Question

我已经在.net框架中为数据访问层创建了mssql db和project（类库）。然后我在asp.net核心创建了项目。要访问此数据库，我在ConfigureServices方法中的启动类中使用。我在asp.net核心项目中使用EF核心。

services.AddDbContext<TradeEvoDbContext>(options =>
    options.UseSqlServer(Configuration.GetConnectionString("SqlDb")));
 services.AddIdentity<ApplicationUser, IdentityRole>()
         .AddEntityFrameworkStores<TradeEvoDbContext>()
         .AddDefaultTokenProviders();

这是我的DbContext类，它引用了我的类库proj。

using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using TradeEvo.Chat.Identity;
using TradeEvo.DAL.Models;

namespace TradeEvo.Chat.Models
{
    public class TradeEvoDbContext : IdentityDbContext<ApplicationUser>
    {
        public DbSet<GlobalSettings> GlobalSettings { get; set; }
        public DbSet<UserApiSettings> ApiSettings { get; set; }
        public DbSet<UserEBaySettings> EBaySettings { get; set; }
        public DbSet<User1CSettings> User1CSettings { get; set; }
        public DbSet<UserPayPalSettings> PayPalSettings { get; set; }
        public DbSet<CompanyInfo> CompanyInfo { get; set; }
        public DbSet<PromInfo> PromInfo { get; set; }
        public DbSet<ProductInfoMultiLang> ProductInfoMultiLang { get; set; }
        public DbSet<Category> Categories { get; set; }
        public DbSet<Genre> Genres { get; set; }
        public DbSet<PosterImage> PosterImages { get; set; }
        public DbSet<Order> Orders { get; set; }
        public DbSet<OrderNote> OrderNotes { get; set; }
        public DbSet<OrderItem> OrderItems { get; set; }
        public DbSet<OrderItemMont> OrderItemsMont { get; set; }
        public DbSet<OrderItemMontKey> OrderItemsMontKey { get; set; }
        public DbSet<OrderItemMontLink> OrderItemsMontLink { get; set; }
        public DbSet<OrderItemMontFile> OrderItemsMontFile { get; set; }
        public DbSet<UserInfo> UserInfo { get; set; }
        public DbSet<BlogPost> BlogPosts { get; set; }
        public DbSet<BlogComment> BlogComments { get; set; }
        public DbSet<TradeEvo.DAL.Models.Chat> Chats { get; set; }
        public DbSet<Message> Messages { get; set; }
        public DbSet<Status> Status { get; set; }
        public DbSet<StatusType> StatusType { get; set; }
        public DbSet<StatusTypeMapping> StatusTypeMapping { get; set; }
        public DbSet<DistributorProduct> DistributorProducts { get; set; }
        public DbSet<Product> Products { get; set; }
        public DbSet<ProductType> ProductType { get; set; }
        public DbSet<ProductContent> ProductContent { get; set; }
        public DbSet<ProductInfo> ProductInfo { get; set; }
        public DbSet<ProductMontChanges> ProductMontChanges { get; set; }
        public DbSet<ProductGenreMapping> ProductGenreMapping { get; set; }
        public DbSet<ProductAttribute> ProductAttributes { get; set; }
        public DbSet<ProductAttributeValue> ProductAttributeValues { get; set; }
        public DbSet<ProductAttributeMapping> ProductAttributeMapping { get; set; }
        public DbSet<ProductAttributeCombination> ProductAttributeCombinations { get; set; }
        public DbSet<ProductAttributeCombinationMapping> ProductAttributeCombinationMapping { get; set; }
        public DbSet<ProductCharacteristic> ProductCharacteristics { get; set; }
        public DbSet<ProductCharacteristicValue> ProductCharacteristicValues { get; set; }
        public DbSet<Group> Groups { get; set; }
        public DbSet<ProductListAttribute> ProductListAttributes { get; set; }
        public DbSet<ProductPromAttribut> ProductPromAttributes { get; set; }
        public DbSet<ProductList> ProductLists { get; set; }
        public DbSet<ProductListMapping> ProductListMapping { get; set; }
        public DbSet<ProductAvailability> ProductAvailability { get; set; }
        public DbSet<Currency> Currencies { get; set; }
        public DbSet<Language> Languages { get; set; }
        public DbSet<UserLanguage> UserLanguages { get; set; }
        public DbSet<ResourceMultiLang> ResourceMultiLang { get; set; }
        public DbSet<PromUaCategories> PromUaCategories { get; set; }
        public DbSet<OrderPromInfo> OrderPromInfo { get; set; }
        public DbSet<OrderItemProm> OrderItemProm { get; set; }
        public DbSet<Country> Countries { get; set; }
        public DbSet<Bank> Bank { get; set; }
        public DbSet<RecipientAddress> RecipientAddress { get; set; }
        public DbSet<SenderAddress> SenderAddress { get; set; }
        public DbSet<OrderInvoice> OrderInvoices { get; set; }
        public DbSet<CityNP> CityNP { get; set; }
        public DbSet<StreetNP> StreetNP { get; set; }
        public DbSet<WarehouseNP> WarehouseNP { get; set; }
        public DbSet<Setting> Settings { get; set; }
        public DbSet<OrderManufacturer> OrderManufacturs { get; set; }
        public DbSet<Purse> Purses { get; set; }
        public DbSet<PaymentSystem> PaymentSystem { get; set; }
        public DbSet<MoneyMovement> MoneyMovement { get; set; }
        public DbSet<MoneyMovementData> MoneyMovementData { get; set; }
        public DbSet<MoneyMovementType> MoneyMovementType { get; set; }
        public DbSet<ProductMultiDownloadData> ProductMultiDownloadData { get; set; }
        public DbSet<Address> Address { get; set; }
        public DbSet<Warehouse> Warehouses { get; set; }
        public DbSet<ShippingService> ShippingServices { get; set; }
        public DbSet<ShippingServiceUserMapping> ShippingServiceUserMapping { get; set; }
        public DbSet<ShippingServiceCountryMapping> ShippingServiceCountryMapping { get; set; }
        public DbSet<ShippingServiceProductMapping> ShippingServiceProductMapping { get; set; }
        public DbSet<UPAddress> UPAddress { get; set; }
        public DbSet<UPaddresses> UPaddresses { get; set; }
        public DbSet<UPEmails> UPEmails { get; set; }
        public DbSet<UPPhones> UPPhones { get; set; }
        public DbSet<UPClient> UPClient { get; set; }
        public DbSet<NPClient> NPClient { get; set; }
        public DbSet<PAdresses> PAdresses { get; set; }
        public DbSet<RecipientAddressCustomService> RecipientAddressCustomService { get; set; }
        public DbSet<UPShipment> UPShipment { get; set; }
        public DbSet<UPParcels> UPParcels { get; set; }
        public DbSet<UPParcelItems> UPParcelItems { get; set; }
        public DbSet<UPDiscount> UPDiscount { get; set; }
        public DbSet<UPDiscountPerClient> UPDiscountPerClient { get; set; }
        public DbSet<UPInternationalData> UPInternationalData { get; set; }
        public DbSet<UPLifeCycle> UPLifeCycle { get; set; }
        public DbSet<ImportExportSettings> ImportExportSettings { get; set; }
        public DbSet<ImportExportStructure> ImportExportStructures { get; set; }
        public TradeEvoDbContext(DbContextOptions<TradeEvoDbContext> options)
            : base(options)
        {
        }

        protected override void OnModelCreating(ModelBuilder builder)
        {
            base.OnModelCreating(builder);
            // Customize the ASP.NET Identity model and override the defaults if needed.
            // For example, you can rename the ASP.NET Identity table names and more.
            // Add your customizations after calling base.OnModelCreating(builder);
        }
    }
}

因此，当我尝试访问我的用户表时，例如：

var user = _context.Users.Where(x => x.Id == args[1]).FirstOrDefault();

或者：

var user = await _userManager.Users.FindByIdAsync(args[1]);

我有下一个例外：

{System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.AspNet.Identity.EntityFramework, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'. File can not be found.
File name: 'Microsoft.AspNet.Identity.EntityFramework, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'

所有堆栈跟踪都是：

{System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.AspNet.Identity.EntityFramework, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'. Не удается найти указанный файл.
File name: 'Microsoft.AspNet.Identity.EntityFramework, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'
   at System.Signature.GetSignature(Void* pCorSig, Int32 cCorSig, RuntimeFieldHandleInternal fieldHandle, IRuntimeMethodInfo methodHandle, RuntimeType declaringType)
   at System.Reflection.RuntimeMethodInfo.FetchNonReturnParameters()
   at System.Reflection.RuntimeMethodInfo.GetParametersNoCopy()
   at System.Reflection.RuntimePropertyInfo.GetIndexParametersNoCopy()
   at System.Reflection.RuntimePropertyInfo.GetIndexParameters()
   at System.Attribute.GetIndexParameterTypes(PropertyInfo element)
   at System.Attribute.InternalGetCustomAttributes(PropertyInfo element, Type type, Boolean inherit)
   at System.Reflection.CustomAttributeExtensions.GetCustomAttributes[T](MemberInfo element, Boolean inherit)
   at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.NotMappedMemberAttributeConvention.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.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 System.Linq.Queryable.Where[TSource](IQueryable`1 source, Expression`1 predicate)
   at TradeEvo.Chat.Controllers.HomeController.<ChatAsync>d__15.MoveNext() in myproj

我的控制器看起来像：

        private readonly UserManager<ApplicationUser> _userManager;
        private readonly SignInManager<ApplicationUser> _signInManager;
        private readonly ILogger _logger;
        private readonly TradeEvoDbContext _context;
        public HomeController(
            UserManager<ApplicationUser> userManager,
            SignInManager<ApplicationUser> signInManager,
            ILogger<HomeController> logger,
            TradeEvoDbContext context)
        {
            _userManager = userManager;
            _signInManager = signInManager;
            _logger = logger;
            _context = context;
        }

如果我使用nuget管理器并安装Microsoft.AspNet.Identity.EntityFramework，我将只修复此错误并在此代码行中获得新内容。 System.Web.HttpPostedFile ... File can not be found

我做错了什么？或者如何连接到现有的数据库？我被卡住了。

编辑＃1 Asp.net核心项目，csproj文件：

<PackageReference Include="Microsoft.AspNetCore.All" Version="2.0.6" />
    <PackageReference Include="Microsoft.AspNetCore.Identity" Version="2.0.2" />
    <PackageReference Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="2.0.2" />
    <PackageReference Include="Microsoft.AspNetCore.Owin" Version="2.0.2" />
    <PackageReference Include="Microsoft.AspNetCore.SignalR" Version="1.0.0-preview2-final" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="2.0.2" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="2.0.2" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="2.0.2" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools.DotNet" Version="2.0.0" />
    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="2.0.3" />
    <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="2.0.1" />

编辑＃2 怎么了？

Answer 1

请检查您的项目参考资料“Microsoft.AspNet.Identity.EntityFramework”库的版本是什么，并将其与web.config文件中的版本进行交叉验证，以获得相同的库。将web.config文件中的版本更改为项目中引用的库的正确版本。这将解决您的问题。

您还可以检查packages.config文件中的版本，

并在web.config中更新版本，如下所示，

Answer 2

库引用隐式包含该库引用的库。更简单地说，如果您有引用EF 6的库X并且您包含引用EF Core的库Y.然后，库Y将引用两者 EF 6和EF核心。

您可以混合使用EF6 / EF Core，但必须将它们相互隔离。如果您需要引用EF 6的库的某些部分，您必须将其分解到它自己的独立库中，而不引用EF 6。

实体框架核心与实体框架之间的冲突

2 个答案: