ListView.OnRetrieveVirtualItem(RetrieveVirtualItemEventArgs) Method

Definition

引发 RetrieveVirtualItem 事件。Raises the RetrieveVirtualItem event.

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

Parameters

e
RetrieveVirtualItemEventArgs

一个包含事件数据的 RetrieveVirtualItemEventArgsA RetrieveVirtualItemEventArgs that contains the event data.

Remarks

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.

OnRetrieveVirtualItem 方法还允许派生类对事件进行处理而不必附加委托。The OnRetrieveVirtualItem method also allows 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.

Notes to Inheritors

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

Applies to