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OpenWriteCompletedEventHandler Delegate

Note: This delegate is new in the .NET Framework version 2.0.

Represents the method that will handle the OpenWriteCompleted event of a WebClient.

Namespace: System.Net
Assembly: System (in system.dll)

Public Delegate Sub OpenWriteCompletedEventHandler ( _
	sender As Object, _
	e As OpenWriteCompletedEventArgs _
Dim instance As New OpenWriteCompletedEventHandler(AddressOf HandlerMethod)
/** @delegate */
public delegate void OpenWriteCompletedEventHandler (
	Object sender, 
	OpenWriteCompletedEventArgs e
JScript supports the use of delegates, but not the declaration of new ones.



The source of the event.


A OpenWriteCompletedEventArgs containing event data.

When you create a OpenWriteCompletedEventHandler delegate, you identify the method that will handle the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate.

The following code example demonstrates opening a stream to write data to be uploaded.

Public Shared Sub OpenResourceForPosting(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)
    '  Applications can perform other tasks
    '  while waiting for the upload to complete.
End Sub

The following method is called when the stream is available.

Public Shared Sub OpenWriteCallback2(ByVal sender As Object, ByVal e As OpenWriteCompletedEventArgs)

    Dim body As Stream = Nothing
    Dim s As StreamWriter = Nothing


        body = CType(e.Result, Stream)
        s = New StreamWriter(body)
        s.AutoFlush = True
        s.Write("This is content data to be sent to the server.")

        If Not s Is Nothing Then

        End If

        If Not body Is Nothing Then

        End If
    End Try
End Sub

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0