WPF 精修篇 窗体唯一（Single） 显示在最前

原文:WPF 精修篇 窗体唯一（Single） 显示在最前

只运行一个窗体 并在一次点击时 显示到最前

发现用

SetForegroundWindow 并不是稳定的有效

最后使用 SetWindowPos

贴码了

   public const int HWND_TOPMOST = -1;





        public const int HWND_NOTOPMOST = -2;





        protected override void OnStartup(StartupEventArgs e)





        {





           





            bool isNewInstance;





            base.OnStartup(e);





            Mutex mutex = new Mutex(true, "Single", out isNewInstance);





            if (isNewInstance != true) 





            {





                IntPtr intPtr = FindWindowW(null, "Single");





                if (intPtr != IntPtr.Zero)





                {





                   





 





                    SetWindowPos(intPtr, HWND_TOPMOST, 0, 0, 0, 0, 1 | 2);





                    SetWindowPos(intPtr, HWND_NOTOPMOST, 0, 0, 0, 0, 1 | 2);





                    SetForegroundWindow(intPtr);





                   





                }





             





                Shutdown();





            }





        }





        [DllImport("User32", CharSet = CharSet.Unicode)]





        static extern IntPtr FindWindowW(String lpClassName, String lpWindowName);





        [DllImport("User32", CharSet = CharSet.Unicode)]





        static extern Boolean SetForegroundWindow(IntPtr hWnd); 





        [DllImport("user32.dll", CharSet = CharSet.Auto)] 





        private static extern int SetWindowPos(IntPtr hWnd, int hWndInsertAfter, int x, int y, int Width, int Height, int flags);





 





        [DllImport("user32.dll")]





        public static extern IntPtr SetFocus(IntPtr hWnd);

代码：

https://download.csdn.net/download/q465162770/12003540