WebClient.OnDownloadDataCompleted(DownloadDataCompletedEventArgs) 方法

定义

命名空间:

System.Net

程序集:

System.Net.WebClient.dll

Source:

WebClient.cs

引发 DownloadDataCompleted 事件。

protected:
 virtual void OnDownloadDataCompleted(System::Net::DownloadDataCompletedEventArgs ^ e);

protected virtual void OnDownloadDataCompleted (System.Net.DownloadDataCompletedEventArgs e);

abstract member OnDownloadDataCompleted : System.Net.DownloadDataCompletedEventArgs -> unit
override this.OnDownloadDataCompleted : System.Net.DownloadDataCompletedEventArgs -> unit

Protected Overridable Sub OnDownloadDataCompleted (e As DownloadDataCompletedEventArgs)

参数

e

DownloadDataCompletedEventArgs

包含事件数据的 DownloadDataCompletedEventArgs 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 OnDownloadDataCompleted( DownloadDataCompletedEventArgs ^ e ) override
{
   // Here you can perform any custom actions before the event is raised
   // and event handlers are called...
   WebClient::OnDownloadDataCompleted( e );

   // Here you can perform any post event actions...
}

protected override void OnDownloadDataCompleted (DownloadDataCompletedEventArgs e)
{
    // Here you can perform any custom actions before the event is raised
    // and event handlers are called...

    base.OnDownloadDataCompleted(e);

    // Here you can perform any post event actions...
}

注解

谨慎

WebRequest、HttpWebRequest、ServicePoint和 WebClient 已过时，不应将其用于新开发。 请改用 HttpClient。

从此类继承的类可以重写此方法，以在发生 DownloadDataCompleted 事件时执行其他任务。

引发事件会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。

OnDownloadDataCompleted 方法还允许派生类在不附加委托的情况下处理事件。 这是处理派生类中的事件的首选技术。

继承者说明

在派生类中重写 OnDownloadDataCompleted(DownloadDataCompletedEventArgs) 时，请务必调用基类的 OnDownloadDataCompleted(DownloadDataCompletedEventArgs) 方法，以便注册的委托接收事件。