WebClient.OnOpenWriteCompleted(OpenWriteCompletedEventArgs) 方法
定义
重要
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引发 OpenWriteCompleted 事件。
protected:
virtual void OnOpenWriteCompleted(System::Net::OpenWriteCompletedEventArgs ^ e);
protected virtual void OnOpenWriteCompleted (System.Net.OpenWriteCompletedEventArgs e);
abstract member OnOpenWriteCompleted : System.Net.OpenWriteCompletedEventArgs -> unit
override this.OnOpenWriteCompleted : System.Net.OpenWriteCompletedEventArgs -> unit
Protected Overridable Sub OnOpenWriteCompleted (e As OpenWriteCompletedEventArgs)
参数
包含事件数据的 OpenWriteCompletedEventArgs 对象。
示例
下面的代码示例演示此方法的实现,该方法可由派生自 WebClient的类进行自定义。
virtual void OnOpenWriteCompleted( OpenWriteCompletedEventArgs ^ e ) override
{
// Here you can perform any custom actions before the event is raised
// and event handlers are called...
WebClient::OnOpenWriteCompleted( e );
// Here you can perform any post event actions...
}
protected override void OnOpenWriteCompleted (OpenWriteCompletedEventArgs e)
{
// Here you can perform any custom actions before the event is raised
// and event handlers are called...
base.OnOpenWriteCompleted (e);
// Here you can perform any post event actions...
}
注解
从此类继承的类可以重写此方法,以在事件发生时 OpenWriteCompleted 执行其他任务。
引发事件时,将通过委托调用事件处理程序。 有关详细信息,请参阅 处理和引发事件。
OnOpenWriteCompleted 方法还允许派生类对事件进行处理而不必附加委托。 这是在派生类中处理事件的首选技术。
继承者说明
在派生类中重写 OnOpenWriteCompleted(OpenWriteCompletedEventArgs) 时,请务必调用基类的 OnOpenWriteCompleted(OpenWriteCompletedEventArgs) 方法,以便注册的委托接收事件。
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