Question

我使用以下代码发送邮件。但我只能添加一个附件。我想用一封邮件添加超过30个附件。我怎么解决这个问题。请帮帮我。

string fromEmail = "abcd@gmail.com ";
mail_add=recever@gmail.com
MailMessage mailMessage = new MailMessage(fromEmail, mail_add, subject, subject);
System.Net.Mail.Attachment attachement;

attachement = new System.Net.Mail.Attachment("path_with_xl_file");

mailMessage.Attachments.Add(attachement);
mailMessage.Body = body;
MailAddress copy = new MailAddress(fromEmail );
mailMessage.CC.Add(copy);
SmtpClient smtpClient = new SmtpClient();
smtpClient.Host = "smtp.gmail.com";
smtpClient.Port = 587
smtpClient.EnableSsl = false;
smtpClient.UseDefaultCredentials = false;
smtpClient.Credentials = new NetworkCredential(fromEmail, "mis123");

try
{
    smtpClient.Send(mailMessage);   
}

Answer 1

您可以多次执行mailMessage.Attachments.Add：

mailMessage.Attachments.Add(new System.Net.Mail.Attachment("path_with_xl_file"));
mailMessage.Attachments.Add(new System.Net.Mail.Attachment("path_with_xl_file_2"));
mailMessage.Attachments.Add(new System.Net.Mail.Attachment("path_with_xl_file_3"));
mailMessage.Attachments.Add(new System.Net.Mail.Attachment("path_with_xl_file_4"));

当然，您可以通过使用数组，循环和其他语言工具来简化此代码。这取决于您如何在程序中存储这30个文件例如，如果将所有路径存储在string数组中，则可以执行以下操作：

string[] pathes = /* ... */;
foreach (var path in pathes)
{
    mailMessage.Attachments.Add(new System.Net.Mail.Attachment(path));
}

Answer 2

以下是执行此操作的示例代码。此代码假定您已经将一组文件路径转换为Attachments。

        private static void SendEmail(IEnumerable<string> attachmentFilePaths)
        {
            string fromEmail = "abcd@gmail.com ";
            string mail_add = "recever@gmail.com";
            string subject = "hello";
            string body = "How are you?";

            try
            {
                using (MailMessage mailMessage = new MailMessage(fromEmail, mail_add, subject, body))
                {
                    foreach (var attachmentFilePath in attachmentFilePaths)
                    {
                        if (File.Exists(attachmentFilePath))
                        {
                            Attachment attachement = new Attachment(attachmentFilePath);
                            mailMessage.Attachments.Add(attachement);
                        }
                    }

                    MailAddress copy = new MailAddress(fromEmail);
                    mailMessage.CC.Add(copy);
                    using (SmtpClient smtpClient = new SmtpClient())
                    {
                        smtpClient.Host = "smtp.gmail.com";
                        smtpClient.Port = 587;
                        smtpClient.EnableSsl = false;
                        smtpClient.UseDefaultCredentials = false;
                        smtpClient.Credentials = new NetworkCredential(fromEmail, "mis123");
                        smtpClient.Send(mailMessage);
                    }
                }
            }catch (Exception ex)
            {
                Debug.WriteLine(ex.Message);
            }
        }

在一封电子邮件中添加多个附件

2 个答案: