c# asp.net4.0尚未在web服务器上注册

辗转无数论坛，感谢http://bbs.csdn.net/topics/390992746

microsoft官方文档：

https://blogs.msdn.microsoft.com/webdev/2014/11/11/dialog-box-may-be-displayed-to-users-when-opening-projects-in-microsoft-visual-studio-after-installation-of-microsoft-net-framework-4-6/

下载安装VS11-KB3002339.exe补丁成功解决。