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 NIB: 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 Shared Sub UploadFileInBackground2(ByVal address As String, ByVal fileName As String) Dim client As WebClient = New WebClient() Dim uri as Uri = New Uri(address) AddHandler client.UploadFileCompleted, AddressOf UploadFileCallback2 ' Specify a progress notification handler. AddHandler client.UploadProgressChanged, AddressOf UploadProgressCallback client.UploadFileAsync(uri, "POST", fileName) Console.WriteLine("File upload started.") End Sub
The following code example shows an implementation of a handler for this event.
Private Shared Sub UploadProgressCallback(ByVal sender As Object, ByVal e As UploadProgressChangedEventArgs) ' Displays the operation identifier, and the transfer progress. Console.WriteLine("{0} uploaded {1} of {2} bytes. {3} % complete...", _ CStr(e.UserState), e.BytesSent, e.TotalBytesToSend, e.ProgressPercentage) End Sub Private Shared Sub DownloadProgressCallback(ByVal sender As Object, ByVal e As DownloadProgressChangedEventArgs) ' Displays the operation identifier, and the transfer progress. Console.WriteLine("0} downloaded 1} of 2} bytes. 3} % complete...", _ CStr(e.UserState), e.BytesReceived, e.TotalBytesToReceive, e.ProgressPercentage) End Sub
Available since 2.0
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0