DataControlField.OnFieldChanged Method
Definition
Important
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Raises the FieldChanged event.
protected:
virtual void OnFieldChanged();protected virtual void OnFieldChanged ();abstract member OnFieldChanged : unit -> unit
override this.OnFieldChanged : unit -> unitProtected Overridable Sub OnFieldChanged ()Remarks
The OnFieldChanged method raises an event signaling that the DataControlField object's state has changed. Changes to the following properties cause this event to be raised: FooterText, HeaderImageUrl, HeaderText, ShowHeader, SortExpression, and Visible. Derived type properties also raise this event when state changes occur. Web server controls such as DetailsView and GridView typically call the DataBind method in response to a field change event.
Raising an event invokes the event handler through a delegate. For more information, see Handling and Raising Events.
The OnFieldChanged 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 OnFieldChanged() in a derived class, be sure to call the base class's OnFieldChanged() method so that registered delegates receive the event.
