Control.OnValidating(CancelEventArgs) Method

Definition

引发 Validating 事件。Raises the Validating event.

protected:
 virtual void OnValidating(System::ComponentModel::CancelEventArgs ^ e);
protected virtual void OnValidating (System.ComponentModel.CancelEventArgs e);
abstract member OnValidating : System.ComponentModel.CancelEventArgs -> unit
override this.OnValidating : System.ComponentModel.CancelEventArgs -> unit
Protected Overridable Sub OnValidating (e As CancelEventArgs)

Parameters

e
CancelEventArgs

一个包含事件数据的 CancelEventArgsA CancelEventArgs 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.

利用 OnValidating 方法,派生类还可以处理事件,而无需附加委托。The OnValidating 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.

Notes to Inheritors

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

Applies to

See also