EF Code First（提示The model backing the '***' context has changed since the database was created.）
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错误消息：
The model backing the '***' context has changed since the database was created. Consider using Code First Migrations to update the database (http://go.microsoft.com/fwlink/?LinkId=238269).
错误原因：
（1）数据模型发生改变，而没有更新到数据库导致此问题。
事实上我遇到的情况不是原因（1），而是（2）造成的
（2）更新到数据库 用的EF 6.1.0 ，而数据访问层用的是EF 6.0.2
解决方法：
（1）用Code First 更新数据库，命令如下：
Add-Migration
Update-Database -Verbose
（2）数据访问层换成EF 6.1.0 ，问题解决
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