我有一个使用Database First的Entity Framework 6.1.3应用程序。 应用程序正常运行，我从数据库中获取了我想要的数据。
问题是当我打开（双击）MainWindow.xaml时出现此错误：
UnintentionalCodeFirstException: The context is being used in Code First
mode with code that was generated from an EDMX file for either Database
First or Model First development. This will not work correctly. To fix
this problem do not remove the line of code that throws this exception.
If you wish to use Database First or Model First, then make sure that
the Entity Framework connection string is included in the app.config or
web.config of the start-up project. If you are creating your own
DbConnection, then make sure that it is an EntityConnection and not some
other type of DbConnection, and that you pass it to one of the base
DbContext constructors that take a DbConnection. To learn more about
Code First, Database First, and Model First see the Entity Framework
documentation here: http://go.microsoft.com/fwlink/?LinkId=394715
所以EF正在调用 OnModelCreating（..） 它不应该！
来自app.config的连接字符串：
<connectionStrings>
<add name="AuthorBookEntities" connectionString="metadata=res://*/AuthorBook.csdl|res://*/AuthorBook.ssdl|res://*/AuthorBook.msl;provider=System.Data.SqlClient;provider connection string="data source=LENOVO-PC;initial catalog=BOOKS;integrated security=True;MultipleActiveResultSets=True;App=EntityFramework"" providerName="System.Data.EntityClient" />
</connectionStrings>
所有EF代码都是由T4脚本创建的。 该应用程序是一个WPF程序，没有dll或任何东西......
可能出现什么问题？