WebClient.OnDownloadStringCompleted(DownloadStringCompletedEventArgs) 方法

定义

命名空间:

System.Net

程序集:

System.Net.WebClient.dll

Source:

WebClient.cs

引发 DownloadStringCompleted 事件。

protected:
 virtual void OnDownloadStringCompleted(System::Net::DownloadStringCompletedEventArgs ^ e);

protected virtual void OnDownloadStringCompleted (System.Net.DownloadStringCompletedEventArgs e);

abstract member OnDownloadStringCompleted : System.Net.DownloadStringCompletedEventArgs -> unit
override this.OnDownloadStringCompleted : System.Net.DownloadStringCompletedEventArgs -> unit

Protected Overridable Sub OnDownloadStringCompleted (e As DownloadStringCompletedEventArgs)

参数

e

DownloadStringCompletedEventArgs

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

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

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

    base.OnDownloadStringCompleted (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 DownloadStringCompleted 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。

OnDownloadStringCompleted 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 OnDownloadStringCompleted(DownloadStringCompletedEventArgs) 时，请务必调用基类的 OnDownloadStringCompleted(DownloadStringCompletedEventArgs) 方法，以便注册的委托接收 事件。