C# EntityType“IdentityUserLogin”未定义密钥

我正在尝试在我的应用程序中使用个人用户帐户。当我为任何与ApplicationUser类相关的类而不是ApplicationUser本身进行迁移时，我得到的错误是IdentityUserLogin、IdentityUserRole等没有定义键

正如其他答案中所提到的，我已将调用添加到OnModelCreating，但没有任何运气：

public class IdentityDb : IdentityDbContext<ApplicationUser>
    {
        public IdentityDb() : base("DefaultConnection")
        {

        }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            base.OnModelCreating(modelBuilder);
            modelBuilder.Conventions.Remove<OneToManyCascadeDeleteConvention>();
            modelBuilder.Conventions.Remove<ManyToManyCascadeDeleteConvention>();
        }

    }

我找到了答案

我将OnModelCreating方法放错了位置，将其放在IdentityDbContext类中。相反，与IdentityUser类相关的每个类都有自己的DbContext类，所有DbContext类都必须调用如下所示的方法：

protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            base.OnModelCreating(modelBuilder);
            modelBuilder.Conventions.Remove<OneToManyCascadeDeleteConvention>();
            modelBuilder.Conventions.Remove<ManyToManyCascadeDeleteConvention>();
        }

public class Certificate
{
    public string CertificateId { get; set; }
    [Display(Name = "Certification-date")]
    public DateTime? DateOfCertification { get; set; }
    public string Name { get; set; }
    [Display(Name = "Name of certifier")]
    public string CertificationProvider { get; set;}
    public virtual ApplicationUser ApplicationUser { get; set; }
    public int ApplicationUserId { get; set; }
}

protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            base.OnModelCreating(modelBuilder);
            modelBuilder.Conventions.Remove<OneToManyCascadeDeleteConvention>();
            modelBuilder.Conventions.Remove<ManyToManyCascadeDeleteConvention>();
        }