转一篇mef的。。。。

Building Hello MEF – Part II – Metadata and why being Lazy is a good thing.

http://blogs.msdn.com/b/gblock/archive/2009/12/05/building-hello-mef-part-ii-metadata-and-why-being-lazy-is-a-good-thing.aspx

Building Hello MEF – Part III – XAP Partitioning (with the host’s permission) and the sweetness of recomposition.

http://blogs.msdn.com/b/gblock/archive/2009/12/15/building-hello-mef-part-iii-xap-partitioning-with-the-host-s-permission-and-the-sweetness-of-recomposition.aspx