//must be called under a lock in receive loop
public IAsyncResult BeginReceiveFrom(byte[] buffer, int offset, int size, ref EndPoint remoteEndPoint, AsyncCallback callback, object state)
{
UdpUtility.ValidateBufferBounds(buffer, offset, size);
ThrowIfNotOpen();
bool success = false;
IAsyncResult asyncResult = null;
try
{
this.pendingReceiveCount++;
asyncResult = new ReceiveFromAsyncResult(
this.socket,
new ArraySegment <byte>(buffer, offset, size),
remoteEndPoint,
size - offset,
this.timeToLive,
callback,
state);
success = true;
return(asyncResult);
}
finally
{
if (!success)
{
this.pendingReceiveCount--;
}
}
}
public static ArraySegment <byte> End(IAsyncResult result, ref EndPoint remoteEndPoint)
{
ArraySegment <byte> data = TypedAsyncResult <ArraySegment <byte> > .End(result);
ReceiveFromAsyncResult receiveFromResult = (ReceiveFromAsyncResult)result;
remoteEndPoint = receiveFromResult.RemoteEndPoint;
return(data);
}
static void OnReceiveMessageFrom(IAsyncResult result)
{
if (result.CompletedSynchronously)
{
return;
}
ReceiveFromAsyncResult asyncResult = (ReceiveFromAsyncResult)result.AsyncState;
Exception completionException = null;
ArraySegment <byte> data = default(ArraySegment <byte>);
try
{
data = asyncResult.EndReceiveFrom(result);
}
catch (SocketException socketException)
{
completionException = UdpSocket.ConvertNetworkError(socketException, asyncResult);
}
catch (Exception exception)
{
if (Fx.IsFatal(exception))
{
throw;
}
completionException = exception;
}
if (completionException != null)
{
asyncResult.Complete(false, completionException);
}
else
{
asyncResult.Complete(data, false);
}
}
static Exception ConvertNetworkError(SocketException socketException, ReceiveFromAsyncResult result)
{
return(ConvertNetworkError(socketException, result.MessageSize, TransferDirection.Receive, result.TimeToLive));
}
//must be called under a lock in receive loop
public ArraySegment <byte> EndReceiveFrom(IAsyncResult result, ref EndPoint remoteEndPoint)
{
this.pendingReceiveCount--;
return(ReceiveFromAsyncResult.End(result, ref remoteEndPoint));
}
