コード例 #1
0
        /// <summary>
        /// This method is called when asynchronous Connect method completes.
        /// </summary>
        /// <param name="ar">An IAsyncResult that stores state information and any user defined data for this asynchronous operation.</param>
        private void ConnectCallback(IAsyncResult ar)
        {
            try{
                m_pSmtpClient.EndConnect(ar);

                // Start TLS requested, start switching to SSL.
                if (m_pActiveTarget.SslMode == SslMode.TLS)
                {
                    m_pSmtpClient.BeginStartTLS(new AsyncCallback(this.StartTlsCallback), null);
                }
                // Authentication requested, start authenticating.
                else if (!string.IsNullOrEmpty(m_pActiveTarget.UserName))
                {
                    m_pSmtpClient.BeginAuthenticate(m_pActiveTarget.UserName, m_pActiveTarget.Password, new AsyncCallback(this.AuthenticateCallback), null);
                }
                else
                {
                    long messageSize = -1;
                    try{
                        messageSize = m_pRelayItem.MessageStream.Length - m_pRelayItem.MessageStream.Position;
                    }
                    catch {
                        // Stream doesn't support seeking.
                    }

                    m_pSmtpClient.BeginMailFrom(
                        this.From,
                        messageSize,
                        IsDsnSupported() ? m_pRelayItem.DSN_Ret : SMTP_DSN_Ret.NotSpecified,
                        IsDsnSupported() ? m_pRelayItem.EnvelopeID : null,
                        new AsyncCallback(this.MailFromCallback),
                        null
                        );
                }
            }
            catch (Exception x) {
                try{
                    // Release IP usage.
                    m_pServer.RemoveIpUsage(m_pActiveTarget.Target.Address);
                    m_pActiveTarget = null;

                    // Connect failed, if there are more target IPs, try next one.
                    if (!this.IsDisposed && !this.IsConnected && m_pTargets.Count > 0)
                    {
                        BeginConnect();
                    }
                    else
                    {
                        Dispose(x);
                    }
                }
                catch (Exception xx) {
                    Dispose(xx);
                }
            }
        }