C# 使用System.Net.Mail发送带有附件的电子邮件

我正在使用System.Net.Mail通过我的应用程序发送电子邮件。我试图发送带有以下代码的附件的电子邮件

    Collection<string> MailAttachments = new Collection<string>();
    MailAttachments.Add("C:\\Sample.JPG");
    mailMessage = new MailMessage();
    foreach (string filePath in emailNotificationData.MailAttachments)
    {
      FileStream fileStream = File.OpenWrite(filePath);
      using (fileStream)
       {
        Attachment attachment = new Attachment(fileStream, filePath);
        mailMessage.Attachments.Add(attachment);
       }
    }
     SmtpClient smtpClient = new SmtpClient();
     smtpClient.Host = SmtpHost;
     smtpClient.Send(mailMessage);

---

using

语句的结尾大括号关闭文件流：

using (fileStream)
{
    Attachment attachment = new Attachment(fileStream, filePath);
    mailMessage.Attachments.Add(attachment);
}  // <-- file stream is closed here

---

使用此解决方案，.NET库将不得不担心打开、读取和关闭文件。

完成…我已删除文件流

using (fileStream)
{
    Attachment attachment = new Attachment(fileStream, filePath);
    mailMessage.Attachments.Add(attachment);
}  // <-- file stream is closed here

Collection<string> MailAttachments = new Collection<string>();
MailAttachments.Add("C:\\Sample.JPG");

mailMessage = new MailMessage();
foreach (string filePath in emailNotificationData.MailAttachments)
{
    Attachment attachment = new Attachment(filePath);
    mailMessage.Attachments.Add(attachment);
}
SmtpClient smtpClient = new SmtpClient();
smtpClient.Host = SmtpHost;
smtpClient.Send(mailMessage);