C#实现简单俄罗斯方块

private Block currentBlock;
private Block nextBlock;
private int score;
private bool blockFalling;
 
 private void button1_Click(object sender, EventArgs e)
 {
  pictureBox1.Refresh();
  currentBlock = new Block(new Point(GameField.Width / 2 * GameField.SquareSize, 0), Block.BlockTypes.Undefined);
  currentBlock.Show(GameField.WinHandle);
  nextBlock = new Block(new Point(15, 15), Block.BlockTypes.Undefined);
  nextBlock.Show(pictureBox2.Handle);
  timer1.Enabled = true;
  button1.Enabled = false;
  Focus();
  score = 0;
 }
 
 private void Form1_Load(object sender, EventArgs e)
 {
  GameField.WinHandle = pictureBox1.Handle;
  GameField.BackColor = pictureBox1.BackColor;
 }
 
 private void Form1_KeyDown(object sender, KeyEventArgs e)
 {
  if (currentBlock == null)
  {
  return;
  }
  switch (e.KeyCode)
  {
  case Keys.W:
   currentBlock.Rotate();
   break;
  case Keys.S:
   currentBlock.Down();
   break;
  case Keys.A:
   currentBlock.Left();
   break;
  case Keys.D:
   currentBlock.Right();
   break;
  }
 }
 
 private void timer1_Tick(object sender, EventArgs e)
 {
  if (!currentBlock.Down())
  {
  blockFalling = false;
  //塞满了 游戏结束 0 0
  if (currentBlock.Top() == 0)
  {
   timer1.Enabled = false;
   button1.Enabled = true;
   GameField.Reset();
   MessageBox.Show("恭喜你跪了");
   return;
  }
  
  }
  else
  {
  blockFalling = true;
  }
  if (!blockFalling)
  {
  //检查得分
  int earseCount = GameField.CheckLines();
  if (earseCount > 0)
  {
   score += earseCount * 20;
   label1.Text = score.ToString();
   //使图片框重绘 清楚Block
   pictureBox1.Invalidate();
   Application.DoEvents();
   GameField.Redraw();
  }
  pictureBox2.Invalidate();
  Application.DoEvents();
  currentBlock = new Block(new Point(GameField.Width / 2 * GameField.SquareSize, 0), nextBlock.BlockType);
  currentBlock.Show(GameField.WinHandle);
 
 
  nextBlock = new Block(new Point(15, 15), Block.BlockTypes.Undefined);
  nextBlock.Show(pictureBox2.Handle);
  blockFalling = true;
  }
 }
 
 private void Form1_Activated(object sender, EventArgs e)
 {
  GameField.Redraw();
  if (nextBlock !=null)nextBlock.Show(pictureBox2.Handle);
 }