private void AsyncReadMessage(object state)
{
ReadMessageAsyncResult ar = (ReadMessageAsyncResult)state;
try {
PmlElement message = ReadMessage();
ar.SetCompleted(false, null, message);
} catch (Exception ex) {
ar.SetCompleted(false, ex, null);
}
}
public IAsyncResult BeginReadMessage(AsyncCallback callback, object state)
{
ReadMessageAsyncResult ar;
Boolean completed = false;
lock (_queue) {
if (!IsOpen)
{
throw new InvalidOperationException("The channel is not open");
}
if (_asyncWait != null)
{
throw new InvalidOperationException("Another asynchronous operation is in progress");
}
ar = new ReadMessageAsyncResult(callback, state);
if (_queue.Count == 0)
{
_asyncWait = ar;
}
else
{
ar.Message = _queue.Dequeue();
completed = true;
}
}
if (completed)
{
ar.SetCompleted(true, null);
}
return(ar);
}