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WebClient.UploadProgressChanged Event

Note: This event is new in the .NET Framework version 2.0.

Occurs when an asynchronous upload operation successfully transfers some or all of the data.

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

public event UploadProgressChangedEventHandler UploadProgressChanged
/** @event */
public void add_UploadProgressChanged (UploadProgressChangedEventHandler value)

/** @event */
public void remove_UploadProgressChanged (UploadProgressChangedEventHandler value)

JScript supports the use of events, but not the declaration of new ones.

This event is raised each time an asynchronous upload makes progress. This event is raised when uploads are started using any of the following methods.

Method

Description

UploadDataAsync

Sends a Byte array to the resource, without blocking the calling thread.

UploadFileAsync

Sends a local file to the resource, without blocking the calling thread.

UploadValuesAsync

Sends a NameValueCollection to the resource and returns a Byte array containing any response, without blocking the calling thread.

The UploadProgressChangedEventHandler is the delegate for this event. The UploadProgressChangedEventArgs class provides the event handler with event data.

For more information about handling events, see Consuming Events.

The following code example demonstrates setting an event handler for this event.

// Sample call: UploadFileInBackground2("http://www.contoso.com/fileUpload.aspx", "data.txt")
public static void UploadFileInBackground2 (string address, string fileName)
{
    WebClient client = new WebClient ();
    Uri uri = new Uri(address);

    client.UploadFileCompleted += new UploadFileCompletedEventHandler (UploadFileCallback2);

 // Specify a progress notification handler.
 client.UploadProgressChanged += new UploadProgressChangedEventHandler(UploadProgressCallback);
    client.UploadFileAsync (uri, "POST", fileName);
    Console.WriteLine ("File upload started.");
}


The following code example shows an implementation of a handler for this event.

static void UploadProgressCallback(object sender, UploadProgressChangedEventArgs e)
{
    // Displays the operation identifier, and the transfer progress.
    Console.WriteLine("{0}    uploaded {1} of {2} bytes. {3} % complete...", 
        (string)e.UserState, 
        e.BytesSent, 
        e.TotalBytesToSend,
        e.ProgressPercentage);
}
static void DownloadProgressCallback(object sender, DownloadProgressChangedEventArgs e)
{
    // Displays the operation identifier, and the transfer progress.
    Console.WriteLine("{0}    downloaded {1} of {2} bytes. {3} % complete...", 
        (string)e.UserState, 
        e.BytesReceived, 
        e.TotalBytesToReceive,
        e.ProgressPercentage);
}

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.

.NET Framework

Supported in: 2.0

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