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WebClient.UploadProgressChanged Event

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

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.");
    }
// Sample call: UploadFileInBackground2("http://www.contoso.com/fileUpload.aspx", "data.txt")
void UploadFileInBackground2 (String* address, String* fileName)
{
    WebClient* client = new WebClient ();

    client->UploadFileCompleted += new UploadFileCompletedEventHandler (UploadFileCallback2);

    // Specify a progress notification handler.
    client->UploadProgressChanged += new UploadProgressEventHandler(UploadProgressCallback);
    client->UploadFileAsync (address, S"POST", fileName);
    Console::WriteLine (S"File upload started.");
}

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

private 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);
}
private 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);
}
void UploadProgressCallback(Object* /*sender*/, UploadProgressEventArgs* e)
{
    // Displays the operation identifier, and the transfer progress.
    Console::WriteLine(S"{0}    transferred {1} of {2} bytes. {3} % complete...", 
        dynamic_cast<String*>(e->UserToken),
        __box(e->BytesSent),
        __box(e->TotalBytesToSend),
        __box(e->ProgressPercentage));
}
void DownloadProgressCallback(Object* /*sender*/, DownloadProgressEventArgs* e)
{
    // Displays the operation identifier, and the transfer progress.
    Console::WriteLine(S"{0}    transferred {1} of {2} bytes. {3} % complete...", 
        dynamic_cast<String*>(e->UserToken),
        __box(e->BytesReceived),
        __box(e->TotalBytesToReceive),
        __box(e->ProgressPercentage));
}

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0

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