/// <summary>
///
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void MailSendCompleted(object sender, AsyncCompletedEventArgs e)
{
SmtpClient client = sender as SmtpClient;
if (client != null)
{
client.SendCompleted -= MailSendCompleted;
}
object userToken = e.UserState;
SendCompletedToken token = e.UserState as SendCompletedToken;
if (token != null)
{
userToken = token.UserToken;
}
if (e.Error != null && !e.Cancelled && token != null)
{
if ((++token.Index) < token.MxRecords.Length)
{
//继续连接下一个MX Record
SmtpClient smtp = this.GetSmtpClient(token.MxRecords[token.Index], token.Port);
smtp.SendCompleted += MailSendCompleted;
smtp.SendAsync(token.Message, token);
return;
}
}
AsyncCompletedEventArgs args = new AsyncCompletedEventArgs(e.Error, e.Cancelled, userToken);
if (this.SendCompleted != null)
{
this.SendCompleted(sender, args);
}
}
/// <summary>
/// 异步发送邮件,如果发送过程出现错误则会抛出异常
/// </summary>
/// <param name="message">邮件内容</param>
/// <param name="userToken">一个用户定义对象，此对象将被传递给完成异步操作时所调用的方法。</param>
public void SendAsync(MailMessage message, object userToken)
{
if (this.Server.UseLocalService) //采用本地邮件服务
{
if (message.To.Count < 1)
{
return;
}
try
{
string[] mailMX = DnsMxRecord.Query(message.To[0]);
if (mailMX != null && mailMX.Length > 0)
{
this.BeforeLocalSend(message);
SendCompletedToken token = new SendCompletedToken()
{
MxRecords = mailMX,
Index = 0,
Port = MailServer.DefaultPort,
Message = message,
UserToken = userToken
};
//构造SMTP的连接器
SmtpClient smtp = this.GetSmtpClient(mailMX[token.Index], token.Port);
smtp.SendCompleted += MailSendCompleted;
smtp.SendAsync(message, token);
}
}
catch { }
}
else
{
//构造SMTP的连接器
SmtpClient smtp = this.GetSmtpClient(this.Server.HostName, this.Server.Port);
smtp.SendCompleted += this.SendCompleted;
smtp.SendAsync(message, userToken);
}
}
