's method so that registered delegates receive the event.
The following code example demonstrates how to call the ParametersChanged event when the state of a parameter changes. This code example is part of a larger example provided for the Parameter class overview.method to raise the
' The Value property is a type safe convenience property ' used when the StaticParameter represents string data. ' It gets the string value of the DataValue property, and ' sets the DataValue property directly. Public Property Value() As String Get Dim o As Object = DataValue If o Is Nothing OrElse Not TypeOf o Is String Then Return String.Empty End If Return CStr(o) End Get Set DataValue = value OnParameterChanged() End Set End Property
Available since 2.0