C#用类获取二维数组指定方向上的元素（以及静态，结构，类，常量的笔记）

本文链接：https://blog.youkuaiyun.com/qq_59081708/article/details/123580822

1.代码

1.1 main 部分（Program.cs）

 static void Main()
        {
            string[,] array = new string[3, 4];
            for (int i = 0; i < array.GetLength(0); i++)
            {
                for (int j = 0; j < array.GetLength(1); j++)
                {
                    array[i, j] = i.ToString() + j.ToString();
                }
            }
            string[] result = DoubleArrayHelper.GetElements(array,2,0,Direction.Right,5);
        }

1.2 Direction 部分（Direction.cs）

class Direction//引用类型
    {
        private int rIndex;

        public int RIndex
        {
            get { return this.rIndex; }
            set { this.rIndex = value; }
        }
        public int CIndex { get; set; }
        public Direction() { }
        public Direction(int rIndex,int cIndex)
        {
            this.rIndex = rIndex;
            this.CIndex = cIndex;
        }
        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); }
        }
    }

1.3 获取二维数组部分(DoubleArrayHelper.cs)

class DoubleArrayHelper
    {/// <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">数量</param>
    /// <returns>所有满足条件的元素</returns>
        public static string[]GetElements(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();
        }
    }