答案是：曾经是，但现在不是了。这个问题困扰了我一段时间，因为时不时会在非MFC的项目中看到别人使用CString；只是这类技术细节也不是什么大不了的事，以往并没有深究。今天突然来了点兴致，在MSDN上查到这样一段话：

 

Beginning with Visual C++ .NET 2002, several existing MFC utility classes were rewritten or revised to reduce their dependencies on other MFC classes. These utility classes can now be used in any native C++ project. This section only includes classes that were previously available to MFC projects and have now been shared, plus a few new classes related to the changes in CString. It does not include the ATL classes, which can be used in any native C++ project type by inclusion of the appropriate header.

 

 

Classes Shared Between MFC and ATL: