有是rel=\"nofollow\">报告的bug 这会导致这个问题的时候EDMX是不是在项目目录的根目录。当您将EDMX成子文件夹，您必须手动运行自定义工具来重新生成类。

There is reported bug which causes this issue when EDMX is not in the root of project directory. When you place EDMX into sub folder you must manually run custom tool to regenerate classes.