WebClient::UploadProgressChanged Event
Occurs when an asynchronous upload operation successfully transfers some or all of the data.
Assembly: System (in System.dll)
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 |
|---|---|
Sends a Byte array to the resource, without blocking the calling thread. | |
Sends a local file to the resource, without blocking the calling thread. | |
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") void UploadFileInBackground2( String^ address, String^ fileName ) { WebClient^ client = gcnew WebClient; Uri ^uri = gcnew Uri(address); client->UploadFileCompleted += gcnew UploadFileCompletedEventHandler (UploadFileCallback2); // Specify a progress notification handler. client->UploadProgressChanged += gcnew 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 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.