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DownloadDataCompletedEventArgs Class
Visual Studio 2008
Provides data for the DownloadDataCompleted event.
Assembly: System (in System.dll)
Instances of this class are passed to the DownloadDataCompletedEventHandler.
The following code example demonstrates downloading a user-specified resource.
' Sample call : DownLoadDataInBackground ("http:' www.contoso.com/GameScores.html") Public Shared Sub DownloadDataInBackground(ByVal address As String) Dim waiter As System.Threading.AutoResetEvent = New System.Threading.AutoResetEvent(False) Dim client As WebClient = New WebClient() ' Specify that the DownloadDataCallback method gets called ' when the download completes. AddHandler client.DownloadDataCompleted, AddressOf DownloadDataCallback Dim uri as Uri = New Uri(address) client.DownloadDataAsync(uri, waiter) ' Block the main application thread. Real applications ' can perform other tasks while waiting for the download to complete. waiter.WaitOne() End Sub
// Sample call : DownLoadDataInBackground ("http://www.contoso.com/GameScores.html");
void DownloadDataInBackground (String* address)
{
System::Threading::AutoResetEvent* waiter = new System::Threading::AutoResetEvent (false);
WebClient* client = new WebClient ();
// Specify that the DownloadDataCallback method gets called
// when the download completes.
client->DownloadDataCompleted += new DownloadDataCompletedEventHandler (DownloadDataCallback);
client->DownloadDataAsync (address, waiter);
// Block the main application thread. Real applications
// can perform other tasks while waiting for the download to complete.
waiter->WaitOne ();
}
The following method is called when the download completes.
Private Shared Sub DownloadDataCallback(ByVal sender As Object, ByVal e As DownloadDataCompletedEventArgs) Dim waiter As System.Threading.AutoResetEvent = CType(e.UserState, System.Threading.AutoResetEvent) Try ' If the request was not canceled and did not throw ' an exception, display the resource. If e.Cancelled = False AndAlso e.Error Is Nothing Then Dim data() As Byte = CType(e.Result, Byte()) Dim textData As String = System.Text.Encoding.UTF8.GetString(data) Console.WriteLine(textData) End If Finally ' Let the main application thread resume. waiter.Set() End Try End Sub
void DownloadDataCallback (Object* /*sender*/, DownloadDataCompletedEventArgs* e)
{
System::Threading::AutoResetEvent* waiter = dynamic_cast<System::Threading::AutoResetEvent*>(e->UserToken);
try
{
// If the request was not canceled and did not throw
// an exception, display the resource.
if (!e->Cancelled && e->Error == 0)
{
Byte data[] = dynamic_cast<Byte[]>(e->Result);
String* textData = System::Text::Encoding::UTF8->GetString (data);
Console::WriteLine (textData);
}
}
__finally
{
// Let the main application thread resume.
waiter->Set ();
}
}
System.Object
System.EventArgs
System.ComponentModel.AsyncCompletedEventArgs
System.Net.DownloadDataCompletedEventArgs
System.EventArgs
System.ComponentModel.AsyncCompletedEventArgs
System.Net.DownloadDataCompletedEventArgs
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.
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