限制鼠标活动区域

        private void button1_Click(object sender, EventArgs e)
        {
            this.Cursor = new Cursor(Cursor.Current.Handle);                    //创建Cursor对象
            Cursor.Position = new Point(Cursor.Position.X,Cursor.Position.Y);   //设置鼠标位置
            Cursor.Clip = new Rectangle(this.Location,this.Size);               //设置活动区域
        }

        private void button2_Click(object sender, EventArgs e)
        {
            this.Cursor = new Cursor(Cursor.Current.Handle);
            Screen[] screen = Screen.AllScreens;                                //获取显示的数组 
            Cursor.Clip= screen[0].Bounds;                                      //解除活动区域的限制
        }