xxxxxx.xxxxx.xxxx:
System.TypeLoadException : Could not load type 'MultiInterface1' from assembly 'Mocks, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' because it attempts to implement a class as an interface.
具体原因：NMock2 only support mocking interface but not class. If you try to mock class, you will get an error message: System.TypeLoadException: Could not load type 'MultiInterface1' from assembly ......
翻译过来就是：要用NMock2，被Mock的东东就必须是Interface，而不能直接是Class
