如何在剃刀页面发送的电子邮件中添加文件附件(使用ASP.NET核心和MailKit)

var message = new MimeMessage();
message.From.Add(new MailboxAddress("发件人姓名", "发件人邮箱"));
message.To.Add(new MailboxAddress("收件人姓名", "收件人邮箱"));
message.Subject = "邮件主题";
message.Body = new TextPart("plain")
{
    Text = "邮件正文"
};

var attachment = new MimePart("application", "octet-stream")
{
    Content = new MimeContent(File.OpenRead("文件路径")),
    ContentDisposition = new ContentDisposition(ContentDisposition.Attachment),
    FileName = "文件名"
};

message.Attachments.Add(attachment);

using (var client = new SmtpClient())
{
    client.Connect("SMTP服务器地址", 端口号, false);
    client.Authenticate("用户名", "密码");
    client.Send(message);
    client.Disconnect(true);
}