我可以使用 MailKit 通过电子邮件发送文件吗?
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【中文标题】我可以使用 MailKit 通过电子邮件发送文件吗?【英文标题】:Can I send files via email using MailKit? 【发布时间】:2016-10-17 15:48:33 【问题描述】:如题,MailKit是否支持发送文件? 如果是,我该怎么做?
【问题讨论】:
【参考方案1】:是的。这在文档以及FAQ 中进行了解释。
来自常见问题解答:
如何创建带有附件的消息?
要构造带有附件的消息,您需要做的第一件事是创建一个multipart/mixed
容器,然后您需要首先将消息正文添加到该容器中。添加正文后,您可以向其中添加包含您要附加的文件内容的 MIME 部分,确保将 Content-Disposition
标头值设置为附件。您可能还想在Content-Disposition
标头上设置filename
参数以及在Content-Type
标头上设置name
参数。最方便的方法是简单地使用 MimePart.FileName 属性
将为您设置这两个参数,并将 Content-Disposition
标头值设置为 attachment
(如果尚未设置为其他值)。
var message = new MimeMessage ();
message.From.Add (new MailboxAddress ("Joey", "joey@friends.com"));
message.To.Add (new MailboxAddress ("Alice", "alice@wonderland.com"));
message.Subject = "How you doin?";
// create our message text, just like before (except don't set it as the message.Body)
var body = new TextPart ("plain")
Text = @"Hey Alice,
What are you up to this weekend? Monica is throwing one of her parties on
Saturday. I was hoping you could make it.
Will you be my +1?
-- Joey
"
;
// create an image attachment for the file located at path
var attachment = new MimePart ("image", "gif")
Content = new MimeContent (File.OpenRead (path)),
ContentDisposition = new ContentDisposition (ContentDisposition.Attachment),
ContentTransferEncoding = ContentEncoding.Base64,
FileName = Path.GetFileName (path)
;
// now create the multipart/mixed container to hold the message text and the
// image attachment
var multipart = new Multipart ("mixed");
multipart.Add (body);
multipart.Add (attachment);
// now set the multipart/mixed as the message body
message.Body = multipart;
构造带有附件的消息的一种更简单的方法是利用 BodyBuilder类。
var message = new MimeMessage ();
message.From.Add (new MailboxAddress ("Joey", "joey@friends.com"));
message.To.Add (new MailboxAddress ("Alice", "alice@wonderland.com"));
message.Subject = "How you doin?";
var builder = new BodyBuilder ();
// Set the plain-text version of the message text
builder.TextBody = @"Hey Alice,
What are you up to this weekend? Monica is throwing one of her parties on
Saturday. I was hoping you could make it.
Will you be my +1?
-- Joey
";
// We may also want to attach a calendar event for Monica's party...
builder.Attachments.Add (@"C:\Users\Joey\Documents\party.ics");
// Now we just need to set the message body and we're done
message.Body = builder.ToMessageBody ();
有关详细信息,请参阅Creating Messages。
【讨论】:
谢谢,File 运行良好。但是第二个示例的图像不如预期 我不明白这是什么意思。 我已经发送了文件,但是没有发送类型为图片的文件 如果您像示例中一样添加它,我保证它正在发送。 是的 - 只需将内容配置设置为内联【参考方案2】:@jstedfast 带来了非常酷的解决方案,这里有几个简单的方法示例,可以将文件作为附件发送(在这种情况下是 pdf 文档,但可以应用于任何文件类型)。
var message = new MimeMessage();
// add from, to, subject and other needed properties to your message
var builder = new BodyBuilder();
builder.htmlBody = htmlContent;
builder.TextBody = textContent;
// you can either create MimeEntity object(s)
// this might get handy in case you want to pass multiple attachments from somewhere else
byte[] myFileAsByteArray = LoadMyFileAsByteArray();
var attachments = new List<MimeEntity>
// from file
MimeEntity.Load("myFile.pdf"),
// file from stream
MimeEntity.Load(new MemoryStream(myFileAsByteArray)),
// from stream with a content type defined
MimeEntity.Load(new ContentType("application", "pdf"), new MemoryStream(myFileAsByteArray))
// or add file directly - there are a few more overloads to this
builder.Attachments.Add("myFile.pdf");
builder.Attachments.Add("myFile.pdf", myFileAsByteArray);
builder.Attachments.Add("myFile.pdf", myFileAsByteArray , new ContentType("application", "pdf"));
// append previously created attachments
foreach (var attachment in attachments)
builder.Attachments.Add(attachment);
message.Body = builder.ToMessageBody();
希望对你有帮助。
【讨论】:
【参考方案3】:您也可以直接使用这种方法发送多个文件。 **注意:这里使用的文件是 IEnumerable 文件**
try
var message = new MimeMessage();
message.From.Add(new MailboxAddress(emailService.FromFullName, emailService.FromEmail));
message.To.AddRange(emailsToSend.Select(x => new MailboxAddress(x)));
message.Subject = subject;
var builder = new BodyBuilder();
builder.HtmlBody = body;
foreach (var attachment in files)
if (attachment.Length > 0)
string fileName = Path.GetFileName(attachment.FileName);
builder.Attachments.Add(fileName, attachment.OpenReadStream());
message.Body = builder.ToMessageBody();
【讨论】:
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