Question

我有两个上下文和一个数据库。

当我尝试添加数据库迁移（add-migrations）时，我收到此错误。

我已将EF更新为6.2。

我检查过，configure.cs文件正在使用

internal sealed class Configuration : DbMigrationsConfiguration<MSiH.CigaretteContext>

PM＆GT; add-migration -configuration MSiH.DataAccess.CigaretteContext -Verbose cmdlet在命令管道位置1处添加迁移提供以下参数的值：名称：初始使用StartUp项目'GridAndMap'。使用NuGet项目'GridAndMap'。

System.Data.Entity.Migrations.Infrastructure.MigrationsException: The type
 'MSiH.CigaretteContext' does not inherit from 
'System.Data.Entity.Migrations.DbMigrationsConfiguration'. 
Migrations configuration types must extend from
'System.Data.Entity.Migrations.DbMigrationsConfiguration'.
at System.Data.Entity.Utilities.TypeExtensions.CreateInstance[T]
(Type type, Func`3 typeMessageFactory, Func`2 exceptionFactory)
at System.Data.Entity.Migrations.Utilities.MigrationsConfigurationFinder.FindMigrationsConfiguration
(Type contextType, String configurationTypeName, 
Func`2 noType, Func`3 multipleTypes, Func`3 noTypeWithName, Func`3 multipleTypesWithName)
 at System.Data.Entity.Migrations.Design.ToolingFacade.BaseRunner.FindConfiguration()
 at System.Data.Entity.Migrations.Design.ToolingFacade.ScaffoldRunner.Run()
 at System.AppDomain.DoCallBack(CrossAppDomainDelegate callBackDelegate)
 at System.AppDomain.DoCallBack(CrossAppDomainDelegate callBackDelegate)
 at System.Data.Entity.Migrations.Design.ToolingFacade.Run(BaseRunner runner)
 at System.Data.Entity.Migrations.Design.ToolingFacade.Scaffold(String migrationName,    String language, String rootNamespace, Boolean ignoreChanges)
 at System.Data.Entity.Migrations.AddMigrationCommand.Execute(String name, Boolean force, Boolean ignoreChanges)
 at System.Data.Entity.Migrations.AddMigrationCommand.<>c__DisplayClass2.<.ctor>b__0()
 at System.Data.Entity.Migrations.MigrationsDomainCommand.Execute(Action command)
 The type 'MSiH.EyePaid.CigaretteWebApp.DataAccess.CigaretteContext' does not inherit  
 from 'System.Data.Entity.Migrations.DbMigrationsConfiguration'. Migrations 
 configuration types must extend from
'System.Data.Entity.Migrations.DbMigrationsConfiguration'.

更新

关于如何在多个上下文中使用EF Migration，我正在关注example。

Enable-Migrations -ContextTypeName Foo.CigaretteContext

此命令出错：

Add-Migration -configuration Foo.CigaretteContext Initial

此命令有效：

Add-Migration Initial

Answer 1

Configuration或ConfigurationTypeName参数是指从DbMigrationsConfiguration派生的类。

您所做的是指从DbContext派生的类。

你应该这样做。

Add-Migration -Configuration MSiH.MigrationDatabaseIfAny.Configuration Initial

PS：MigrationDatabaseIfAny是目录名称如果您的Configuration类位于目录下，如果不是只删除它。

类型＆＃39;上下文＆＃39;不会继承自System.Data.Entity.Migrations.DbMigrationsConfiguration＆＃39;。与EF迁移

1 个答案: