I am using windows forms application, which runs from system tray. In ContextMenuStrip I have an Exit icon, which should be terminating my process, but it doesn't.
My process stays in task manager. So, if I run (and terminate) the applicaiton several times, then I have several processes in task manager, although none of them is reachable any more.
My code for exiting application is simple:
void exitOnClick(object sender, System.EventArgs e)
{
_notifyIcon.Visible = false;
Application.Exit();
}
I've checked with debugger - this code is triggered when I press Exit. Notify icon dissapears, but process remains in task manager. Also, if any of win forms are open, they are closed.
Try to use Environment.Exit static method. This method:
... terminates an application immediately, even if other threads are
running.
But it's better to find a code that is still running, as you was told above.
Related
I have a question, I created an application on visual studio using C# and Window Forms, but every time it runs, if the application close (either manually by the person or when it reach the end) it continue running on the process of the computer, so if I open and close the application 3 times there will be 3 processes with the same name activated. How can I prevent that from happening? So far the only way for me to close it is going to Window Task Manager and closing it manually, which is a pain...
Any ideas?
if you want to kill all processes and exit from application then first you need to kill threads in background
Application.ExitThread();
and then exit from application
Environment.Exit();
You can use Saif's answer which forces background threads to abort, but I'd recommend you manage your threads better. If you have threads that run for an extended period of time, you should have a flag (a boolean that can be accessed from anywhere in your code) that tells the threads they should stop running. This is a safer method than
Application.ExitThread();
because it allows you to flush and close streams, disconnect your socket connections or tidy up whatever you're doing in your threads.
Well, based on this problem you can check if your application is running on your application startup. That way you only start the process if it is not running:
I´m going to check for example notepad:
Process[] pname = Process.GetProcessesByName("notepad");
if (pname.Length == 0)
{
//The application is not running. Start your process here
}
else
{
//Your application is running. Do nothing
}
When trying to press the standard Windows 7 logoff button while my WPF app is running, I get "This program is preventing Windows from logging off". I would like to force it to close without having to press "Force log off".
Similarly, pressing "End Task" in the (applications) Task Manager causes it to become non-responsive rather than just close the program.
I have tried adding this to Window_Closing, but this doesn't seem to do it:
private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
Environment.Exit(0);
}
I'm new to WPF, but it seems to me that the window is not closing properly. How can I prevent the "program is preventing Windows from logging off" when executing the Windows logoff, or "Program is not responding" when killing it from task manager?
This should only be an issue if your application is not responding to the close events sent from Windows.
This will typically happen if you are executing code on the UI thread, which prevents it from responding to messages. As such, putting something in the closing events and similar will have no effect, as they won't be able to process until after your "work" finishes.
The proper way to handle this is to move your work onto background threads. This keeps the application responsive, which allows it to respond to the request from Windows to Close.
I have just built version one of my testing application using Windows Forms. I have noticed that when running the application, it runs completely fine no hitches, exactly like the debug view. When it comes to closing the application I have noticed that the actual executable/process name hangs within Task manager and does not correctly close.
Upon further inspection I have noticed that when calling another form without hiding the previous form, a new process is spawned (kinda expected). When closing the new form (containing a few text boxes, labels and a DataGridView) the newly spawned process does not kill it's self, but remains. Then closing the main window the window disappears from the taskbar/view, but still, the processes remain active using 8,268k - 8,308k Memory
private void ClientSearch_Click(object sender, EventArgs e)
{
ClientSearch Clientsearch = new ClientSearch();
Clientsearch.Show();
}
Standard explanations for this behavior:
Hiding your main window when you display another window and forgetting to unhide it. There is no visible window anymore, nor can the user do anything to unhide it, but your app keeps motoring of course.
Starting a thread and not making sure that it is terminated when the main window closes. Setting the thread's IsBackground property to true is a workaround for that.
Calling Application.DoEvents() in your code. A very dangerous method that permits you to close the user interface but doesn't stop the loop in which it was called so the main thread of your app does not exit either.
This kind of problem is readily visible as well when you debug your app. You might have gotten in the habit of using the red rectangle on the toolbar (aka Debug + Stop Debugging) to force the debugger to quit. The Debug + Windows + Threads debugger window can provide insight into the cause of the last two bullets. Or you can use Tools + Attach to Process to attach the debugger to a zombie process.
Call
Application.Exit();
on form close/closing.
Your applications should only be creating one process per run. A new form should not be creating a new process.
I have an application that is automatically shut down when a certain event occurs.
When the application is shut down this way the very last thing my application does is to tell Windows to shut down as well.
The shutdown of Windows is done by calling the following:
private void OnProcessExit(object sender, EventArgs e)
{
//If class level flag set shut down Windows with a delay of xx seconds
if (shutdownWindowsOnExit)
System.Diagnostics.Process.Start("shutdown", "/s /t 30");
}
The user must be able to cancel the shutdown of Windows after my application has shut down, which is why the delay of 30 seconds is defined.
To accomplish this I just placed a regular shortcut on the desktop, which then called the following when pressed (cancels Windows shutdown):
C:\Windows\System32\shutdown.exe /a
What I want is to get rid of the shortcut and implement the canceling code in something that appears (for the user) to belong to my application (that has just been closed).
I have considered to simply create a small separate application which would consist of a form with a button stating "Press here to cancel Windows shutdown".
I could then start this small application from my main application right after calling
System.Diagnostics.Process.Start("shutdown", "/s /t 30");
This way I would be very sure that my main application was safely shutdown, and that only the small auxilary application would be terminated by Windows upon Windows shutdown.
I know that one can comprise two projects in one solution in Visual Studio, but it feels a bit overkill to create a separate project (with settings.settings file, app.config file, version control etc.) to create this little auxilary program.
My question now is:
Can I in some way code and compile this separate form to a separate .exe file within my existing project in Visual Studio, without the need of two complete separate projects in one solution.
Thanks for any help in advance!
Why not do the following flow :
Perform all needed shutdown processes (minus killing the app),
Close the main form and open new form with a timer and a cancel button
When timer is up kill the application and shutdown windows
If the user cancels kill the application but do not shutdown windows
when terminating the application ensure no background threads are still running to avoid
"The application was not shut down properly"
In my application, which using another application (run in tray) to print receipts I need to do those three things:
Open process when on mainApplication startup
Close process when mainApplication closing or changing any information about printer
Keep process alive, if it get any error
First point is quiet easy, I just simply
Process.Start("_ReceiptPrinter.exe");
And process working ;)
But now, the two other issues:
Closing process. I've tried this code:
Process[] allProcs = Process.GetProcesses();
foreach (Process proc in allProcs)
{
ProcessThreadCollection myThreads = proc.Threads;
if (proc.ProcessName == "_ReceiptPrinter")
{
proc.Close();
}
}
Unfortunately, I can still see icon in tray, and process is still running.
Keep process alive. My main application is in WPF, that one from tray is written on WinForms. Maybe there is any way to handle ANY WinForm application exit event (well, any, but not this one, which just simply close it from another application), and reopen it?
proc.Close() asks it to close but there is no guarantee. Use:
proc.Kill();
The reason you still see a tray icon is that the icons are cached by an external process (windows explorer.)
The reason process.Close() does not close the application is because the application is not processing window messages (as this call simulates a WM_CLOSE request, per classic Windows API.)
The proper way to close the application is process.Close, not process.Kill(), further, as part of app/window close you need to unregister any tray icons you've registered with the system. This way any normal closure of your application will properly clean-up the tray.
Further, you can use a "critical finalizer" which would be guaranteed to run before application exit, except in total catastrophe scenarios.