考虑以下代码:
public async Task<Status> SendMessage(Message message)
{
List<IMessage> _messageDispatchers = new List<IMessage>();
try
{
Object[] args = new Object[] { _message };
IMessage endpoint = (IMessage)Activator.CreateInstance(Type.GetType(_message.AgentDLLName), args);
_messageDispatchers.Add(endpoint);
foreach (IMessage dispatcher in _messageDispatchers)
{
await Task.Run(() => dispatcher.SendMessage(_message));
}
return await Task.Run(() => Status.Success);
}
catch (Exception ex)
{
logger.Log(LoggerLevel.Error, ex.Message);
return Status.EmailSendingFailed;
}
}
SendMessage:
public async Task<Status> SendMessage(OutboundMessage outboundmessage)
{
string strMessage = string.Empty;
string subject = string.Empty;
MessageServices objService = new MessageServices();
try
{
var config = (from SmtpConfigurationElement ms in AppConfiguration.Instance.Smtps
where ms.Key == "smtp"
select ms).Single();
SmtpClient smtpClient = new SmtpClient(config.Host);
smtpClient.Port = Convert.ToInt32(config.port);
smtpClient.EnableSsl = true;
smtpClient.Credentials = new NetworkCredential(config.UserName, config.Password);
string[] strToList = outboundmessage.ToList.Split(';');
MailMessage mail = new MailMessage();
mail.From = new MailAddress(outboundmessage.FromAddress);
if (strToList.Length > 0)
{
for (int j = 0; j < strToList.Length; j++)
{
mail.To.Add(strToList[j]);
}
}
else
{
_LOGGER.Log(LoggerLevel.Information, "SMTP Mail Send failed as ToList is not correct");
return Status.Failed;
}
if (!string.IsNullOrEmpty(outboundmessage.CCList))
{
string[] strCCList = outboundmessage.CCList.Split(';');
if (strCCList.Length > 0)
{
for (int k = 0; k < strCCList.Length; k++)
{
mail.CC.Add(strToList[k]);
}
}
}
if (!string.IsNullOrEmpty(outboundmessage.Attachments))
{
System.Net.Mail.Attachment attachment;
attachment = new System.Net.Mail.Attachment(outboundmessage.Attachments);
mail.Attachments.Add(attachment);
}
strMessage = await objService.ReplaceMessageWithPlaceholders(outboundmessage.PlaceholderValues, outboundmessage.MessageBody);
subject = await objService.ReplaceMessageWithPlaceholders(outboundmessage.PlaceholderValues, outboundmessage.Subject);
mail.Body = strMessage;
mail.Subject = subject;
mail.IsBodyHtml = true;
await Task.Run(() => smtpClient.Send(mail));
return Status.Success;
}
catch (Exception ex)
{
return Status.Failed;
}
}
调用SendMessage:
public Status MarketingEmail(OutboundMessage _message)
{
try
{
_message.MessageCreatedDate = System.DateTime.Now;
processor.SendMessage(_message);
return Status.Success;
}
catch (Exception ex)
{
_LOGGER.Log(LoggerLevel.Error, "Error in Marketing Email" + ex.ToString());
return Status.InsertFailed;
}
}
整个想法是建立一个工作流程,在这个工作流程中,发送电子邮件是最后一项任务,而且应该是一件轻松的事情。
现在对processor.SendMessage(_message)的调用有这样的建议:
因为没有等待此调用,所以执行当前方法 在通话结束前继续。考虑应用'await' 运算符到调用的结果。
自async&amp; amp;等待需要一起使用。
问题:
答案 0 :(得分:4)
当前的方法将“有效”,因为它将继续return Status.Success;
,而无需等待processor.SendMessage(_message);
的调用完成。
但是,因为那次电话被解雇了忘了,SendMessage
重载没有在catch
块中进行任何记录,您可能会遇到无法发送电子邮件但没有人收到通知的风险。
异步电子邮件发送的常见方法是:将电子邮件存储在其他位置(通常是邮件队列或数据库),然后设置一个单独的异步进程来读取排队的电子邮件并发送它们。如果成功,则将电子邮件标记为已发送。如果失败,它会再次尝试(直到某个时间限制或重试次数),然后如果它放弃,它可以触发通知或设置一个可以在以后检查的标志。
然后你的代码基本上会说“好吧,电子邮件已成功排队”,而不是“好的,电子邮件已发送”。将实际发送移至单独的流程更加可靠。