EF 6 - 无效的列名称'Discriminator',两个DbContexts

Question

我有一个MVC 5应用程序.我想使用标准的aspnet.identity提供程序来启用用户通过标准\ Account视图登录.但是,我还需要连接到第三方数据库,并且也希望首先使用EF代码.

我从Scott Allen Pluralsight获取的主数据库的上下文.我不知道"ApplicationUser"类为什么或继续从IdentityUser继承,但它在他的视频和我创建的以前的网站中工作.它看起来如下:

namespace ESBAMPortal.DataLayer
{
    // You can add profile data for the user by adding more properties to your ApplicationUser class, please visit http://go.microsoft.com/fwlink/?LinkID=317594 to learn more.
    public class ApplicationUser : IdentityUser
    {
    }

    class PortalContext : IdentityDbContext<ApplicationUser>, ESBAMPortal.DataLayer.IPortalContext
    {
        public PortalContext()
            : base("ESBamPortalConString")
        {
            this.Configuration.LazyLoadingEnabled = false;
        }

        public virtual DbSet<DomainClasses.Portal> Portal {get; set;}
    }
}

第三方数据库的上下文如下:

namespace ESBAMPortal.DataLayer
{

    public class ESBContext : DbContext, ESBAMPortal.DataLayer.IESBContext
    {
        public ESBContext()
            : base("ESBExceptionConString")
        {
            this.Configuration.LazyLoadingEnabled = false;
        }
        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
        }

        public virtual DbSet<ActionType> ActionTypes { get; set; }
        public virtual DbSet<Alert> Alerts { get; set; }
        public virtual DbSet<AlertCondition> AlertConditions { get; set; }
        public virtual DbSet<AlertEmail> AlertEmails { get; set; }
        public virtual DbSet<AlertHistory> AlertHistories { get; set; }
        public virtual DbSet<AlertSubscription> AlertSubscriptions { get; set; }
        public virtual DbSet<AlertSubscriptionHistory> AlertSubscriptionHistories { get; set; }
        public virtual DbSet<AuditLog> AuditLogs { get; set; }
        public virtual DbSet<AuditLogMessageData> AuditLogMessageDatas { get; set; }
        public virtual DbSet<Batch> Batches { get; set; }
        public virtual DbSet<Configuration> Configurations { get; set; }
        public virtual DbSet<ContextProperty> ContextProperties { get; set; }
        public virtual DbSet<Fault> Faults { get; set; }
        public virtual DbSet<Message> Messages { get; set; }
        public virtual DbSet<MessageData> MessageDatas { get; set; }
        public virtual DbSet<ProcessedFault> ProcessedFaults { get; set; }
        public virtual DbSet<UserSetting> UserSettings { get; set; }
    }
}

当我运行网站时,我可以从第三方网站上提取数据.但是,当我尝试登录时,我收到消息:

Invalid column name 'Discriminator'

这是因为打电话而引发的:

var user = await UserManager.FindAsync(model.UserName, model.Password);

运行EF Profiler我可以看到它正在尝试执行以下SQL:

SELECT [Limit1].[C1]            AS [C1],
       [Limit1].[Id]            AS [Id],
       [Limit1].[UserName]      AS [UserName],
       [Limit1].[PasswordHash]  AS [PasswordHash],
       [Limit1].[SecurityStamp] AS [SecurityStamp]
FROM   (SELECT TOP (1) [Extent1].[Id]            AS [Id],
                       [Extent1].[UserName]      AS [UserName],
                       [Extent1].[PasswordHash]  AS [PasswordHash],
                       [Extent1].[SecurityStamp] AS [SecurityStamp],
                       '0X0X'                    AS [C1]
        FROM   [dbo].[AspNetUsers] AS [Extent1]
        WHERE  ([Extent1].[Discriminator] = N'ApplicationUser')
               AND ((((UPPER([Extent1].[UserName])) = (UPPER('rob' /* @p__linq__0 */)))
                     AND (NOT ((UPPER([Extent1].[UserName]) IS NULL)
                                OR (UPPER('rob' /* @p__linq__0 */) IS NULL))))
                     OR ((UPPER([Extent1].[UserName]) IS NULL)
                         AND (UPPER('rob' /* @p__linq__0 */) IS NULL)))) AS [Limit1]

问题是,AspNetUsersTable没有鉴别器列.

有谁能解释我哪里出错了以及我该如何解决？

Answer 1

我回到基础,创建了一个新的MVC 5应用程序,然后通过从包管理器控制台运行以下代码来生成数据库迁移:

• 启用的迁移
• 首先添加迁移

当我检查生成的代码时,我可以看到它在AspNetUsers表中包含了一个"Discriminator"列.我回到了我的"真实"解决方案并比较了我单独的DataAccess项目中的"第一个"迁移代码.这段代码没有"Discriminator"列,我还注意到它有其他列,如"PhoneNumber"和"TwoFactorEnabled".这让我觉得MVC5模板可能正在使用以前版本的"Microsoft.AspNet.Identity.EntityFramework" - 事实证明是这样的.

为了解决这个问题,我访问了MVC5 Web应用程序的Manage Nuget Packages对话框,卸载了"Microsoft.AspNet.Identity.EntityFramework"(v1.0),然后重新安装(v2.0).随后当我从网站登录时,它没有试图找到一个"鉴别器"列,一切都很好.

我想这给了我一个宝贵的教训,让我更加关注VS模板使用的Nuget包上的版本