Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
DownloadProgressChangedEventHandler Delegate
Collapse the table of content
Expand the table of content

DownloadProgressChangedEventHandler Delegate

Represents the method that will handle the WebClient.DownloadProgressChanged event of a WebClient.

Namespace:  System.Net
Assembly:  System (in System.dll)

'Declaration
Public Delegate Sub DownloadProgressChangedEventHandler ( _
	sender As Object, _
	e As DownloadProgressChangedEventArgs _
)

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. Events and Delegates

NoteNote

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

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8
Show:
© 2015 Microsoft