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OpenWriteCompletedEventArgs Class

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

Provides data for the OpenWriteCompleted event.

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

'Declaration
Public Class OpenWriteCompletedEventArgs
	Inherits AsyncCompletedEventArgs
'Usage
Dim instance As OpenWriteCompletedEventArgs

public class OpenWriteCompletedEventArgs extends AsyncCompletedEventArgs
public class OpenWriteCompletedEventArgs extends AsyncCompletedEventArgs

Instances of this class are passed to OpenWriteCompletedEventHandler methods.

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)
    client.OpenWriteAsync(uri)
    '  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

    Try

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

        If Not s Is Nothing Then

            s.Close()
        End If

        If Not body Is Nothing Then

            body.Close()
        End If
    End Try
End Sub


System.Object
   System.EventArgs
     System.ComponentModel.AsyncCompletedEventArgs
      System.Net.OpenWriteCompletedEventArgs

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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

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