问题
I have a visual studio 2012 project. All of the paths are set correctly, and I can compile the project without any problem.
While using the Visual Studio IDE, I click on a function or class defined in a header, which is not in the root of source directory, and the IDE can not find it. When I select a header file and ask the IDE to open it, the IDE says that it can not find it.
What is the problem and how can I fix it?
I tried to reset IntelliSense cache, but there is no refresh menu on edit -> IntelliSense.#
来源：https://stackoverflow.com/questions/27823228/why-visual-studio-editor-can-not-find-a-header-file-when-compiler-can-find-it