我有一个使用 EF7 的 ASP.NET5 MVC 应用程序。到目前为止一切正常，我能够在数据库中添加迁移和持久数据。 现在，在将身份添加到我的数据层项目后，我在尝试添加新迁移时遇到此错误:

The entity type 'Microsoft.AspNet.Identity.EntityFramework.IdentityUserLogin' requires a key to be defined

我的上下文来自 IdentityDbContext:

public class ASSWebApiContext : IdentityDbContext<AppUser>

AppUser 类:

using Microsoft.AspNet.Identity.EntityFramework;
using System;

namespace ASS.DomainDataModel.Models
{
    public class AppUser : IdentityUser
    {
        public string AppUserId { get; set; }
        public DateTime FirstFlight { get; set; }
    }
}

项目.json

{
  "version": "1.0.0-*",
  "description": "ASS.DomainDataModel Class Library",
  "authors": [ "xxxx" ],
  "tags": [ "" ],
  "projectUrl": "",
  "licenseUrl": "",

  "frameworks": {
    "dnx451": {
      "dependencies": {
      }
    },
    "dnxcore50": {
      "dependencies": {
      }
    }
  },

  "dependencies": {
    "ASS.DomainClasses": "1.0.0-*",
    "Microsoft.Extensions.PlatformAbstractions": "1.0.0-rc1-final",
    "Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0-rc1-final",
    "Microsoft.Extensions.Configuration.FileExtensions": "1.0.0-rc1-final",
    "Microsoft.Extensions.Configuration.Json": "1.0.0-rc1-final",
    "EntityFramework.Core": "7.0.0-rc1-final",
    "EntityFramework.Commands": "7.0.0-rc1-final",
    "EntityFramework.Relational": "7.0.0-rc1-final",
    "System.Linq.Expressions": "4.0.11-beta-23516",
    "EntityFramework.MicrosoftSqlServer": "7.0.0-rc1-final",
    "Microsoft.AspNet.Identity.EntityFramework": "3.0.0-rc1-final"
  },

    "commands": {
    "ef": "EntityFramework.Commands"
  }
}

我在这里所做的就是加载相关的新包: “Microsoft.AspNet.Identity.EntityFramework”:“3.0.0-rc1-final”，添加了 AppUser 类 - 仅此而已。我有一个使用 beta-8 的类似项目，使用完全相同的模式，它在没有问题的情况下工作。 beta-8和rc-1有没有相关的变化？

谢谢!

下面是 ASSWebApiContext 的一部分。大多数具有 DbSet 的实体都有一个 modelBuilder.Entity。所以文件持续了很长一段时间......

using Microsoft.Data.Entity;
using ASS.DomainClasses.Entities;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.PlatformAbstractions;
using System.Linq;
using ASS.DomainClasses.Interfaces;
using System;
using Microsoft.AspNet.Identity.EntityFramework;

namespace ASS.DomainDataModel.Models
{
    public class ASSWebApiContext : IdentityDbContext<AppUser>
    {
        public IConfigurationBuilder Config { get; set; }
        public IConfigurationRoot _Configuration { get; private set; }

        public ASSWebApiContext(IApplicationEnvironment appEnv)
        {
            Database.EnsureCreated();

            Config = new ConfigurationBuilder()
                .SetBasePath(appEnv.ApplicationBasePath)
                .AddJsonFile("config.json");

            _Configuration = Config.Build();

        }

        public DbSet<Address> Addresses { get; set; }
        public DbSet<AddressType> AddressTypes { get; set; }
        public DbSet<Aircraft> Aircrafts { get; set; }
        public DbSet<AircraftModel> AircraftModels { get; set; }
        public DbSet<AircraftOwner> AircraftOwners { get; set; }
        public DbSet<AircraftOwnerType> AircraftOwnerTypes { get; set; }
        public DbSet<Country> Countries { get; set; }
        public DbSet<GPEncodingType> GPEncodingTypes { get; set; }
        public DbSet<LocationPoint> LocationPoints { get; set; }
        public DbSet<Manufacturer> Manufacturer { get; set; }
        public DbSet<Pilot> Pilots { get; set; }
        public DbSet<ServiceProvider> ServiceProviders { get; set; }
        public DbSet<State> States { get; set; }
        public DbSet<Trip> Trips { get; set; }
        public DbSet<Stop> Stops { get; set; }
        public DbSet<Track> Tracks { get; set; }


        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {


            modelBuilder.Entity<AddressType>(
                e =>
                {
                    e.Property(n => n.AddressTypeId).IsRequired().UseSqlServerIdentityColumn();
                    e.Property(n => n.Name).IsRequired().HasMaxLength(15);
                    e.Ignore(n => n.IsDirty);
                });

            modelBuilder.Entity<Address>(
                e =>
                {
                    e.Property(n => n.AddressId).IsRequired().UseSqlServerIdentityColumn();
                    e.Property(n => n.AddressTypeId).IsRequired();
                    e.Property(i => i.CountryId).HasMaxLength(2);
                    e.Property(i => i.AddrLine1).HasMaxLength(256);
                    e.Property(i => i.AddrLine2).HasMaxLength(256);
                    e.Property(i => i.AddrLine3).HasMaxLength(256);
                    e.Property(i => i.Postcode).HasMaxLength(50);
                    e.Ignore(n => n.IsDirty);
                });
...

最佳答案

基本上，Identity 表的键映射到 IdentityDbContext 的 OnModelCreating 方法中，如果不调用此方法，您最终会得到您得到的错误。如果您从 IdentityDbContext 派生并像您在代码中所做的那样提供您自己的 OnModelCreating 定义，则不会调用此方法。使用此设置，您必须使用 base.OnModelCreating 语句显式调用 IdentityDbContext 的 OnModelCreating 方法。 This answer还讨论了我在此处发布的选项

关于c# - 实体类型 'Microsoft.AspNet.Identity.EntityFramework.IdentityUserLogin<string>' 需要定义键，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/34000091/