SetWindowPos不能置顶的问题

[cwf673452719]

 public static readonly IntPtr HWND_TOPMOST = new IntPtr(-1);    //窗体置顶
        public static readonly IntPtr HWND_NOTOPMOST = new IntPtr(-2);    //取消窗体置顶
        public const uint SWP_NOMOVE = 0x0002;    //不调整窗体位置
        public const uint SWP_NOSIZE = 0x0001;    //不调整窗体大小
public static bool setTopChildWin()
        {
            IntPtr ChildWin = FindWindow(null, "MessageTip");    // 窗口类型WpfApplication1 窗口主题Tip
            int childwin = (int)ChildWin;
            if (childwin != 0)
            {

                SetWindowPos(ChildWin, MainWindow.HWND_TOPMOST, 0, 0, 0, 0, MainWindow.SWP_NOMOVE | MainWindow.SWP_NOSIZE);
                return true;
            }
            return false;
        }

写的是一个定时提醒的小工具，定时器新建窗口并置顶，但是我如果在任务栏反复点这个窗口，使其多次显示-隐藏后，这个置顶方法就不能再是窗口置顶了。

[xuyufeng822]

不用调用API吧， frm1.TopMost = true 就可以了，在定时器里写，时刻 保持最前。 但是如果有多个在最前的窗体要注意哪个活动，哪个就暂时在最前

[cwf673452719]

TopMost = true 也是一样的

  private void timer_method()
        
        {
            if (_ckbtextstatus == true)
            {

                //查找窗口并置顶
                System.Windows.Application.Current.Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority.Normal,
                       new delegate_setTopChildWin(setTopChildWin));
               
                
                if (_settop == false)
                {
                    System.Windows.Application.Current.Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority.Normal,
                        new delegate_messagetip(messagetip));
                    
                    
                }
            }
        }

 private delegate void delegate_setTopChildWin();
        /// <summary>
        /// 窗口置顶
        /// </summary>
        /// <returns></returns>
        private void setTopChildWin()
        {
            IntPtr ChildWin = FindWindow(null, "MessageTip");    // 窗口类型WpfApplication1 窗口主题Tip
            IntPtr ChildWin1 = FindWindow("TimeTipAPP", null);
            IntPtr ChildWin2 = FindWindow("APPMessage", null);
            int childwin = (int)ChildWin;
            if (childwin != 0 && _messagewin!=null)
            {

                //SetWindowPos(ChildWin, MainWindow.HWND_TOPMOST, 0, 0, 0, 0, MainWindow.SWP_NOMOVE | MainWindow.SWP_NOSIZE);
                _messagewin.Topmost = true;
                _settop = true;
                return ;
                
            }
            _settop = false;
            return ;
        }

 /// <summary>
        /// 提醒弹窗委托
        /// </summary>
        /// <returns></returns>
        private delegate void delegate_messagetip();
        private void messagetip()
        {
            _parentWin = Window.GetWindow(this);

            _messagewin = new APPMessage(_textmessage);
            _messagewin.Owner = _parentWin;
            hide();
            _messagewin.Show();
            setTopChildWin();
               
        }

主要在新弹出窗口移动并关闭后，定时器再次执行到 //查找窗口并置顶 System.Windows.Application.Current.Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority.Normal, new delegate_setTopChildWin(setTopChildWin));这个句就卡主了