Is there an enum for the ContentType property on a

问题:

The closest thing I could find was System.Net.Mime.MediaTypeNames but that doesn't seem to have everything (like json) since it seems to be more focused around email attachments.

回答1:

An enum doesn't make much sense. MIME types are open-ended. That is, the list is not finite: new types are added from time to time.

See RFC4288: Media Type Specifications and Registration Procedures

回答2:

IANA's database is most likely to be complete, but you would need to parse those pages to get a flat list.

There is also the mime.types file that comes with Apache which seems to have been derived from the said list.