EF核心添加迁移失败，System.TypeLoadException

我想使用EF核心2.0来建立一个SQLite数据库，（一个简单的）。当我尝试在下面的代码上执行添加迁移时，它将失败，代码如下。EF核心添加迁移失败，System.TypeLoadException

public class RothSensor 
{ 
    public int Id { get; set; } 

    public string Location { get; set; } 

    public double CurrentTemp { get; set; } 

    public double TargetTemp { get; set; } 

    public enum _mode 
    { 
     Normal = 0, 
     Night = 1, 
     Holliday = 2 
    } 

    public _mode Mode { get; set; } 

    public double MinimumTemp { get; set; } 

    public double MaximumTemp { get; set; } 

    public int UnitId { get; set; } 

    public RothUnit Unit { get; set; } 

} 

public class RothUnit 
{ 

    public int Id { get; set; } 

    public string Name { get; set; } 

    public List<RothSensor> Sensors { get; set; } 


} 

public class HADataContext : DbContext 
{ 
    public DbSet<RothUnit> RUnits { get; set; } 
    public DbSet<RothSensor> RSensors { get; set; } 

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder) 
    { 
     optionsBuilder.UseSqlite("Data Source = HomeAutomation.db"); 
    } 
}

错误代码是： -

PM>添加-迁移HomeAutomationDB
System.TypeLoadException：无法从组件加载类型 'System.Globalization.CultureInfo'“System.Runtime，版= 4.0.0.0，Culture = neutral，PublicKeyToken = b03f5f7f11d50a3a'。在System.Collections.Immutable.ImmutableSortedDictionary 2.Node.SetOrAdd(TKey key, TValue value, IComparer 1 keyComparer，的IEqualityComparer 1 valueComparer, Boolean overwriteExistingValue, Boolean& replacedExistingValue, Boolean& mutated) at System.Collections.Immutable.ImmutableSortedDictionary 2.Node.SetItem（TKEY的键，TValue值，的IComparer 1 keyComparer, IEqualityComparer 1 valueComparer，布尔& replacedExistingValue，布尔&突变的）在System.Collections.Immutable.ImmutableSortedDictionary 2.Builder.set_Item(TKey key, TValue value) at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.RelationshipDiscoveryConvention.GetNavigationCandidates(EntityType entityType) at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.RelationshipDiscoveryConvention.FindRelationshipCandidates(InternalEntityTypeBuilder entityTypeBuilder) at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.RelationshipDiscoveryConvention.DiscoverRelationships(InternalEntityTypeBuilder entityTypeBuilder) at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.RelationshipDiscoveryConvention.Apply(InternalEntityTypeBuilder entityTypeBuilder) at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.ConventionDispatcher.ImmediateConventionScope.OnEntityTypeAdded(InternalEntityTypeBuilder entityTypeBuilder) at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.ConventionDispatcher.OnEntityTypeAdded(InternalEntityTypeBuilder entityTypeBuilder) at Microsoft.EntityFrameworkCore.Metadata.Internal.Model.AddEntityType(EntityType entityType) at Microsoft.EntityFrameworkCore.Metadata.Internal.Model.AddEntityType(Type type, ConfigurationSource configurationSource) at Microsoft.EntityFrameworkCore.Metadata.Internal.InternalModelBuilder.Entity(TypeIdentity type, ConfigurationSource configurationSource) at Microsoft.EntityFrameworkCore.Metadata.Internal.InternalModelBuilder.Entity(Type type, ConfigurationSource configurationSource) at Microsoft.EntityFrameworkCore.ModelBuilder.Entity(Type type) at Microsoft.EntityFrameworkCore.Infrastructure.ModelCustomizer.FindSets(ModelBuilder modelBuilder, DbContext context) at Microsoft.EntityFrameworkCore.Infrastructure.RelationalModelCustomizer.FindSets(ModelBuilder modelBuilder, DbContext context) at Microsoft.EntityFrameworkCore.Infrastructure.RelationalModelCustomizer.Customize(ModelBuilder modelBuilder, DbContext context) at Microsoft.EntityFrameworkCore.Infrastructure.ModelSource.CreateModel(DbContext context, IConventionSetBuilder conventionSetBuilder, IModelValidator validator) at Microsoft.EntityFrameworkCore.Infrastructure.ModelSource.<>c__DisplayClass5_0.<GetModel>b__0(Object k) at System.Collections.Concurrent.ConcurrentDictionary 2.GetOrAdd（TKEY的密钥，函数功能2 valueFactory) at Microsoft.EntityFrameworkCore.Infrastructure.ModelSource.GetModel(DbContext context, IConventionSetBuilder conventionSetBuilder, IModelValidator validator) at Microsoft.EntityFrameworkCore.Internal.DbContextServices.CreateModel() at Microsoft.EntityFrameworkCore.Internal.DbContextServices.get_Model() at Microsoft.EntityFrameworkCore.Infrastructure.EntityFrameworkServicesBuilder.<>c.<TryAddCoreServices>b__7_1(IServiceProvider p) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitFactory(FactoryCallSite factoryCallSite, ServiceProvider provider) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor 2.VisitCallSite（IServiceCallSite调用点，TArgument参数）在Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScoped（ScopedCallSite scopedCallSite，的ServiceProvider提供商）在Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor 2.VisitCallSite(IServiceCallSite callSite, TArgument argument) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor(ConstructorCallSite constructorCallSite, ServiceProvider provider) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor 2.VisitCallSite（IServiceCallSite callSite，TArgument参数）在Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScoped（ScopedCallSite scopedCallSite，的ServiceProvider提供商）在Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor 2.VisitCallSite(IServiceCallSite callSite, TArgument argument) at Microsoft.Extensions.DependencyInjection.ServiceProvider.<>c__DisplayClass22_0.<RealizeService>b__0(ServiceProvider provider) at Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService(Type serviceType) at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider provider, Type serviceType) at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService[T](IServiceProvider provider) at Microsoft.EntityFrameworkCore.DbContext.get_DbContextDependencies() at Microsoft.EntityFrameworkCore.DbContext.get_InternalServiceProvider() at Microsoft.EntityFrameworkCore.DbContext.Microsoft.EntityFrameworkCore.Infrastructure.IInfrastructure<System.IServiceProvider>.get_Instance() at Microsoft.EntityFrameworkCore.Infrastructure.AccessorExtensions.GetService[TService](IInfrastructure 1个存取）在Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.CreateContext （函数功能1 factory) at Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.CreateContext(String contextType) at Microsoft.EntityFrameworkCore.Design.Internal.MigrationsOperations.AddMigration(String name, String outputDir, String contextType) at Microsoft.EntityFrameworkCore.Design.OperationExecutor.AddMigrationImpl(String name, String outputDir, String contextType) at Microsoft.EntityFrameworkCore.Design.OperationExecutor.AddMigration.<>c__DisplayClass0_1.<.ctor>b__0() at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.<>c__DisplayClass3_0 1.b__0（）在Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute（动作动作）无法从组件加载类型 'System.Globalization.CultureInfo'“System.Runtime，版本= 4.0.0.0，文化=中立，PublicKeyToken = b03f5f7f11d50a3a'。
PM>

我曾尝试一切可能的提示我可以在网上找到，但它仍然失败。它可以通过的唯一方法是如果我从RothUnit模型中删除列表并删除RothSensor类中的最后一行。

我不知道这是EF核心还是我的代码。任何人都可以引导我在正确的方向。

来源

2017-10-17 DreamNet

你是否定义了Rothsensor和Rothunit之间的关系？ –

是的，我甚至试图明确定义关系，而不是让EF发现它，这是它失败的地方。但我不知道它为什么失败！ – DreamNet

您是否为modelbuilder中的实体定义了任何主键或外键？ –

经过大量的挖掘并向EntityFrameworkCore GitHub页面提交问题。看起来这是EF Core 2.0本身的一个问题。他们意识到这一点，并已在未来的版本中解决。

有一种莫名其妙变通方法，您可以通过以下链接找到它： - GitHub EF Core

解决办法是在EF核心团队的礼貌。

来源

2017-11-06 12:29:17 DreamNet

EF核心添加迁移失败，System.TypeLoadException

回答

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