如何在MVC .Net中以邮件形式发送文件(网址)

public void SendEmailWithAttachment(string recipientEmail, string subject, string body, string attachmentUrl)
{
    using (MailMessage mail = new MailMessage())
    {
        mail.From = new MailAddress("your-email@example.com");
        mail.To.Add(recipientEmail);
        mail.Subject = subject;
        mail.Body = body;

        // 创建一个附件对象
        Attachment attachment = new Attachment(attachmentUrl);

        // 将附件添加到邮件中
        mail.Attachments.Add(attachment);

        // 配置SMTP客户端
        using (SmtpClient smtp = new SmtpClient("smtp.example.com", 587))
        {
            smtp.Credentials = new NetworkCredential("your-email@example.com", "your-password");
            smtp.EnableSsl = true;

            // 发送邮件
            smtp.Send(mail);
        }
    }
}

string recipientEmail = "recipient@example.com";
string subject = "邮件主题";
string body = "邮件正文";
string attachmentUrl = "http://example.com/file.pdf";

SendEmailWithAttachment(recipientEmail, subject, body, attachmentUrl);