Question

尝试将现有项目从beta 8更改为RC1后，我在运行dnx ef migrations add Init

后得到以下内容

System.TypeLoadException: Could not load type 'Microsoft.Data.Entity.Scaffolding.SqliteDesignTimeServices, EntityFramework.Sqlite.Design'.
  at Microsoft.Data.Entity.Design.Internal.DesignTimeServicesBuilder.ConfigureProviderServices (System.String provider, IServiceCollection services, Boolean throwOnError) [0x00000] in <filename unknown>:0 
  at Microsoft.Data.Entity.Design.Internal.DesignTimeServicesBuilder.Build (Microsoft.Data.Entity.DbContext context) [0x00000] in <filename unknown>:0 
  at Microsoft.Data.Entity.Design.MigrationsOperations.AddMigration (System.String name, System.String outputDir, System.String contextType) [0x00000] in <filename unknown>:0 
  at Microsoft.Data.Entity.Commands.Program+Executor+<>c__DisplayClass6_0.<AddMigration>b__0 () [0x00000] in <filename unknown>:0 
  at Microsoft.Data.Entity.Commands.Program+Executor.Execute (System.Action action) [0x00000] in <filename unknown>:0 
Could not load type 'Microsoft.Data.Entity.Scaffolding.SqliteDesignTimeServices, EntityFramework.Sqlite.Design'.

我的project.json文件包含以下其他文件

"dependencies": {
  "EntityFramework.Commands": "7.0.0-rc1-final",
  "EntityFramework.SQLite": "7.0.0-rc1-final"
},
"commands": {
  "ef": "EntityFramework.Commands"
},

我需要做些什么才能解决此错误？

Answer 1

由于区分大小写的文件系统，软件包名称在Linux和OS X上区分大小写。请务必在 project.json 文件中使用EntityFramework.Sqlite而不是EntityFramework.SQLite。（参见GitHub问题dotnet/cli#236）

Answer 2

首先解析您的引用/依赖项。必须解决所有参考警告，并且必须为“7.0.0-rc1-final”。

如果没有“7.0.0-rc1-final”版本，则可能会将某些内容重命名为其他名称。请参阅annoncement repro了解更改

"dependencies": {
  "EntityFramework.Commands": "7.0.0-rc1-final",
  "EntityFramework.SQLite": "7.0.0-rc1-final"
},

EF 7 Beta 8 - ＆gt; EF7 RC1 - 不再可以创建迁移

2 个答案: