实体框架核心与实体框架之间的冲突

Question

I have already created mssql db and project (class library) for data access layer at .net framework. Then I created project at asp.net core. To access to this db I use in startup class within ConfigureServices method. I use EF core in asp.net core project.

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

And here is my DbContext class which reference to my class library 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);
        }
    }
}

So, when i try to access my users table such as:

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

Or:

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

I got next exception:

{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'

All stacktrace is:

{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

And my controller looks like:

        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;
        }

If I use nuget manager and install Microsoft.AspNet.Identity.EntityFramework, I will fix only this error and got new also at this line of code. System.Web.HttpPostedFile ... File can not be found

What am I doing wrong? Or how to connect to existing db ? I'm stuck.

Edit #1 Asp.net Core project, csproj file:

<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" />

Edit #2 What's wrong?

Answer 1

Please check in your project references what is the version of 'Microsoft.AspNet.Identity.EntityFramework' library and cross verify it with the version in web.config file for the same library. Change the version in web.config file to the correct version of the library referenced in the project. This will resolve your issue.

You can also check the version in packages.config file,

And update the version in web.config as below,

Answer 2

Library references implicitly include libraries referenced by that library. Put more simply, if you have library X that references EF 6 and you include it library Y that references EF Core. Library Y will then have references to both EF 6 and EF core.

You can mix and match your usage of EF6/EF Core, but you must segregate them from each other. If you need some portion of the library that references EF 6, you'll have to break that out into it's own separate library with no references to EF 6.