S22.Imap 附件计数始终返回 0

Question

我正在尝试从存储在我的 Gmail 收件箱中的电子邮件中下载电子邮件附件。使用 S22.Imap 库 (https://github.com/smiley22/S22.Imap) 我得到消息列表，然后遍历它们以下载附件。我遇到的问题是 MailMessage.Attachments.Count 始终为 0，即使肯定有附加文件也是如此。这是我下载附件的代码。

            foreach (MailMessage m in messages)
            {
                if(m.Subject.Contains("Activity Statement") && (m.Attachments.Count > 0))
                {
                    foreach (Attachment a in m.Attachments)
                    {
                        var fileStream = File.Create(Properties.Settings.Default.ETL_ATTACHMENT_PROCESSING_DIR + a.Name);
                        a.ContentStream.Seek(0, SeekOrigin.Begin);
                        a.ContentStream.CopyTo(fileStream);
                        fileStream.Close();
                    }
                }
            }

Answer 1

你去吧..Net.Mail.Attachment.ContentStream 会给你一个流，你可以复制到一个文件中。要检查大小，请使用ContentStream.Length

foreach (Attachment attachment in message.Attachments)
{
    byte[] allBytes = new byte[attachment.ContentStream.Length];
    int bytesRead = attachment.ContentStream.Read(allBytes, 0, (int)attachment.ContentStream.Length);
    string destinationFile = @"C:\\Path\\" + attachment.Name;
    BinaryWriter writer = new BinaryWriter(new FileStream(destinationFile, FileMode.OpenOrCreate, FileAccess.Write, FileShare.None));
    writer.Write(allBytes);
    writer.Close();
}