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。