Question

我用EF架设了数据库，并将mydbcontext更改为从IdentityDbContext继承，因为我希望所有内容都在一个dbcontext之下。

问题是，当我启动应用程序并在登录页面中写入凭据时，出现异常：

实体类型“ AspNetUserLogins”要求定义主键

我以前没听说过，因为我在打电话给base.OnModelCreating(modelBuilder);我在做什么错了？

public partial class AdventuresContext : IdentityDbContext<ApplicationUser> 
{
    public AdventuresContext()
    {
    }

    public AdventuresContext(DbContextOptions<AdventuresContext> options)
        : base(options)
    {
    }

    public virtual DbSet<Adventures> Adventures { get; set; }
    public virtual DbSet<AspNetRoleClaims> AspNetRoleClaims { get; set; }
    public virtual DbSet<AspNetRoles> AspNetRoles { get; set; }
    public virtual DbSet<AspNetUserClaims> AspNetUserClaims { get; set; }
    public virtual DbSet<AspNetUserLogins> AspNetUserLogins { get; set; }
    public virtual DbSet<AspNetUserRoles> AspNetUserRoles { get; set; }
    public virtual DbSet<AspNetUserTokens> AspNetUserTokens { get; set; }
    public virtual DbSet<AspNetUsers> AspNetUsers { get; set; }

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        if (!optionsBuilder.IsConfigured)
        {
            optionsBuilder.UseSqlServer("Data Source=(localdb)\\MSSQLLocalDB;Initial Catalog=Adventures");
        }
    }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);

        modelBuilder.HasAnnotation("ProductVersion", "2.2.4-servicing-10062");

        modelBuilder.Entity<Adventures>(entity =>
        {
            entity.HasIndex(e => e.UserId);

            entity.Property(e => e.CountryCodeIso03from).HasColumnName("CountryCodeISO03From");

            entity.Property(e => e.CountryCodeIso03to).HasColumnName("CountryCodeISO03To");

            entity.Property(e => e.Name).HasMaxLength(50);

            entity.Property(e => e.ShortDescription).HasMaxLength(128);

            entity.Property(e => e.Timestamp).IsRowVersion();

            entity.Property(e => e.UserId).IsRequired();

            entity.HasOne(d => d.User)
                .WithMany(p => p.Adventures)
                .HasForeignKey(d => d.UserId)
                .OnDelete(DeleteBehavior.ClientSetNull)
                .HasConstraintName("FK_Adventures_Adventures");
        });
     }
 }

Answer 1

我相信有两种方法可以解决此问题。

您可以使用getter和setter将[Key]添加到AspNetUserLogins类的公共属性上，例如：

[Key]
public int SomeFieldName {get;set;}

或者您可以使用OnModelCreating重写来调用HasNoKey（），例如：

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    modelBuilder
    .Entity<AspNetUserLogins>(o =>
    {
        o.HasNoKey();
    });
}

Answer 2

AspNetUsersLogins是Identity附带的标准类。它有2个主键，分别是LoginProvider和ProviderKey。我试图将它们从字符串更改为Guid，但仍然是相同的消息。我还尝试将两个属性都设置为[Key]属性，但我有一个异常：“ InvalidOperationException：实体类型'AspNetUserLogins'具有使用数据注释定义的复合主键。要设置复合主键，请使用fluent API。” 。还有其他想法吗？EF架设的AspNetUsersLogins看起来像这样：

public partial class AspNetUserLogins
{

    public string LoginProvider { get; set; }
    public string ProviderKey { get; set; }
    public string ProviderDisplayName { get; set; }
    public string UserId { get; set; }

    public virtual AspNetUsers User { get; set; }
}

Answer 3

由于您继承自IdentityDbContext，因此无需重新创建AspNet* DbSet，建议您删除所有内置的DbSet<AspNet*>和modelBuilder.Entity<AspNet*>.

public partial class AdventuresContext : IdentityDbContext<ApplicationUser>
{
    public AdventuresContext ()
    {
    }

    public AdventuresContext (DbContextOptions<AdventuresContext> options)
        : base(options)
    {
    }

    public virtual DbSet<Adventures> Adventures { get; set; }
    //remove below DbSet
    //public virtual DbSet<AspNetRoleClaims> AspNetRoleClaims { get; set; }
    //public virtual DbSet<AspNetRoles> AspNetRoles { get; set; }
    //public virtual DbSet<AspNetUserClaims> AspNetUserClaims { get; set; }
    //public virtual DbSet<AspNetUserLogins> AspNetUserLogins { get; set; }
    //public virtual DbSet<AspNetUserRoles> AspNetUserRoles { get; set; }
    //public virtual DbSet<AspNetUserTokens> AspNetUserTokens { get; set; }
    //public virtual DbSet<AspNetUsers> AspNetUsers { get; set; }

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        if (!optionsBuilder.IsConfigured)
        {
            optionsBuilder.UseSqlServer("Data Source=(localdb)\\MSSQLLocalDB;Initial Catalog=Adventures");
        }
    }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);
        //...
    } 
}

Startup.cs

public void ConfigureServices(IServiceCollection services)
    {
        services.AddControllersWithViews();
        services.AddRazorPages();

        var conn = "Data Source=(localdb)\\MSSQLLocalDB;Initial Catalog=Adventures";
        services.AddDbContext<AdventuresContext>(options =>
            options.UseSqlServer(conn));
        services.AddDefaultIdentity<ApplicationUser>()
            .AddEntityFrameworkStores<AdventuresContext>();
    }

实体类型“ AspNetUserLogins”是否需要定义主键？

3 个答案: