一、题目：6-6 设计一个象棋游戏。ChessPiece为抽象类，提供代表一个棋子位置的属性和方法，和isMoveLegal方法。还有继承ChessPiece的具体类（如车，马，帅等），这些类要能根据各自的特点具体实现isMoveLegal。

答：第一步：
namespace 书本例题
{
    public abstract class ChessPiece
    {
        public abstract void isMoveLegal();
    }
    //车类
    public class Chariot : ChessPiece
    {
        int ChariotX,ChariotY;
        public Chariot()
        {
            this.ChariotX = 1;
            this.ChariotY = 1;
        }
        public Chariot(int _x,int _y)
        {
            this.ChariotX = _x;
            this.ChariotY = _y;
        }
        public override void isMoveLegal()
        {
            Console.WriteLine("战车当前位置为：({0},{1})", this.ChariotX, this.ChariotY);
            int k;
            do
            {
                Console.WriteLine("请输入“战车”移动的步子：");
                k = Convert.ToInt32(Console.ReadLine());
            } while (k < 1 || k > 9);
           
            
            //前进
            this.ChariotX = this.ChariotX + 0;
            this.ChariotY = this.ChariotY + k;
            if (this.ChariotY > 8)
            {
                this.ChariotY = this.ChariotY - (this.ChariotY - 8);
            }
            Console.WriteLine("前进{0}步后的位置为：({1},{2})",k, this.ChariotX, this.ChariotY);

            //后退
            this.ChariotX = this.ChariotX + 0;
            this.ChariotY = this.ChariotY - k;
            if (this.ChariotY <= 0)
            {
                this.ChariotY = 1;
            }
            Console.WriteLine("后退{0}步后的位置为：({1},{2})", k, this.ChariotX, this.ChariotY);

            //左移
            this.ChariotX = this.ChariotX + k;
            this.ChariotY = this.ChariotY + 0;
            if (this.ChariotX > 8)
            {
                this.ChariotX = this.ChariotX - (this.ChariotX - 8);
            }
            Console.WriteLine("左移{0}步后的位置为：({1},{2})", k, this.ChariotX, this.ChariotY);

            //右移
            this.ChariotX = this.ChariotX - k;
            this.ChariotY = this.ChariotY + 0;
            if (this.ChariotX <= 0)
            {
                this.ChariotX = 1;
            }
            Console.WriteLine("右移{0}步后的位置为：({1},{2})", k, this.ChariotX, this.ChariotY);

        }

    }
    //马类
    //public class Horse : ChessPiece
    //{
    //}
    //炮类
    //public class Cannon : ChessPiece
    //{
    //}

    class Program
    {
        static void Main(string[] args)
        {
            ChessPiece CD;
            CD = new Chariot();  //战车
            CD.isMoveLegal();

            CD = new Chariot(2,4);
            CD.isMoveLegal();

            //战马

            //大炮

            Console.ReadKey();
        }
    }
}

二、困惑
1、我做不到在抽象类中表示属性？
2、还有，“提供代表一个棋子位置的属性和方法”中的“方法”是什么意思？
请高手大侠们指点迷津。谢谢！

测试下