由于模型 InverseProperty，Asp.net core 2.1 崩溃 [英] Asp.net core 2.1 crashing due to model InverseProperty

问题描述

我的网站在加载时崩溃，System.Reflection 在第一次调用 DbContext 时出现了一个非常长的未处理异常.

My site is crashing on load with an extremely long unhandled exception in System.Reflection on the first call to the DbContext.

使用 ef-core 2.1 rc1

Using ef-core 2.1 rc1

System.ArgumentNullException: Value cannot be null.
Parameter name: type
   at System.Reflection.IntrospectionExtensions.GetTypeInfo(Type type)
   at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.InversePropertyAttributeConvention.ConfigureInverseNavigation(InternalEntityTypeBuilder entityTypeBuilder, MemberInfo navigationMemberInfo, InternalEntityTypeBuilder targetEntityTypeBuilder, InversePropertyAttribute attribute)
   at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.InversePropertyAttributeConvention.Apply(InternalEntityTypeBuilder entityTypeBuilder, PropertyInfo navigationPropertyInfo, Type targetClrType, InversePropertyAttribute attribute)
   at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.NavigationAttributeEntityTypeConvention`1.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.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, Boolean throwOnQuery)
   at Microsoft.EntityFrameworkCore.Metadata.Internal.InternalModelBuilder.Entity(Type type, ConfigurationSource configurationSource, Boolean throwOnQuery)
   at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.InversePropertyAttributeConvention.Apply(InternalEntityTypeBuilder entityTypeBuilder, PropertyInfo navigationPropertyInfo, Type targetClrType, InversePropertyAttribute attribute)
   at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.NavigationAttributeEntityTypeConvention`1.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, Boolean throwOnQuery)
   at Microsoft.EntityFrameworkCore.Metadata.Internal.InternalModelBuilder.Entity(Type type, ConfigurationSource configurationSource, Boolean throwOnQuery)
   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__1()
   at System.Lazy`1.ViaFactory(LazyThreadSafetyMode mode)
   at System.Lazy`1.ExecutionAndPublication(LazyHelper executionAndPublication, Boolean useDefaultConstructor)
   at System.Lazy`1.CreateValue()
   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, ServiceProviderEngineScope scope)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(IServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScoped(ScopedCallSite scopedCallSite, ServiceProviderEngineScope scope)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(IServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor(ConstructorCallSite constructorCallSite, ServiceProviderEngineScope scope)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(IServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScoped(ScopedCallSite scopedCallSite, ServiceProviderEngineScope scope)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(IServiceCallSite callSite, TArgument argument)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.DynamicServiceProviderEngine.<>c__DisplayClass1_0.<RealizeService>b__0(ServiceProviderEngineScope scope)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngine.GetService(Type serviceType, ServiceProviderEngineScope serviceProviderEngineScope)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope.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.get_DbContextDependencies()
   at Microsoft.EntityFrameworkCore.DbContext.get_Model()
   at Microsoft.EntityFrameworkCore.Internal.InternalDbSet`1.get_EntityType()
   at Microsoft.EntityFrameworkCore.Internal.InternalDbSet`1.get_EntityQueryable()
   at Microsoft.EntityFrameworkCore.Internal.InternalDbSet`1.System.Linq.IQueryable.get_Provider()
   at Microsoft.EntityFrameworkCore.EntityFrameworkQueryableExtensions.AsNoTracking[TEntity](IQueryable`1 source)
   at Ctrack.ReportGroups.Pages.IndexModel.OnGetAsync() in C:UserslukemDocumentsVisual Studio 2017ProjectsCtrack.ReportGroupsCtrack.ReportGroupsPagesIndex.cshtml.cs:line 34
   at Microsoft.AspNetCore.Mvc.RazorPages.Internal.ExecutorFactory.NonGenericTaskHandlerMethod.Execute(Object receiver, Object[] arguments)
   at Microsoft.AspNetCore.Mvc.RazorPages.Internal.PageActionInvoker.InvokeHandlerMethodAsync()
   at Microsoft.AspNetCore.Mvc.RazorPages.Internal.PageActionInvoker.InvokeNextPageFilterAsync()
   at Microsoft.AspNetCore.Mvc.RazorPages.Internal.PageActionInvoker.Rethrow(PageHandlerExecutedContext context)
   at Microsoft.AspNetCore.Mvc.RazorPages.Internal.PageActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.RazorPages.Internal.PageActionInvoker.InvokeInnerFilterAsync()
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextResourceFilter()
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResourceExecutedContext context)
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeFilterPipelineAsync()
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeAsync()
   at Microsoft.AspNetCore.Builder.RouterMiddleware.Invoke(HttpContext httpContext)
   at Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore.MigrationsEndPointMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore.DatabaseErrorPageMiddleware.Invoke(HttpContext httpContext)
   at Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore.DatabaseErrorPageMiddleware.Invoke(HttpContext httpContext)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

该问题可能与 Inverse Properties 的配置有关(基于第 2 条 at 语句)

The issue may be related to the configuration of Inverse Properties (based on the 2nd at statement)

群组

最后两个字段取反

[Table("Report_Group")]
public class Group
{
    [Key, Required, Column("GroupId")]
    public int Id { get; set; }

    [Required, MaxLength(5)]
    public string OrgCode  { get; set; }

    [Required, MaxLength(100)]
    public string Name { get; set; }

    public int TierId { get; set; }

    public int? ParentGroupId { get; set; }

    public int? CostCenter { get; set; }

    [Required]
    public int ExcludeFromAlertStats { get; set; }

    [Required]
    public int GroupTypeId { get; set; }

    [ForeignKey("ParentGroupId")]
    public virtual Group Parent { get; set; }

    [ForeignKey("OrgCode")]
    public virtual Organisation Organisation { get; set; }

    [ForeignKey("TierId")]
    public virtual Tier Tier { get; set; }

    [ForeignKey("GroupTypeId")]
    public virtual GroupType GroupType { get; set; }

    [InverseProperty("GroupId")]
    public virtual IList<GroupToUnitLink> UnitLinks { get; set; }

    [InverseProperty("GroupId")]
    public virtual IList<GroupToContactLink> ContactLinks { get; set; }
}

GroupToContactLink

多对多链接表.没有 InverseProperty.供参考

Many to Many link table. No InverseProperty's. Included for reference

[Table("Report_Link_Group_to_Contact")]
public class GroupToContactLink
{
    public GroupToContactLink()
    {
    }

    public GroupToContactLink(int contactId, int groupId, int linkTypeId)
    {
        this.ContactId = contactId;
        this.GroupId = groupId;
        this.LinkTypeId = linkTypeId;
    }

    [Required]
    public int ContactId { get; set; }

    [Required]
    public int GroupId { get; set; }

    [Required]
    public int LinkTypeId { get; set; }

    [ForeignKey("ContactId")]
    public virtual Contact Contact { get; set; }

    [ForeignKey("GroupId")]
    public virtual Group Group { get; set; }

    [ForeignKey("LinkTypeId")]
    public virtual ContactLinkType LinkType { get; set; }

}

GroupToUnitLink

多对多链接表.没有 InverseProperty.供参考

Many to Many link table. No InverseProperty's. Included for reference

[Table("Report_Link_Group_to_Unit")]
public class GroupToUnitLink
{
    [Required]
    public int NodeId { get; set; }

    [Required]
    public int GroupId { get; set; }

    public GroupToUnitLink()
    { }

    public GroupToUnitLink(int nodeId, int groupId)
    {
        this.NodeId = nodeId;
        this.GroupId = groupId;
    }

    [ForeignKey("NodeId")]
    public virtual Unit Unit { get; set; }

    [ForeignKey("GroupId")]
    public virtual Group Group { get; set; }

}

联系方式

也有一个逆属性

[Table("Report_Contact")]
public class Contact
{
    [Key, Column("ContactId")]
    public int Id { get; set; }

    [Required, StringLength(5)]
    public string OrgCode { get; set; }

    [Required, StringLength(100)]
    public string Name { get; set; }

    [StringLength(12)]
    public string Phone { get; set; }

    [StringLength(255), EmailAddress]
    public string Email { get; set; }

    [ForeignKey("OrgCode")]
    public virtual Organisation Organisation { get; set; }

    [InverseProperty("ContactId")]
    public virtual IList<GroupToContactLink> GroupLinks { get; set; }
}

这些反向属性配置正确吗?

Are these inverse properties configured correctly?

推荐答案

解决方案是从导航集合中删除 [InverseProperty()] 注释，并将以下内容添加到 OnModelCreating(ModelBuilder builder) 定义

The work around was to remove the [InverseProperty()] annotations from the navigation collections, and add the following to the OnModelCreating(ModelBuilder builder) definition

    builder
        .Entity<GroupToContactLink>()
        .HasOne(gtc => gtc.Group)
        .WithMany(g => g.ContactLinks);

    builder
        .Entity<GroupToContactLink>()
        .HasOne(gtc => gtc.Contact)
        .WithMany(c => c.GroupLinks);

    builder
        .Entity<GroupToUnitLink>()
        .HasOne(gtc => gtc.Group)
        .WithMany(g => g.UnitLinks);

    builder
        .Entity<GroupToUnitLink>()
        .HasOne(gtc => gtc.Unit)
        .WithMany(c => c.GroupLinks);

这篇关于由于模型 InverseProperty，Asp.net core 2.1 崩溃的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！