OpenReadCompletedEventHandler Delegate
Represents the method that will handle the OpenReadCompleted event of a WebClient.
Assembly: System (in System.dll)
'Declaration Public Delegate Sub OpenReadCompletedEventHandler ( _ sender As Object, _ e As OpenReadCompletedEventArgs _ ) 'Usage Dim instance As New OpenReadCompletedEventHandler(AddressOf HandlerMethod)
Parameters
- sender
- Type: System.Object
The source of the event.
- e
- Type: System.Net.OpenReadCompletedEventArgs
A OpenReadCompletedEventArgs containing event data.
The following code example demonstrates downloading a resource for reading.
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
void OpenResourceForReading2 (String* address)
{
WebClient* client = new WebClient ();
client->OpenReadCompleted += new OpenReadCompletedEventHandler (OpenReadCallback2);
client->OpenReadAsync (address);
}
The following method is called when the download completes.
Private Shared Sub OpenReadCallback2(ByVal sender As Object, ByVal e As OpenReadCompletedEventArgs) Dim reply As Stream = Nothing Dim s As StreamReader = Nothing Try reply = CType(e.Result, Stream) s = New StreamReader(reply) Console.WriteLine(s.ReadToEnd()) Finally If Not s Is Nothing Then s.Close() End If If Not reply Is Nothing Then reply.Close() End If End Try End Sub
void OpenReadCallback2 (Object* /*sender*/, OpenReadCompletedEventArgs* e)
{
Stream* reply = 0;
StreamReader* s = 0;
try
{
reply = dynamic_cast<Stream*>(e->Result);
s = new StreamReader (reply);
Console::WriteLine (s->ReadToEnd ());
}
__finally
{
if (s != 0)
{
s->Close ();
}
if (reply != 0)
{
reply->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.