当我尝试使用 Add-Migration
时出现此错误:
The entity type 'Configuration' requires a primary key to be defined.
现在,我知道实体需要键,它有一个,但到目前为止,用 [Key]
简单地装饰一个属性就完成了这项工作,但它似乎不再是这样了.所以我有以下实体:
public class Configuration
{
[Key, ForeignKey("Client")]
public int ClientId { get; set; }
public CommunicationType CommunicationType { get; set; }
public string CommunicationValue { get; set; }
public virtual Client Client { get; set; }
}
但搜索了一段时间后,我发现显然 EF7 不喜欢它的约定被破坏,我需要将 ClientId
重命名为 ConfigurationId
,但是这对我的编码惯例来说似乎是错误的。我必须改变我的方式还是有办法绕过这个?提前致谢。
编辑
这是 Client
实体,是的,那里有一个 Configuration
属性
public class Client
{
[Key]
public int ClientId { get; set; }
public string Name { get; set; }
public virtual User User { get; set; }
public virtual List<Station> Stations { get; set; }
public Configuration Configuration { get; set; }
}
编辑
完整错误日志:
System.InvalidOperationException: The entity type 'Configuration' requires a primary key to be defined. in Microsoft.EntityFrameworkCore.Internal.ModelValidator.ShowError(String message) in Microsoft.EntityFrameworkCore.Internal.ModelValidator.EnsureNonNullPrimaryKeys(IModel model) in Microsoft.EntityFrameworkCore.Internal.ModelValidator.Validate(IModel model) in Microsoft.EntityFrameworkCore.Internal.RelationalModelValidator.Validate(IModel model) in Microsoft.EntityFrameworkCore.Infrastructure.ModelSource.CreateModel(DbContext context, IConventionSetBuilder conventionSetBuilder, IModelValidator validator) in Microsoft.EntityFrameworkCore.Infrastructure.ModelSource.c__DisplayClass14_0.b__0(Object k) in System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory) in Microsoft.EntityFrameworkCore.Infrastructure.ModelSource.GetModel(DbContext context, IConventionSetBuilder conventionSetBuilder, IModelValidator validator) in Microsoft.EntityFrameworkCore.Internal.DbContextServices.CreateModel() in Microsoft.EntityFrameworkCore.Internal.LazyRef`1.get_Value() in Microsoft.EntityFrameworkCore.Internal.DbContextServices.get_Model() in Microsoft.EntityFrameworkCore.Infrastructure.EntityFrameworkServiceCollectionExtensions.c.b__0_6(IServiceProvider p) in Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitFactoryService(FactoryService factoryService, ServiceProvider provider) in Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(IServiceCallSite callSite, TArgument argument) in Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScoped(ScopedCallSite scopedCallSite, ServiceProvider provider) in Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(IServiceCallSite callSite, TArgument argument) in Microsoft.Extensions.DependencyInjection.ServiceProvider.c__DisplayClass16_0.b__0(ServiceProvider provider) in Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService(Type serviceType) in Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetService[T](IServiceProvider provider) in Microsoft.EntityFrameworkCore.Design.Internal.DesignTimeServicesBuilder.c__DisplayClass6_0.b__9(IServiceProvider _) in Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitFactoryService(FactoryService factoryService, ServiceProvider provider) in Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(IServiceCallSite callSite, TArgument argument) in Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitTransient(TransientCallSite transientCallSite, ServiceProvider provider) in Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(IServiceCallSite callSite, TArgument argument) in Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor(ConstructorCallSite constructorCallSite, ServiceProvider provider) in Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(IServiceCallSite callSite, TArgument argument) in Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitTransient(TransientCallSite transientCallSite, ServiceProvider provider) in Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(IServiceCallSite callSite, TArgument argument) in Microsoft.Extensions.DependencyInjection.ServiceProvider.c__DisplayClass16_0.b__0(ServiceProvider provider) in Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService(Type serviceType) in Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider provider, Type serviceType) in Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService[T](IServiceProvider provider) in Microsoft.EntityFrameworkCore.Design.Internal.MigrationsOperations.AddMigration(String name, String outputDir, String contextType) in Microsoft.EntityFrameworkCore.Design.OperationExecutor.AddMigrationImpl(String name, String outputDir, String contextType) in Microsoft.EntityFrameworkCore.Design.OperationExecutor.AddMigration.c__DisplayClass0_1.b__0() in Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.c__DisplayClass3_0`1.b__0() in Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action) The entity type 'Configuration' requires a primary key to be defined.
最佳答案
您是否尝试过将 ForeignKey 属性移至导航属性?
public class Configuration
{
[Key]
public int ClientId { get; set; }
public CommunicationType CommunicationType { get; set; }
public string CommunicationValue { get; set; }
[ForeignKey("ClientId")]
public virtual Client Client { get; set; }
}
关于c# - 实体类型 'Configuration' 需要定义主键,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/41964707/