俄罗斯方块明确线问题

我正在为一个项目制作俄罗斯方块克隆。我差不多完成了，但我的清晰线条课程有一个我无法摆脱的错误。我制作了一个 10*20 的网格，我将精灵绘制到其中。当我在地板上得到一条线时，它工作正常，但在此之上，它只是删除该线并将它下面的所有内容也向下移动。这是我的明行类的代码：

public static void ClearLines()
{
    for (int CountY = Game1.LandedBlocks.GetLength(1) - 1; CountY >= 0; CountY--)
    {
        bool clearLine = true;
        for (int CountX = 0; CountX < Game1.LandedBlocks.GetLength(0); CountX++)
        {
            clearLine &= Game1.LandedBlocks[CountX, CountY] != -1;
        }
        if (clearLine)
        {
            for (int CountX = 0; CountX < Game1.LandedBlocks.GetLength(0); CountX++)
            {
                Game1.LandedBlocks[CountX, CountY] = -1;
            }
            for (int y = Game1.LandedBlocks.GetLength(1) - 1; y > 0; y--)
            {
                for (int CountX = 0; CountX < Game1.LandedBlocks.GetLength(0);                   CountX++)
                {
                    Game1.LandedBlocks[CountX, y] = Game1.LandedBlocks[CountX, y - 1];
                }
            }
            CountY++;
            Game1.rows++;
            Game1.score += 100;
        }
    }
}

如果有人能阐明该怎么做，我将不胜感激。我尝试了很多，但没有任何效果:(

            for (int y = Game1.LandedBlocks.GetLength(1) - 1; y > 0; y--)
            {
                for (int CountX = 0; CountX < Game1.LandedBlocks.GetLength(0); CountX++)
                {
                    Game1.LandedBlocks[CountX, y] = Game1.LandedBlocks[CountX, y - 1];
                }
            }