SmtpClient.Send 正在运行，但 SmtpClient.SendMailAsync 无法在 smtp 上运行。office365.com

Question

我开发了两种方法：分别使用 SmtpClient.Send 和 SmtpClient.SendMailAsync 的 SendEmailBySmtp() 和 SendEmailAsyncBySmtp()。
目前第一种方法有效，但第二种方法无效不是。它没有错误，但没有电子邮件。
我该如何解决？

class Program
{
    static void Main(string[] args)
    {
        SendEmailBySmtp();
        SendEmailAsyncBySmtp();
    }

    static void SendEmailBySmtp()
    {
        MailMessage message = new MailMessage() 
        { 
            From = new MailAddress("test@example.com", "Test User"), 
            Subject = "Subject", 
            Body = "Body"
        };
        message.To.Add("test@example.com");
        message.CC.Add("test@example.com");
        message.BodyEncoding = UTF8Encoding.UTF8;
        message.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;
        using (SmtpClient client = new SmtpClient())
        {
            client.Port = 587;
            client.Host = "smtp.office365.com";
            client.EnableSsl = true;
            client.UseDefaultCredentials = false;
            client.Credentials = new System.Net.NetworkCredential("test@example.com", "password");
            client.Send(message);
        }
    }

    static async Task SendEmailAsyncBySmtp()
    {
        MailMessage message = new MailMessage()
        {
            From = new MailAddress("test@example.com", "Test User"),
            Subject = "Subject",
            Body = "Body"
        };
        message.To.Add("test@example.com");
        message.CC.Add("test@example.com");
        message.BodyEncoding = UTF8Encoding.UTF8;
        message.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;
        using (SmtpClient client = new SmtpClient())
        {
            client.Port = 587;
            client.Host = "smtp.office365.com";
            client.EnableSsl = true;
            client.UseDefaultCredentials = false;
            client.Credentials = new System.Net.NetworkCredential("test@example.com", "password");
            await client.SendMailAsync(message);
        }
    }
}

Answer 1

问题出在您忘记等待第二次调用的 Main 方法中。因为在 main 方法中你不能使用 await 关键字你必须手动 "await" 线程

像下面那样做:

    static void Main(string[] args)
    {
        SendEmailBySmtp();
        SendEmailAsyncBySmtp().GetAwaiter().GetResult();
    }

你的问题的答案是：程序在SendMailAsync完成工作之前结束，所以电子邮件发送操作在发送之前停止。

SmtpClient.Send 正在运行，但 SmtpClient.SendMailAsync 无法在 smtp 上运行。office365.com

SmtpClient.Send is working, but SmtpClient.SendMailAsync is not working on smtp.office365.com

c#

smtp

smtpclient