Cannot attach the file as database
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Cannot attach the file as database这个异常是在EF的code frist里经常出现的，解决方法很简单，只要重新启动一下V11实例即可。
CMD> sqllocaldb.exe stop v11.0
LocalDB instance "v11.0" stopped.
CMD>
CMD> sqllocaldb.exe delete v11.0
LocalDB instance "v11.0" deleted.
CMD> sqllocaldb.exe start v11.0
LocalDB instance "v11.0" started.以上是关于Cannot attach the file as database的主要内容，如果未能解决你的问题，请参考以下文章
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