WebClient.OpenWriteCompleted 事件

定义

在打开流以将数据写入资源的异步操作完成时发生。Occurs when an asynchronous operation to open a stream to write data to a resource completes.

public:
 event System::Net::OpenWriteCompletedEventHandler ^ OpenWriteCompleted;
public event System.Net.OpenWriteCompletedEventHandler OpenWriteCompleted;
member this.OpenWriteCompleted : System.Net.OpenWriteCompletedEventHandler 
Public Event OpenWriteCompleted As OpenWriteCompletedEventHandler 

示例

下面的代码示例演示如何为此事件设置事件处理程序。The following code example demonstrates setting an event handler for this event.

void OpenResourceForWriting2( String^ address )
{
   WebClient^ client = gcnew WebClient;
   Uri ^uri = gcnew Uri(address);
   
   // Specify that the OpenWriteCallback method gets called
   // when the writeable stream is available.
   client->OpenWriteCompleted += gcnew OpenWriteCompletedEventHandler( OpenWriteCallback2 );
   client->OpenWriteAsync( uri, "POST" );
   
   // Applications can perform other tasks
   // while waiting for the upload to complete.
}


public static void OpenResourceForWriting2 (string address)
{
    WebClient client = new WebClient ();
    Uri uri = new Uri(address);

    // Specify that the OpenWriteCallback method gets called
    // when the writeable stream is available.
    client.OpenWriteCompleted += new OpenWriteCompletedEventHandler (OpenWriteCallback2);
    client.OpenWriteAsync (uri, "POST");
    // Applications can perform other tasks
    // while waiting for the upload to complete.
}

Public Shared Sub OpenResourceForWriting2(ByVal address As String)

    Dim client As WebClient = New WebClient()

    '  Specify that the OpenWriteCallback method gets called
    '  when the writeable stream is available.
    AddHandler client.OpenWriteCompleted, AddressOf OpenWriteCallback2
                Dim uri as Uri = New Uri(address)
    client.OpenWriteAsync(uri, "POST")
    '  Applications can perform other tasks
    '  while waiting for the upload to complete.
End Sub

注解

每次打开用于将数据发送到资源的流的异步操作完成时,都会引发此事件。This event is raised each time an asynchronous operation to open a stream that is used to send data to a resource completes. 这些操作通过调用 OpenWriteAsync 方法来启动。These operations are started by calling the OpenWriteAsync methods.

OpenWriteCompletedEventHandler 是此事件的委托。The OpenWriteCompletedEventHandler is the delegate for this event. OpenWriteCompletedEventArgs 类向事件处理程序提供事件数据。The OpenWriteCompletedEventArgs class provides the event handler with event data.

有关如何处理事件的详细信息,请参阅处理和引发事件For more information about how to handle events, see Handling and Raising Events.

适用于