Assembly: System (in system.dll)
'Declaration Public Delegate Sub DownloadProgressChangedEventHandler ( _ sender As Object, _ e As DownloadProgressChangedEventArgs _ ) 'Usage Dim instance As New DownloadProgressChangedEventHandler(AddressOf HandlerMethod)
/** @delegate */ public delegate void DownloadProgressChangedEventHandler ( Object sender, DownloadProgressChangedEventArgs e )
The source of the event.
A DownloadProgressChangedEventArgs containing event data.
When you create a DownloadProgressChangedEventHandler delegate, you identify the method that will handle the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate. For more information about event handler delegates, see Events and Delegates. Events and Delegates
If the server does not send the size of the downloaded file (such as in the case of a passive FTP connection), ProgressPercentage may always be zero.
The following code example demonstrates setting an event handler for the WebClient.DownloadProgressChanged event.
' Sample call : DownLoadFileInBackground2 ("http:' www.contoso.com/logs/January.txt") Public Shared Sub DownLoadFileInBackground2(ByVal address As String) Dim client As WebClient = New WebClient() ' Specify that the DownloadFileCallback method gets called ' when the download completes. AddHandler client.DownloadFileCompleted, AddressOf DownloadFileCallback2 ' Specify a progress notification handler. AddHandler client.DownloadProgressChanged, AddressOf DownloadProgressCallback Dim uri as Uri = New Uri(address) client.DownloadFileAsync(uri, "serverdata.txt") End Sub
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.