sqlite - 添加迁移命令在 UWP 应用程序的 EF 7 中不起作用

Question

我正在关注 getting started with EF 7 for UWP apps官方教程。

当我在添加迁移 MyFirstMigration 时，它抛出以下错误:

PM> Add-Migration MyFirstMigration

Add-Migration : Exception calling "CreateInstanceAndUnwrap" with "8" argument(s): "Could not load file or assembly 'AppShellProject, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' 
or one of its dependencies. An attempt was made to load a program with an incorrect format."
At line:1 char:1
+ Add-Migration MyFirstMigration
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Add-Migration], MethodInvocationException
    + FullyQualifiedErrorId : BadImageFormatException,Add-Migration

有没有人想出任何解决方法？

Answer 1

干得好@Anil。 :)

其实，因为这种问题可能与Visual Studio工具或NuGet有关。通过在 GitHub 上的 EF 存储库中搜索“CreateInstanceAndUnwrap Add-Migration”，您将看到一些 issues那里。如果您下次找不到任何现有问题，就像我问的问题(project.json，项目类型等)一样，请尝试找出您的步骤/配置之间的区别是什么，本教程将对您有所帮助，您将了解更多信息以获得快速答复。

我相信@bricelam 已经指出了您遇到的问题，没有人比他更熟悉 EF7。我想从那一期的@bricelam 中挑选一些关键信息作为结尾:

Correct, the Migration commands won't work with x64 assemblies. The current implementation executes inside of an AppDomain created from VS (devenv.exe) which is a 32-bit process.

you'll have to use x86 at design-time.