Asp.Net Identity 2.0 – 如何使用SmtpClient实现IIdentityMessageService来执行异步SMTP?

我已经为Asp.Net Identity 2.0实现了一个简单的EmailService(通过IIdentityMessageService接口。

  public class EmailService : IIdentityMessageService { public Task SendAsync(IdentityMessage message) { // convert IdentityMessage to a MailMessage var email = new MailMessage(new MailAddress("noreply@mydomain.com", "(do not reply)"), new MailAddress(message.Destination)) { Subject = message.Subject, Body = message.Body, IsBodyHtml = true }; using (var client = new SmtpClient()) // SmtpClient configuration comes from config file { return client.SendMailAsync(email); } } } 

要发送电子邮件,我将通过UserManager:

await _userManager.SendEmailAsync(user.Id, "Confirm your account","Please confirm your account by clicking this link: link");

问题是,当我调用SendEmailAsync()时,我得到一个System.Threading.Tasks.TaskCanceledException ,并且不清楚为什么。

如果我同步发送电子邮件( client.Send(email) ),一切正常。

所以我的问题是:

  • 如何防止TaskCanceledException被抛出? (假设我可以克服这个错误),

  • 如何在电子邮件发送回客户端时传递错误(即,“此处没有此类用户”类型的响应来自SmtpClient?

您的问题是在发送电子邮件之前处理了SmtpClient

两种方式:

  • 等待SendMailAsync结果

     using (var client = new SmtpClient()) { await client.SendMailAsync(email); } 
  • 注册SendCompleted事件并仅在发送消息后处置SmtpClient

     var client = new SmtpClient(); client.SendCompleted += (s, e) => { client.Dispose(); }; return client.SendMailAsync(message); 

您必须在方法上放置异步。

  public async Task SendAsync(IdentityMessage message) { using (SmtpClient client = new SmtpClient()) { using (var mailMessage = new MailMessage("your@email.com", message.Destination, message.Subject, message.Body)) { await client.SendMailAsync(mailMessage); } } } }