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打开GuGet命令框，输入如下命令就可以了
PM> sqllocaldb.exe stop v11.0 LocalDB instance "v11.0" stopped. PM> PM> sqllocaldb.exe delete v11.0 LocalDB instance "v11.0" deleted. PM> sqllocaldb.exe start v11.0 LocalDB instance "v11.0" started.
Cannot attach the file 'E:\TeamWork\Fido\Fido.WebSite\App_Data\FidoData.mdf' as database 'FidoData'.
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原文地址：http://www.cnblogs.com/ifengqi/p/5205378.html
