父类字段覆盖

public abstract class BaseEntity

    {



        public virtual int Id { get; set; }



        public override bool Equals(object obj)

        {

            return Equals(obj as BaseEntity);

        }



        public virtual bool Equals(BaseEntity other)

        {

            if (other == null || !(other is BaseEntity))

            {

                return false;

            }

            return (this == (BaseEntity)other);

        }



        public override int GetHashCode()

        {

            return Id.GetHashCode();

        }



        public static bool operator ==(BaseEntity x, BaseEntity y)

        {

            if ((object)x == null && (object)y == null)

            {

                return true;

            }



            if ((object)x == null || (object)y == null)

            {

                return false;

            }



            return x.Id == y.Id;

        }



        public static bool operator !=(BaseEntity x, BaseEntity y)

        {

            return !(x == y);

        }

    }

  public class Child:BaseEntity 

    {

        public Int32 F_Id { get; set; }

       public String Name{ get; set; }

    }