[Android] 使用Xamarin开发移动应用示例——数独游戏（四）产生新游戏算法改进

private async Task SetNewGame()
    {
      int k,m;
      var lst = chesses;
      var leng = lst.GetLength(0);
      
      if (ra == null)
      {
        ra = new Random();
      }
      k = ra.Next(0, leng);
      m = ra.Next(0, 9);
      var sudoku = lst[k].Sudoku;
      var mychess = new int[9, 9];
      for (var i = 0; i < 9; i++)
        for (var j = 0; j < 9; j++)
        {
          mychess[i, j] = int.Parse(sudoku.Substring(i * 9 + j, 1)) > 0 ? int.Parse(sudoku.Substring(i * 9 + j, 1)) + m : 0;
          if (mychess[i, j] > 9) mychess[i, j] = mychess[i, j] - 9;
        }
      SetGame(mychess);
    }