using System;

​

public class Program

{

    public static void Main()

    {

        var Matrix = SpiralMatrix.GetMatrix(9);

        for (int i = 0; i < Matrix.GetLength(0); i++)

        {

            for (int j = 0; j < Matrix.GetLength(1); j++)

            {

                Console.Write(Matrix[i, j].ToString("D2") + " ");

            }

            Console.WriteLine();

        }

    }

}

​

public class SpiralMatrix

{

    public static int[,] GetMatrix(int size)

    {

        int[,] Matrix = new int[size, size];

        int currentValue = 1;

        int currentLineLength = size;

​

        int y = 0;

        int x = 0;

        int currentDirection = 0;

        int[] dY = [0, 1, 0, -1];

        int[] dX = [1, 0, -1, 0];

​

        while (currentLineLength > 0)

        {

            for (int i = 0; i < currentLineLength; i++)

            {

                Matrix[y, x] = currentValue++;

                if (i + 1 < currentLineLength)

                {

                    y += dY[currentDirection];

                    x+= dX[currentDirection];

                }

            }

            currentDirection = (currentDirection + 1) % 4;

            y += dY[currentDirection];

            x += dX[currentDirection];

            if (currentDirection % 2 == 1) currentLineLength--;

        }

​

        return Matrix;

    }

}

​