OpenWriteCompletedEventHandler Delegate
.NET Framework 4.5
Represents the method that will handle the OpenWriteCompleted event of a WebClient.
Assembly: System (in System.dll)
public delegate void OpenWriteCompletedEventHandler( Object sender, OpenWriteCompletedEventArgs e )
Parameters
- sender
- Type: System.Object
The source of the event.
- e
- Type: System.Net.OpenWriteCompletedEventArgs
A OpenWriteCompletedEventArgs containing event data.
The following code example demonstrates opening a stream to write data to be uploaded.
public static void OpenResourceForPosting (string address)
{
WebClient client = new WebClient ();
Uri uri = new Uri(address);
// Specify that the OpenWriteCallback method gets called
// when the writeable stream is available.
client.OpenWriteCompleted += new OpenWriteCompletedEventHandler (OpenWriteCallback2);
client.OpenWriteAsync (uri);
// Applications can perform other tasks
// while waiting for the upload to complete.
}
The following method is called when the stream is available.
private static void OpenWriteCallback2 (Object sender, OpenWriteCompletedEventArgs e)
{
Stream body = null;
StreamWriter s = null;
try
{
body = (Stream)e.Result;
s = new StreamWriter (body);
s.AutoFlush = true;
s.Write ("This is content data to be sent to the server.");
}
finally
{
if (s != null)
{
s.Close ();
}
if (body != null)
{
body.Close ();
}
}
}
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
