C#中如何添加附件到SMTP邮件

您可以使用System.Net.Mail命名空间中的SmtpClient类来发送带有附件的邮件。以下是一个示例代码，演示如何添加附件到SMTP邮件：

using System;using System.Net;using System.Net.Mail;class Program{    static void Main()    {        // 发件人邮箱和密码        string from = "your-email@example.com";        string password = "your-password";        // 创建邮件对象        MailMessage mail = new MailMessage();        mail.From = new MailAddress(from);        mail.To.Add("recipient@example.com");        mail.Subject = "Test Email with Attachment";        mail.Body = "This is a test email with attachment";        // 添加附件        Attachment attachment = new Attachment("path-to-your-attachment-file");        mail.Attachments.Add(attachment);        // 发送邮件        SmtpClient client = new SmtpClient("smtp.example.com");        client.Port = 587;        client.Credentials = new NetworkCredential(from, password);        client.EnableSsl = true;        try        {            client.Send(mail);            Console.WriteLine("Email sent successfully.");        }        catch (Exception ex)        {            Console.WriteLine("An error occurred: " + ex.Message);        }    }}

在上面的代码中，您需要将"your-email@example.com"和"your-password"替换为您的发件人邮箱和密码，将"recipient@example.com"替换为收件人邮箱，将"path-to-your-attachment-file"替换为附件文件的路径。然后，您可以运行该代码来发送带有附件的邮件。