C# 如果光标位置不在元素边框内，则禁用输入调用

我使用鼠标坐标（x&y）在windows上获取自动化元素

我想实现一个功能，如果用户光标位置不在元素Boundingrectangle内，则使用API user32.dll阻止输入调用，为此，我在下面编写了鼠标按下操作代码

[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
public static extern void BlockInput([In, MarshalAs(UnmanagedType.Bool)]bool fBlockIt);

[DllImport("User32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool GetCursorPos(ref POINT p);

private void HookManager_MouseDown(object sender, MouseEventArgs e)
        {
            POINT l_objPoint = new POINT();
            bool l_bretVal = GetCursorPos(ref l_objPoint);

          while (!m_bRect .Contains(l_objPoint.X, l_objPoint.Y)
          {
           BlockInput(true);
           break;
          }
       }

但上面的代码并没有按预期工作，即使用户光标不在automation元素boundingrectangle内，也需要用户单击

我还尝试了另一种使用定时器勾号的方法，请检查下面的代码，但这里没有正确捕获Automationelement

      private void OnHovering()
        {
            System.Windows.Forms.Timer _timerOnHover = new     System.Windows.Forms.Timer();
            _timerOnHover.Tick += new EventHandler(_timerOnHovering_Tick);
            _timerOnHover.Interval = 100;
            _timerOnHover.Start();

        }

        private void _timerOnHovering_Tick(object sender, EventArgs e)
        {
            POINT currentPoint = new POINT();
            bool l_bretVal = GetCursorPos(ref currentPoint);
            if (!l_bretVal)
            {
                return;
            }
                if (!m_bRect.Contains(currentPoint.X, currentPoint.Y && !ISmouseMove)

                {
                    BlockInput(true);
                }
                else
                {
                    BlockInput(false);
                }
            }               
        }

      private void OnHovering()
        {
            System.Windows.Forms.Timer _timerOnHover = new     System.Windows.Forms.Timer();
            _timerOnHover.Tick += new EventHandler(_timerOnHovering_Tick);
            _timerOnHover.Interval = 100;
            _timerOnHover.Start();

        }

        private void _timerOnHovering_Tick(object sender, EventArgs e)
        {
            POINT currentPoint = new POINT();
            bool l_bretVal = GetCursorPos(ref currentPoint);
            if (!l_bretVal)
            {
                return;
            }
                if (!m_bRect.Contains(currentPoint.X, currentPoint.Y && !ISmouseMove)

                {
                    BlockInput(true);
                }
                else
                {
                    BlockInput(false);
                }
            }               
        }