C# EF代码第一通用实体&；EntityTypeConfiguration

我将为我的实体创建一个通用的

实体

和

实体类型配置

。以下是我的课程：

Entity

public interface IEntity<T>
{
    T Id { get; set; }
}

public interface IAuditableEntity<T>
{
    DateTime CreatedAt { get; set; }
    Membership.User CreatedBy { get; set; }
    int? CreatedById { get; set; }
    DateTime? DeletedAt { get; set; }
    Membership.User DeletedBy { get; set; }
    int? DeletedById { get; set; }
    T RevisionParentId { get; set; }
    bool isLastVersion { get; set; }
}

在这行中：

Property(x => x.RevisionParentId).IsOptional();

---

其中T:AuditableEntity

将导致递归类型检查。请试一试

已更新

public class AuditableEntityConfig<T, TK> : System.Data.Entity.ModelConfiguration.EntityTypeConfiguration<T>
    where T : AuditableEntity<TK> where TK : struct { }

公共类AuditableEntityConfig:System.Data.Entity.ModelConfiguration.EntityTypeConfiguration 其中T:AuditableEntity，其中TK:struct{}

---

你到底想“工作”什么。如果您的实体类型配置是泛型类型T，那么数据库中映射到

RevisionParentId

的字段应该是什么数据类型？通过将此字段的类型设置为泛型，您试图实现什么目的？

RevisionParentId

是同一实体的自引用外键。例如：我有一个

Post

实体，它的

Id

类型为

T

。因此，

RevisionParentId

应该是

T

类型，以尝试我的更新解决方案。在

AuditableEntity

public class User : AuditableEntity<int>
{
    [Index("IX_uniqueUsername", IsUnique = true)]
    public string Username { get; set; }
    public string Password { get; set; }
    public string Email { get; set; }
    public bool Active { get; set; }
    public virtual List<Role> Roles { get; set; }
    public virtual List<UserGroup> Groups { get; set; }
    public virtual UserProfile Profile { get; set; }
    public bool isSuperAdmin { get; set; }
}

public class UserConfig : AuditableEntityConfig<User, int>
{
    public UserConfig()
    {
        ToTable("Account_Users");
        Property(x => x.Username).HasMaxLength(200).IsRequired();
        Property(x => x.Password).HasMaxLength(200).IsRequired();
        Property(x => x.Email).HasMaxLength(200);
        HasMany(x => x.Roles).WithMany(x => x.Users).Map(x =>
        {
            x.ToTable("Account_UserRoles");
            x.MapLeftKey("UserId");
            x.MapRightKey("RoleId");
        });
        HasMany(x => x.Groups).WithMany(x => x.Users).Map(x =>
        {
            x.ToTable("Account_UserGroups");
            x.MapLeftKey("UserId");
            x.MapRightKey("GroupId");
        });
    }
}

The type 'TK' must be a non-nullable value type in order to use it as parameter 'T' in the generic type or method 'System.Data.Entity.ModelConfiguration.Configuration.StructuralTypeConfiguration<TStructuralType>.Property<T>(System.Linq.Expressions.Expression<System.Func<TStructuralType,T>>)

Property(x => x.RevisionParentId).IsOptional();

public class AuditableEntityConfig<T, TK> : System.Data.Entity.ModelConfiguration.EntityTypeConfiguration<T>
    where T : AuditableEntity<TK> where TK : struct { }