螺旋打印二维数组

 public static void Show(){
        // 1,2,3,7,8,4,9,5,6
        int[][] arr = new int[][]{
            new int[]{1,2,3},
            new int[]{5,6,7},
            new int[]{9,4,8}
        };
        int tr = 0;
        int tc = 0;
        int dr = arr.Length - 1;
        int dc = arr[1].Length - 1;
        while(tr <= dr && tc <= dc){
            PrintLX(arr,tr,tc,dr,dc);
            tr++;
            tc++;
            dr--;
            dc--;
        }
    }

    public static void PrintLX(int[][] arr,int a,int b,int c,int d){
        if(a==c){// 同一行
            for(int i=d; i<=c;i++) System.Console.WriteLine(arr[a][i]);
        }
        else if(b==d){ // 同一列
            for(int i=b; i<=d;i++) System.Console.WriteLine(arr[i][d]);
        }else{
            int curC = a;
            int curR = b;
            while(curC < d){ // 先行
                System.Console.WriteLine(arr[a][curC]);
                curC++;
            }
            while(curR < c){ // 列
                System.Console.WriteLine(arr[curR][d]);
                curR++;
            }

            while(curC > 0){ // 先行
                System.Console.WriteLine(arr[c][curC]);
                curC--;
            }
            while(curR > 0){ // 列
                System.Console.WriteLine(arr[curR][b]);
                curR--;
            }
        }
    }