MSDN官方资料,并且微软还提供了SimpleCalculator sample学习样例
http://msdn.microsoft.com/en-us/library/dd460648(v=vs.110).aspx
博友文章
http://www.cnblogs.com/Mainz/archive/2011/04/27/2030701.html
Ten Reasons to use the Managed Extensibility Framework
Reason One: It's out of the box.
Reason Two: Dependency injection and inversion of control.
Reason Three: Lifetime management.
Reason Four: Configuration.
Reason Five: Factories with dependency resolution.
Reason Six: ImportMany.
Reason Seven: Strongly typed Metadata.
Reason Eight: Extensibility.
Reason Nine: Modularity.
Reason Ten: Customization.