二维数组的方向获取（简单写法）

class Program
    {
        static void Main(string[] args)
        {
            string[,] array = new string[3, 4];
            for (int r = 0; r < array.GetLength(0); r++)
            {
                for (int c = 0; c < array.GetLength(1); c++)
                {
                    array[r, c] = r.ToString() + c.ToString();
                }
            }
            string[] result = ArrayHelper.GetElement(array, 1, 0, Direction.Right, 6);

        }
    }

/// <summary>
    /// 方向结构
    /// </summary>
    struct Direction
    {
        //自动属性
        /// <summary>
        /// 行索引
        /// </summary>
        public int RIndex { get; set; }
        /// <summary>
        /// 列索引
        /// </summary>
        public int CIndex { get; set; }
        
        //构造函数
        public Direction(int rIndex, int cIndex)
        {
            this.RIndex = rIndex;
            this.CIndex = cIndex;
        }

        //静态属性
        public static Direction Up
        {
            get
            {
                return new Direction(-1, 0);
            }
        }
        public static Direction Down
        {
            get
            {
                return new Direction(1, 0);
            }
        }
        public static Direction Left
        {
            get
            {
                return new Direction(0, -1);
            }
        }
        public static Direction Right
        {
            get
            {
                return new Direction(0, 1);
            }
        }
    }

/// <summary>
    /// 二维数组工具类
    /// </summary>
    static class ArrayHelper
    {
        /// <summary>
        /// 获取二维数组元素
        /// </summary>
        /// <param name="array">二维数组</param>
        /// <param name="rIndex">行索引</param>
        /// <param name="cIndex">列索引</param>
        /// <param name="dir">方向</param>
        /// <param name="count">希望查找的个数</param>
        /// <returns>所有满足条件的元素</returns>
        public static string[] GetElement(string[,] array, int rIndex, int cIndex,Direction dir,int count)
        {
            List<string> result = new List<string>(count);
            for (int i = 0; i < count; i++)
            {
                rIndex += dir.RIndex;
                cIndex += dir.CIndex;
                if (rIndex >= 0 && rIndex < array.GetLength(0) && cIndex >= 0 && cIndex < array.GetLength(1))
                    result.Add(array[rIndex, cIndex]);
            }
            return result.ToArray();
        }
    }