c# - 如何发送邮件异步

Question

我在尝试发送电子邮件异步时遇到了问题，我发现 Stackoverflow 上没有帖子，但没有一个有用。我有以下代码块

public class EmailService : IIdentityMessageService
{
    public Task SendAsync(IdentityMessage message)
    {
        // Plug in your email service here to send an email.

        var mailMessage = new MailMessage
            ("me@example.com", message.Destination, message.Subject, message.Body);

        mailMessage.IsBodyHtml = true;

        var client = new SmtpClient();

        client.SendCompleted += (s, e) => client.Dispose();
        client.SendAsync(mailMessage,null);
        return Task.FromResult(0);
    }
}

我收到一封电子邮件，但在运行这段代码时出现异常

an asynchronous module or handler completed while an asynchronous operation was still pending.

有什么建议吗？

Answer 1

使用SendMailAsync而不是 SendAsync:

public class EmailService : IIdentityMessageService
{
    public async Task SendAsync(IdentityMessage message)
    {
        // Plug in your email service here to send an email.

        var mailMessage = new MailMessage
            ("me@example.com", message.Destination, message.Subject, message.Body);

        mailMessage.IsBodyHtml = true;

        using(var client = new SmtpClient())
        {
            await client.SendMailAsync(mailMessage);
        }
    }
}