DownloadProgressChangedEventHandler Delegate
Represents the method that will handle the WebClient.DownloadProgressChanged event of a WebClient.
Assembly: System (in System.dll)
public delegate void DownloadProgressChangedEventHandler( Object sender, DownloadProgressChangedEventArgs e )
Parameters
- sender
- Type: System.Object
The source of the event.
- e
- Type: System.Net.DownloadProgressChangedEventArgs
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. D98FD58B-FA4F-4598-8378-ADDF4355A115
 Note |
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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 static void DownLoadFileInBackground2 (string address)
{
WebClient client = new WebClient ();
Uri uri = new Uri(address);
// Specify that the DownloadFileCallback method gets called
// when the download completes.
client.DownloadFileCompleted += new AsyncCompletedEventHandler (DownloadFileCallback2);
// Specify a progress notification handler.
client.DownloadProgressChanged += new DownloadProgressChangedEventHandler(DownloadProgressCallback);
client.DownloadFileAsync (uri, "serverdata.txt");
}
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
