EF Core 中多态关系的模型生成器

问：

我正在尝试进行多态关联，但我的模型构建器无法正常工作

员工类

public class Employee
{
    public int Id { get; set; } // Unique identifier for the employee
    public ICollection<Directory> Directories { get; set; } // Collection of directories for the employee
}

Client 类

public class Client
{
    public int Id { get; set; } // Unique identifier for the client
    public ICollection<Directory> Directories { get; set; } // Collection of directories for the client
}

Directory 类

public class Directory
{
    public int Id { get; set; }
    public UserType Type { get; set; } // "Employee"(0) or "Client"(1)
    public int TypeId { get; set; } // Id of the respective Employee or Client
    public string Title { get; set; }
}

模型构建器

modelBuilder.Entity<Directory>()
            .HasKey(p => p.Id);

        modelBuilder.Entity<Directory>()
            .HasDiscriminator<UserType>("Type")
            .HasValue<Employee>(UserType.Employee)
            .HasValue<Client>(UserType.Client);

        modelBuilder.Entity<Directory>()
            .HasOne<Employee>()
            .WithMany(e => e.Directories)
            .HasForeignKey(p => p.TypeId);

        modelBuilder.Entity<Directory>()
            .HasOne<Client>()
            .WithMany(c => c.Directories)
            .HasForeignKey(p => p.TypeId);
    }

这是我收到的错误

无法为实体类型配置鉴别器值 “Employee”，因为它不是从“目录”派生的

我希望避免创建从纸张到员工或客户的对象关系

你会给我什么建议？