Question

我试图使用EF core 2.0来构建一个SQLite数据库（一个简单的数据库）。当我尝试在以下代码上执行Add-Migration时，它会失败并显示以下代码。

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＆GT;添加迁移HomeAutomationDB
  System.TypeLoadException：无法加载类型＆＃39; System.Globalization.CultureInfo＆＃39;来自assembly＆System; Run.Runtime，Version = 4.0.0.0，Culture = neutral，PublicKeyToken = b03f5f7f11d50a3a＆＃39;。      at System.Collections.Immutable.ImmutableSortedDictionary 2.Node.SetOrAdd(TKey key, TValue value, IComparer 1 keyComparer，IEqualityComparer 1 valueComparer, Boolean overwriteExistingValue, Boolean& replacedExistingValue, Boolean& mutated) at System.Collections.Immutable.ImmutableSortedDictionary 2.Node.SetItem（TKey key，TValue value，IComparer 1 keyComparer, IEqualityComparer 1 valueComparer，Boolean＆amp; replacementExistingValue，Boolean＆amp; mutated ）      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 key，Func 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 callSite，TArgument参数）      在Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScoped（ScopedCallSite scopedCallSite，ServiceProvider provider）      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，ServiceProvider provider）      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访问者）      在Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.CreateContext（Func 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（Action action）   无法加载类型＆＃39; System.Globalization.CultureInfo＆＃39;来自assembly＆System; Run.Runtime，Version = 4.0.0.0，Culture = neutral，PublicKeyToken = b03f5f7f11d50a3a＆＃39;。
  PM＆GT;

我已经尝试过我可以在网上找到的所有可能的提示，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List并删除RothSensor类中的最后一行。

我不知道它是EF核心还是我的代码。任何人都可以指导我朝着正确的方向前进。

Answer 1

经过大量挖掘并向EntityFrameworkCore GitHub页面提交问题。看起来这是EF Core 2.0本身的一个问题。他们意识到了这一点，并在未来的版本中得到了解决。

您可以通过以下链接找到某种解决方法： - GitHub EF Core

解决方法是EF核心团队的礼貌。

EF Core Add-Migration因System.TypeLoadException而失败

1 个答案: