تحرير

ListBox.RaisePostDataChangedEvent Method

  • Reference

Definition

Namespace:
System.Web.UI.WebControls
Assembly:
System.Web.dll

Invokes the OnSelectedIndexChanged(EventArgs) method whenever posted data for the ListBox control has changed.

protected:
 virtual void RaisePostDataChangedEvent();
protected virtual void RaisePostDataChangedEvent ();
abstract member RaisePostDataChangedEvent : unit -> unit
override this.RaisePostDataChangedEvent : unit -> unit
Protected Overridable Sub RaisePostDataChangedEvent ()

Remarks

The RaisePostDataChangedEvent method is used primarily by control developers, when deriving a custom control from the ListBox control.

The ASP.NET page framework calls the RaisePostDataChangedEvent method on a ListBox control when the LoadPostData method indicates that the state of the list items have changed in the ListBox control. The RaisePostDataChangedEvent method calls the OnSelectedIndexChanged method to raise the SelectedIndexChanged event. Control developers can override the OnSelectedIndexChanged method to perform custom processing when the user selects list items in the control.

The RaisePostDataChangedEvent method can optionally perform validation before raising the SelectedIndexChanged event for the control. To validate a group of controls on the page when a list item within the ListBox is selected, set the AutoPostBack and CausesValidation properties to true, and then specify the group of controls to validate in the ValidationGroup property.

Applies to

See also