internal static IAsyncResult BeginSend(SmtpConnection conn, AsyncCallback callback, object state)
{
MultiAsyncResult multiResult = new MultiAsyncResult(conn, callback, state);
multiResult.Enter();
IAsyncResult writeResult = conn.BeginFlush(s_onWrite, multiResult);
if (writeResult.CompletedSynchronously)
{
conn.EndFlush(writeResult);
multiResult.Leave();
}
SmtpReplyReader reader = conn.Reader.GetNextReplyReader();
multiResult.Enter();
//this actually does a read on the stream.
IAsyncResult result = reader.BeginReadLine(s_onReadLine, multiResult);
if (result.CompletedSynchronously)
{
LineInfo info = reader.EndReadLine(result);
if (!(multiResult.Result is Exception))
{
multiResult.Result = info;
}
multiResult.Leave();
}
multiResult.CompleteSequence();
return(multiResult);
}
private void Handshake()
{
_connection._responseReader = new SmtpReplyReaderFactory(_connection._networkStream);
SmtpReplyReader reader = _connection.Reader.GetNextReplyReader();
IAsyncResult result = reader.BeginReadLine(s_handshakeCallback, this);
if (!result.CompletedSynchronously)
{
return;
}
LineInfo info = reader.EndReadLine(result);
if (info.StatusCode != SmtpStatusCode.ServiceReady)
{
throw new SmtpException(info.StatusCode, info.Line, true);
}
try
{
if (!SendEHello())
{
return;
}
}
catch
{
if (!SendHello())
{
return;
}
}
}