New Post: Assembly version as ExportMetadata

For all exports, or just a selection?

The former, I'm not sure about. There are a couple of days to achieve the
latter.

If you're using conventions, you can do this in an Export(x => ...)
statement using AddMetadata().

If you're using attributes only, a custom MetadataAttribute can do this.

Let us know which approach you're using and with what version of MEF.

Cheers,
Nick