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ps: http://waf.codeplex.com/releases/view/618696
This page might help you to understand what MEF does in the sample applications.
帮助理解 MEF
MEF(Managed Extensibility Framework)是一个用于创建可扩展的轻型应用程序的库。
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原文地址：http://www.cnblogs.com/ganmk--jy/p/5539067.html
