DownloadDataCompletedEventArgs Class
.NET Framework 3.0
Provides data for the DownloadDataCompleted event.
Namespace: System.Net
Assembly: System (in system.dll)
Assembly: System (in system.dll)
'Declaration Public Class DownloadDataCompletedEventArgs Inherits AsyncCompletedEventArgs 'Usage Dim instance As DownloadDataCompletedEventArgs
public class DownloadDataCompletedEventArgs extends AsyncCompletedEventArgs
public class DownloadDataCompletedEventArgs extends AsyncCompletedEventArgs
Not applicable.
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
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
System.Object
System.EventArgs
System.ComponentModel.AsyncCompletedEventArgs
System.Net.DownloadDataCompletedEventArgs
System.EventArgs
System.ComponentModel.AsyncCompletedEventArgs
System.Net.DownloadDataCompletedEventArgs
Windows 98, Windows Server 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 Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.Community Additions
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