.NET-数组中的数组循环遍历

static void Main(string[] args)
        {
            int[][] arr = new int[3][];
            arr[0] = new int[] { 1,2,3};
            arr[1] = new int[] { 4,5 };
            arr[2] = new int[] { 6 };

            foreach(int[] i in arr)
            {
                foreach(int j in i)
                {
                    Console.WriteLine(j);
                }
            }

            for (int i= 0;i < arr.GetLength(0); i++){
                for(int j = 0; j < arr[i].Length; j++)
                {
                    Console.WriteLine(arr[i][j]);
                }
            }
        }