an exception occurred while initializing the database.
对于手动删除本地的LocalDB数据库之后出现标题所示异常的，推荐下面的命令：
sqllocaldb.exe stop v11.0
sqllocaldb.exe delete v11.0
在程序包管理器控制台或者Visual Studio自带的命令行工具执行都可以。
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