OpenWriteCompletedEventHandler Delegate
Represents the method that will handle the OpenWriteCompleted event of a WebClient.
Assembly: System (in System.dll)
'Declaration Public Delegate Sub OpenWriteCompletedEventHandler ( _ sender As Object, _ e As OpenWriteCompletedEventArgs _ ) 'Usage Dim instance As New OpenWriteCompletedEventHandler(AddressOf HandlerMethod)
Parameters
- sender
- Type: System.Object
The source of the event.
- e
- Type: System.Net.OpenWriteCompletedEventArgs
A OpenWriteCompletedEventArgs containing event data.
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
void OpenResourceForPosting (String* address)
{
WebClient* client = new WebClient ();
// Specify that the OpenWriteCallback method gets called
// when the writeable stream is available.
client->OpenWriteCompleted += new OpenWriteCompletedEventHandler (OpenWriteCallback2);
client->OpenWriteAsync (address);
// Applications can perform other tasks
// while waiting for the upload to complete.
}
The following method is called when the stream is available.
Private 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
void OpenWriteCallback2 (Object* /*sender*/, OpenWriteCompletedEventArgs* e)
{
Stream* body = 0;
StreamWriter* s = 0;
try
{
body = dynamic_cast<Stream*>(e->Result);
s = new StreamWriter (body);
s->AutoFlush = true;
s->Write (S"This is content data to be sent to the server.");
}
__finally
{
if (s != 0)
{
s->Close ();
}
if (body != 0)
{
body->Close ();
}
}
}
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.