FirstFloor.ModernUI.Windows.Controls.DpiAwareWindow.BringToFront C# (CSharp) Method

        public void BringToFront() {
            if (!IsVisible) {
                Show();
            }

            if (WindowState == WindowState.Minimized) {
                WindowState = WindowState.Normal;
            }

            Topmost = true;
            Topmost = false;
            Focus();
        }
    }

        public static void HandleSecondInstanceMessages(DpiAwareWindow window, Action<IEnumerable<string>> handler) {
            HwndSource hwnd = null;
            HwndSourceHook hook = (IntPtr handle, int message, IntPtr wParam, IntPtr lParam, ref bool handled) => {
                if (message == SecondInstanceMessage) {
                    try {
                        handler(ReceiveSomeData());
                        window.BringToFront();
                    } catch (Exception e) {
                        Logging.Warning("Can’t handle message: " + e);
                    }
                }

                return IntPtr.Zero;
            };

            RoutedEventHandler[] handlers = { null, null };

            // loaded
            handlers[0] = (sender, args) => {
                window.Loaded -= handlers[0];

                try {
                    hwnd = HwndSource.FromHwnd(new WindowInteropHelper(window).Handle);
                    if (hwnd == null) {
                        Logging.Warning("Can’t add one-instance hook: HwndSource is null");
                        return;
                    }

                    hwnd.AddHook(hook);
                    window.Unloaded += handlers[1];
                } catch (Exception e) {
                    Logging.Warning("Can’t add one-instance hook: " + e);
                    hook = null;
                }
            };
            
            // unloaded
            handlers[1] = (sender, args) => {
                window.Unloaded -= handlers[1];

                try {
                    hwnd.RemoveHook(hook);
                } catch (Exception e) {
                    Logging.Warning("Can’t remove one-instance hook: " + e);
                    hook = null;
                }
            };

            if (!window.IsLoaded) {
                window.Loaded += handlers[0];
            } else {
                handlers[0](null, null);
            }
        }