DownloadProgressChangedEventHandler Delegate
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DownloadProgressChangedEventHandler Delegate

 

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

Namespace:   System.Net
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

System_CAPS_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 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");
}

.NET Framework
Available since 2.0
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
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