可添加对象必须具有添加迁移值abp v 3.0.0

当我在ef代码中添加迁移时遇到错误“可为空的对象必须具有值”，但我无法在代码中找到错误位置，或者可能是错误abp框架。如何在Package Manager Console中执行命令时发现错误的位置。但是当我从DbContext中删除所有我的自定义实体并删除映射文件时，不会显示此错误。可添加对象必须具有添加迁移值abp v 3.0.0

堆栈跟踪：

PM> add-migration Init_Db 
Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager[0] 
     User profile is available. Using 'C:\Users\Adam\AppData\Local\ASP.NET\DataProtection-Keys' as key repository and Windows DPAPI to encrypt keys at rest. 
An error occurred while calling method 'BuildWebHost' on class 'Program'. Continuing without the application service provider. Error: Nullable object must have a value. 
System.InvalidOperationException: Nullable object must have a value. 
    at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource) 
    at System.Nullable`1.get_Value() 
    at Microsoft.EntityFrameworkCore.Metadata.Internal.InternalEntityTypeBuilder.DetachRelationship(ForeignKey foreignKey) 
    at Microsoft.EntityFrameworkCore.Metadata.Internal.InternalEntityTypeBuilder.HasBaseType(EntityType baseEntityType, ConfigurationSource configurationSource) 
    at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.DerivedTypeDiscoveryConvention.Apply(InternalEntityTypeBuilder entityTypeBuilder) 
    at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.ConventionDispatcher.ImmediateConventionScope.OnEntityTypeAdded(InternalEntityTypeBuilder entityTypeBuilder) 
    at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.ConventionDispatcher.RunVisitor.VisitOnEntityTypeAdded(OnEntityTypeAddedNode node) 
    at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.ConventionDispatcher.OnEntityTypeAddedNode.Accept(ConventionVisitor visitor) 
    at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.ConventionDispatcher.ConventionVisitor.Visit(ConventionNode node) 
    at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.ConventionDispatcher.ConventionVisitor.VisitConventionScope(ConventionScope node) 
    at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.ConventionDispatcher.ConventionScope.Accept(ConventionVisitor visitor) 
    at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.ConventionDispatcher.ConventionVisitor.Visit(ConventionNode node) 
    at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.ConventionDispatcher.ConventionVisitor.VisitConventionScope(ConventionScope node) 
    at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.ConventionDispatcher.ConventionBatch.Run() 
    at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.ConventionDispatcher.ConventionBatch.Dispose() 
    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.ModelCustomizer.Customize(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 argument) 
    at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScoped(ScopedCallSite scopedCallSite, ServiceProvider provider) 
    at 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 argument) 
    at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScoped(ScopedCallSite scopedCallSite, ServiceProvider provider) 
    at 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 accessor) 
    at 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.<Execute>b__0() 
    at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action) 
Nullable object must have a value.

来源

2017-09-23 rahim

您的任何自定义实体是否具有自引用关系？否则，您是否可以逐个删除自定义实体以缩小原因并显示它？ – aaron

当我为实体写映射时，我解决了映射错误与您的解决方案，但它非常困难和耗时。但你给了我一个很好的提示“自我参照关系”。 – rahim

我还没有确认。 – rahim

后第2天，我发现错误

的原因错误是注释的代码

public abstract class EntityMapConfiguration<T> : DbEntityConfiguration<T> where T : class 
{ 
    public override void Configure(EntityTypeBuilder<T> entity) 
    { 
     //if (typeof(ICreationAudited<ApplicationUser>).GetTypeInfo().IsAssignableFrom(typeof(T))) 
     //{ 
     // entity.HasOne(nameof(ICreationAudited<ApplicationUser>.CreatorUser)) 
     //  .WithOne() 
     //  .HasForeignKey(typeof(T), "CreatorUserId"); 
     //} 
     //if (typeof(IModificationAudited<ApplicationUser>).GetTypeInfo().IsAssignableFrom(typeof(T))) 
     //{ 
     // entity.HasOne(nameof(IModificationAudited<ApplicationUser>.LastModifierUser)) 
     //  .WithOne() 
     //  .HasForeignKey(typeof(T), "LastModifierUserId"); 
     //} 

     if (typeof(IHasConcurrency).GetTypeInfo().IsAssignableFrom(typeof(T))) 
      entity.Property(nameof(IHasConcurrency.RowVersion)).IsRowVersion(); 
    } 
}

终于解决映射错误用下面的代码，但我无法理解映射在Ef核心1中没有任何问题的原因，而在Ef Core 2中有错误

entity.HasOne(x => x.Bank).WithOne().HasForeignKey<BankAccount>(x => x.BankId);

来源

2017-09-27 07:15:43 rahim

可添加对象必须具有添加迁移值abp v 3.0.0

回答

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