WPF 精修篇 窗体唯一（Single） 显示在最前

Posted 2021-03-21 lonelyxmas

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