EF Code first Generic Entity & EntityTypeConfiguration
本文关键字:amp EntityTypeConfiguration Entity Code first Generic EF | 更新日期: 2023-09-27 18:36:26
我即将为我的实体创建一个通用Entity
和EntityTypeConfiguration
。 这是我的课程:
目录
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; }
}
实体.cs
public abstract class BaseEntity
{
}
public abstract class Entity<T> : BaseEntity, IEntity<T>
{
public virtual T Id { get; set; }
}
public abstract class AuditableEntity<T> : Entity<T>, IAuditableEntity<T>
{
public DateTime CreatedAt { get; set; }
public virtual Membership.User CreatedBy { get; set; }
public int? CreatedById { get; set; }
public DateTime? DeletedAt { get; set; }
public virtual Membership.User DeletedBy { get; set; }
public int? DeletedById { get; set; }
public T RevisionParentId { get; set; }
public bool isLastVersion { get; set; }
}
问题是当我尝试定义可审计实体的通用实体类型配置时,因为:
public class AuditableEntityConfig<T> : System.Data.Entity.ModelConfiguration.EntityTypeConfiguration<T> where T : AuditableEntity<int>
{
public AuditableEntityConfig()
{
HasOptional(x => x.CreatedBy).WithMany().HasForeignKey(x => x.CreatedById);
HasOptional(x => x.DeletedBy).WithMany().HasForeignKey(x => x.DeletedById);
Property(x => x.DeletedAt).IsOptional();
Property(x => x.RevisionParentId).IsOptional();
}
}
public class User : AuditableEntity<long>
{
}
你看我不得不AuditableEntity<int>
这是错误的,我不知道该更换什么才能让它工作。 AuditableEntity<int>
应该是类似 AuditableEntity<T>
的东西,T 可以是字符串、整数、指导、长整型、...
更新按照迈克回答的建议,我进行了更改并更新了我的问题:
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");
});
}
}
我现在收到 RevisionParentId
属性的此错误:
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>>)
在这一行中:
Property(x => x.RevisionParentId).IsOptional();
where T : AuditableEntity<T>
将导致递归类型检查。请尝试
更新
public class AuditableEntityConfig<T, TK> : System.Data.Entity.ModelConfiguration.EntityTypeConfiguration<T>
where T : AuditableEntity<TK> where TK : struct { }