我在网上找的贪吃蛇案例，为什么我在创建事例b是说P是变量无法使用，我改如何改进
private void Move()
{
Point p;
Block head = (Block)(this._blocks[0]);
if (this._direction == Direction.Up)
p = new Point(head.Point.X, head.Point.Y - 1);
else if (this._direction == Direction.Down)
p = new Point(head.Point.X, head.Point.Y + 1);
else if (this._direction == Direction.Left)
p = new Point(head.Point.X - 1, head.Point.Y);
else if (this._direction == Direction.Right)
p = new Point(head.Point.X + 1, head.Point.Y);
Block b = new Block(Color.Red, this._size, p);//mmmmmmmmm
if (this._food.Point != p)
this._blocks.RemoveAt(this._blocks.Count - 1);
else
this._food = this.GetFood();
this._blocks.Insert(0, b);
this.PaintPalette(this._gpPalette);

}
[解决办法]
try

Point p = Point.Empty;

[解决办法]
p定义时要初始化一个值
如：
Point p = new Point(0,0);
或
Point p = Point.Empty;
[解决办法]
我的意思是
else if (this._direction == Direction.Right)
p = new Point(head.Point.X + 1, head.Point.Y);
这个改成
else
p = new Point(head.Point.X + 1, head.Point.Y);
怎么能没有呢？
[解决办法]

引用:

我的意思是
else if (this._direction == Direction.Right)
p = new Point(head.Point.X + 1, head.Point.Y);
这个改成
else
p = new Point(head.Point.X + 1, head.Point.Y);
怎么能没有呢？

这个应该是正确的，
话说这段代码很像是我很久之前传的一个贪吃蛇例子呢。
是不是从这个地址下的？
http://download.csdn.net/detail/aley/969799