When is MEF shipping?

I'm building a product that will ship after .Net 4.0 i开发者_如何学JAVAs released.

Is MEF an integral part of .Net 4.0, so I can count on them being released together, or is it some external component that might be released separately and thus it is dangerous to use?

Yes, MEF is the part of .NET Framework 4.0. It is located in assembly System.ComponentModel.Composition.dll. You can learn more here: MEF in MSDN

The Managed Extensibility Framework (MEF) is a new library in .NET Framework 4.0 that addresses this problem by simplifying the design of extensible applications and components.