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 NIB: Events and Delegates. NIB: Events and Delegates
 Note |
|---|
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"); void DownLoadFileInBackground2( String^ address ) { WebClient^ client = gcnew WebClient; Uri ^uri = gcnew Uri(address); // Specify that the DownloadFileCallback method gets called // when the download completes. client->DownloadFileCompleted += gcnew AsyncCompletedEventHandler( DownloadFileCallback2 ); // Specify a progress notification handler. client->DownloadProgressChanged += gcnew DownloadProgressChangedEventHandler( DownloadProgressCallback ); client->DownloadFileAsync( uri, "serverdata.txt" ); }
Available since 2.0
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0