有没有办法知道哪个Content-Type是System.Net.Mail.MailMessage的主体? [英] Is there a way to know which Content-Type is the body of System.Net.Mail.MailMessage?
问题描述
你好，我有点死胡同了.
我有以下EML:
这是我的eml文件的一部分:
hello, i''m a bit in a dead end here.
i have the following EML:
this is part of my eml file:
------=_NextPart_001_0046_01CD587D.979ABFF0
Content-Type: text/plain;
charset="us-ascii"
Content-Transfer-Encoding: 7bit
aaaaaaaaaaa
------=_NextPart_001_0046_01CD587D.979ABFF0
Content-Type: text/html;
charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
<html xmlns:v=3D"urn:schemas-microsoft-com:vml" =
...
...
如您所见，我有一个正文(HTML)和一个备用视图(纯文本).
外部插件将整个EML解析为MailMessage对象.
问题是，我不知道我的身体是什么类型? (可以是html/plain/richtext/xml).
MailMessage具有isBodyHtml，可以很好地了解它的html，但如果它为false，则它可以是纯文本/richtext/xml，我需要知道它是什么
任何帮助将不胜感激.
谢谢！
as you can see, i have a body (which is HTML), and an alternate view (plain text).
outside plugin parses the entire EML into a MailMessage object.
the problem is, i have no idea what type is my body? (it can be html/plain/richtext/xml).
the MailMessage has isBodyHtml, which is fine to know if its html, but if its false - then it can be either plaintext/richtext/xml, and i need to know what is it
any help will be appreciated.
thanks!
推荐答案
由于它来自另一方，因此您不能依赖于哑剧类型.
嗅探数据流以确定其内容类型并不容易.它依赖于文件签名知识库，在此进行描述: http://www.garykessler.net/library/file_sigs.html [^ ]
urlmon.dll中有一个FindMimeFromData()函数，但这是非托管代码，因此您需要PInvoke，请参阅:魔术数字 [
这可能对您也很有趣:小型内容检测库 [ ^ ]
As it comes from another party you can not rely on mime types told it.
Sniffing a data stream to determine it''s content type is not easy. It relies on the file signature knowledge base, described here: http://www.garykessler.net/library/file_sigs.html[^]
There is a FindMimeFromData() function in the urlmon.dll, but that is unmanaged code, thus you need PInvoke, see: http://www.dotnet247.com/247reference/msgs/26/133278.aspx[^]. It has it''s limitations, it can detect only 26 mime types. In linux there is an implementation called "magic numbers[^]".
This might be also interesting for you: A small Content Detection Library[^]
您可以检测它是html还是plian文本-没错.
但是，电子邮件最初不支持HTML和纯文本格式.
因此，您可以做的是将每条纯文本消息都视为富文本格式.这样，可以正确处理Richtext，也可以正确表示纯文本.
现在到XML:
那个有点难以发现. XML的格式如何?是在正文中吗?在这种情况下，您应该能够在文本的第一行中找到.
不能将其添加为附件吗?您使用起来会更轻松，更安全.
You can detect whether it is html or plian text - that''s right.
But Email does originally not support more foramts than HTML and plaintext.
SO what you can do is to treat each plaintext message like it''s a richtext. That way, richtext is processed correctly and plaintext is also represented correctly.
Now to the XML:
That one is a bit hard to detect. How well formatted is your XML? is it in the bodytext? IN that case you should be able to find ain the first row of text.
Can''t it be added as an attachment? Would be easier and safer for you to work with.
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