c# – 使用MailKit / MimeKit从电子邮件中删除附件

我正在使用MailKit库来处理电子邮件,这些电子邮件运行良好.但是,我正在尝试将电子邮件拆分为其组成文件a)主电子邮件(无附件)b)单个附件文件,存储在文件系统上.

我可以单独保存附件,但似乎无法从电子邮件正文代码中删除它们.即它们与主电子邮件一起保存,因此重复数据. ：/

我试过了：

foreach (MimePart part in inMessage.BodyParts)
{ 
    if (part.IsAttachment)
    {
        // Remove MimePart    < This function isn't available on the collection.
    }
}

也尝试过：

var builder = new BodyBuilder();
foreach (MimePart part in inMessage.BodyParts)
{ 
    if (!part.IsAttachment)
    {
        // Add MimeParts to collection    < This function isn't available on the collection.
    }
}
outMessage.Body = builder.ToMessageBody();

如果有人可以帮忙解决这个问题,我会非常感激.

解决方案实施FYI：

private string GetMimeMessageOnly(string outDirPath)
        {
            MimeMessage message = (Master as fsEmail).GetMimeMessage();

            if (message.Attachments.Any())
            {
                var multipart = message.Body as Multipart;
                if (multipart != null)
                {
                    while (message.Attachments.Count() > 0)
                    {
                        multipart.Remove(message.Attachments.ElementAt(0));
                    }
                }
                message.Body = multipart;
            }

            string filePath = outDirPath + Guid.NewGuid().ToString() + ".eml";
            Directory.CreateDirectory(Path.GetDirectoryName(outDirPath));
            using (var cancel = new System.Threading.CancellationTokenSource())
            {    
                using (var stream = File.Create(filePath)) 
                {
                    message.WriteTo(stream, cancel.Token);
                }
            }
            return filePath;
        }

并且仅获取附件：

private List<string> GetAttachments(string outDirPath)
        {
            MimeMessage message = (Master as fsEmail).GetMimeMessage();

            List<string> list = new List<string>();
            foreach (MimePart attachment in message.Attachments)
            {
                using (var cancel = new System.Threading.CancellationTokenSource())
                {
                    string filePath = outDirPath + Guid.NewGuid().ToString() + Path.GetExtension(attachment.FileName);
                    using (var stream = File.Create(filePath))
                    {
                        attachment.ContentObject.DecodeTo(stream, cancel.Token);
                        list.Add(filePath);
                    }
                }
            }
            return list;
        }

解决方法:

您可以检索作为附件https://github.com/jstedfast/MimeKit/blob/master/MimeKit/MimeMessage.cs#L734的所有MimePart,然后遍历所有Multiparts并调用https://github.com/jstedfast/MimeKit/blob/master/MimeKit/Multipart.cs#L468以移除附件.

下面的示例对邮件做了一些假设,例如：只有一个Multipart,一些电子邮件客户端(Outlook)非常有创意如何制作邮件.

static void Main(string[] args)
{
    var mimeMessage = MimeMessage.Load(@"x:\sample.eml");
    var attachments = mimeMessage.Attachments.ToList();
    if (attachments.Any())
    {
        // Only multipart mails can have attachments
        var multipart = mimeMessage.Body as Multipart;
        if (multipart != null)
        {
            foreach(var attachment in attachments)
            {
                multipart.Remove(attachment);
            }
        }
        mimeMessage.Body = multipart;
    }
    mimeMessage.WriteTo(new FileStream(@"x:\stripped.eml", FileMode.CreateNew));
}

标签：c,mime,email,mailkit
来源： https://codeday.me/bug/20190717/1490876.html