clean-tictactoe/CleanTicTacToe/MainForm.cs

using System;
using System.Drawing;
using System.Windows.Forms;
using TicTacToe;

namespace CleanTicTacToe {
    public partial class MainForm : Form {
        private const int BUTTONSIZE = 100;
        private readonly Grid _grid;
        private readonly Button[,] _pbxs = new Button[Grid.GRIDSIZE, Grid.GRIDSIZE];
        public MainForm() {
            InitializeComponent();
            _grid = new Grid();
            _grid.ExpectNextTurn += Grid_ExpectNextTurn;
            _grid.GameOver += Grid_GameOver;
            for (var x = 0; x < Grid.GRIDSIZE; x++)
                for (var y = 0; y < Grid.GRIDSIZE; y++) {
                    var pictureBox = new Button() {
                        Location = new Point(x * BUTTONSIZE, y * BUTTONSIZE),
                        Width = BUTTONSIZE,
                        Height = BUTTONSIZE,
                        Tag = (x, y)
                    };
                    pictureBox.Click += Grid_Click;
                    Controls.Add(pictureBox);
                    _pbxs[x, y] = pictureBox;
                }
        }

        private void Grid_GameOver(object sender, Player e) {
            TslStatus.Text = $"Player {e} has won!";
            _grid.Reset();
        }

        private void Grid_ExpectNextTurn(object sender, Player e) {
            TslStatus.Text = $"Player {e} must now pick a spot!";
        }

        private void Grid_Click(object sender, EventArgs e) {
            if (!(sender is Button pictureBox))
                throw new InvalidProgramException("Expected picturebox as sender!");
            (var x, var y) = ((int x, int y))pictureBox.Tag;
            TslStatus.Text = $"Spot {x},{y} clicked!";
            try {
                _grid.PickSpot(x, y);
            } catch (Exception ex) {
                TslStatus.Text = ex.Message;
            }
            RefreshPbxs();
        }

        private void RefreshPbxs() {
            for (var x = 0; x < Grid.GRIDSIZE; x++)
                for (var y = 0; y < Grid.GRIDSIZE; y++) {
                    _pbxs[x, y].Text = $"{Grid.GetPlayerChar(_grid[x, y])}";
                }
        }
    }
}