c# – 如何将字节数组转换为邮件附件

我有字节数组,它本质上是从数据库检索的编码的.docx.我尝试将此字节[]转换为原始文件,并将其作为邮件的附件,而不必首先将其作为文件存储在磁盘上.
什么是最好的方法呢？

public MailMessage ComposeMail(string mailFrom,string mailTo,string copyTo,byte[] docFile)
{
    var mail = new MailMessage();

    mail.From = new MailAddress(mailFrom);

    mail.To.Add(new MailAddress(mailTo));
    mail.Body = "mail with attachment";

    System.Net.Mail.Attachment attachment;

    //Attach the byte array as .docx file without having to store it first as a file on disk?
    attachment = new System.Net.Mail.Attachment("docFile");
    mail.Attachments.Add(attachment);

    return mail;
}

解决方法

附件中有一个 overload of the constructor需要流.您可以通过使用byte []构建一个 MemoryStream来直接传入文件：

MemoryStream stream = new MemoryStream(docFile);
Attachment attachment = new Attachment(stream,"document.docx");

第二个参数是文件的名称,从中将推断mime类型.一旦你完成它,请记住在MemoryStream上调用Dispose().