如何在 asp.net 核心网站 API 中使用 MimeMessage 发送带附件的电子邮件？

Question

我试过只使用简单的文本，但我想发送带附件的电子邮件。

    var emailMessage = new MimeMessage();
    emailMessage.From.Add(new MailboxAddress("Test","test@gmail.com"));
    emailMessage.To.Add(new MailboxAddress("Demo", "demo@gmail.com"));
    emailMessage.Subject = "Hello";
    emailMessage.Body = new TextPart("html") { Text = "Hi............" };

//我想要带正文的附件..

    //Send Email.
    using (var client = new SmtpClient())
    {
            await client.ConnectAsync("smtp.gmail.com", 587, false);
            client.AuthenticationMechanisms.Remove("XOAUTH2");
            await client.AuthenticateAsync("uid", "pass");
            await client.SendAsync(emailMessage);
            await client.DisconnectAsync(true);
    }

Answer 1

    var multipart = new Multipart("mixed");
    multipart.Add(new TextPart("html") { Text = "your body message"});

    // create an image attachment for the file located at path
    var attachment = new MimePart ("image", "gif") {
       ContentObject = new ContentObject (File.OpenRead (path), ContentEncoding.Default),
       ContentDisposition = new ContentDisposition (ContentDisposition.Attachment),
       ContentTransferEncoding = ContentEncoding.Base64,
       FileName = Path.GetFileName (path)
    };

    multipart.Add(attachment);
    emailMessage.Body = multipart;

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