WebClient.OpenReadCompleted 事件

定义

在以下异步操作完成时发生,该操作打开包含某个资源的流。

public:
 event System::Net::OpenReadCompletedEventHandler ^ OpenReadCompleted;
public event System.Net.OpenReadCompletedEventHandler? OpenReadCompleted;
public event System.Net.OpenReadCompletedEventHandler OpenReadCompleted;
member this.OpenReadCompleted : System.Net.OpenReadCompletedEventHandler 
Public Custom Event OpenReadCompleted As OpenReadCompletedEventHandler 
Public Event OpenReadCompleted As OpenReadCompletedEventHandler 

事件类型

OpenReadCompletedEventHandler

示例

下面的代码示例演示如何设置此事件的事件处理程序。

void OpenResourceForReading2( String^ address )
{
   WebClient^ client = gcnew WebClient;
   Uri ^uri = gcnew Uri(address);

   client->OpenReadCompleted += gcnew OpenReadCompletedEventHandler( OpenReadCallback2 );
   client->OpenReadAsync( uri );
}
public static void OpenResourceForReading2(string address)
{
    WebClient client = new WebClient();
    Uri uri = new Uri(address);

    client.OpenReadCompleted += new OpenReadCompletedEventHandler(OpenReadCallback2);
    client.OpenReadAsync(uri);
}
Public Shared Sub OpenResourceForReading2(ByVal address As String)

    Dim client As WebClient = New WebClient()
    AddHandler client.OpenReadCompleted, AddressOf OpenReadCallback2
                Dim uri as Uri = New Uri(address)
    client.OpenReadAsync(uri)
End Sub

注解

每次异步操作打开包含资源的流时都会引发此事件。 这些操作通过调用 OpenReadAsync 方法启动。

OpenReadCompletedEventHandler 事件的委托。 该 OpenReadCompletedEventArgs 类为事件处理程序提供事件数据。

有关如何处理事件的详细信息,请参阅 处理和引发事件

适用于