ListBox.OnMeasureItem(MeasureItemEventArgs) 方法

定义

引发 MeasureItem 事件。Raises the MeasureItem event.

protected:
 virtual void OnMeasureItem(System::Windows::Forms::MeasureItemEventArgs ^ e);
protected virtual void OnMeasureItem (System.Windows.Forms.MeasureItemEventArgs e);
abstract member OnMeasureItem : System.Windows.Forms.MeasureItemEventArgs -> unit
override this.OnMeasureItem : System.Windows.Forms.MeasureItemEventArgs -> unit
Protected Overridable Sub OnMeasureItem (e As MeasureItemEventArgs)

参数

e
MeasureItemEventArgs

包含事件数据的 MeasureItemEventArgsA MeasureItemEventArgs that contains the event data.

注解

引发事件时,将通过委托调用事件处理程序。Raising an event invokes the event handler through a delegate. 有关详细信息,请参阅处理和引发事件For more information, see Handling and Raising Events.

利用 OnMeasureItem 方法,派生类还可以处理事件,而无需附加委托。The OnMeasureItem method also enables derived classes to handle the event without attaching a delegate. 这是在派生类中处理事件的首选技术。This is the preferred technique for handling the event in a derived class.

继承者说明

在派生类中重写 OnMeasureItem(MeasureItemEventArgs) 时,一定要调用基类的 OnMeasureItem(MeasureItemEventArgs) 方法,以便已注册的委托对事件进行接收。When overriding OnMeasureItem(MeasureItemEventArgs) in a derived class, be sure to call the base class's OnMeasureItem(MeasureItemEventArgs) method so that registered delegates receive the event.

适用于

另请参阅