DataControlField.OnFieldChanged Method
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Raises the FieldChanged
event.
protected:
virtual void OnFieldChanged();
protected virtual void OnFieldChanged ();
abstract member OnFieldChanged : unit -> unit
override this.OnFieldChanged : unit -> unit
Protected 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.
Applies to
意見反應
https://aka.ms/ContentUserFeedback。
即將登場:在 2024 年,我們將逐步淘汰 GitHub 問題作為內容的意見反應機制,並將它取代為新的意見反應系統。 如需詳細資訊,請參閱:提交並檢視相關的意見反應