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I have a wpf application on .net 4.8. If i close the app i use MainWindow.Hide() to bring it in Systemtray and to minimize the app. But if a user starts a new instance of the app it should be bring to foreground the minimized app. For this I use this pice of code:

var currentProcess = System.Diagnostics.Process.GetCurrentProcess();
            var runningProcesses = Process.GetProcesses().FirstOrDefault(p => p.ProcessName == currentProcess.ProcessName && p.Id != currentProcess.Id);

            if (runningProcesses != null)
            {
                var window = runningProcesses.MainWindowHandle;

                ShowWindowAsync(window, 1); //SW_SHOWNORMAL
                SetForegroundWindow(window);

                this.Close();
            }

If the app is only minimized it works perfekt. If it is hided (Systemtray) the MainWindowHandle is always 0. I have noticed that if I hide the app it goes from apps section to the background process section in the taskmanager. Is there a way to avoid this action or is there a way to bring it in foreground? Thanks

cpiock
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1 Answers1

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you can use FindWindow api to find MainWindow handle. then you can bring it to foreground.

[DllImport("user32.dll")]
public static extern IntPtr FindWindow(string lpClassName,string lpWindowName);

var mainWindowHandle = FindWindow("","MainWindow"); //Suppose your window name is MainWindow
ShowWindowAsync(mainWindowHandle , 1); //SW_SHOWNORMAL
SetForegroundWindow(mainWindowHandle );
sync
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