I have c# application that I am running, and then in some point application throws an error which is then catched, then app should end. And it ends, but console windows stays open...
I even checked in windows task manager, under applications tab, there is listed my console, but when I click go to process, there is no process of that application.
Thats weird... Application ended, process ended, but console stays on? How can I kill that console?
Edit: my code:
static class Program
{
static void Main()
{
try
{
//bunch of static methods from other static classes are being invoked
Setup.Driver.Close();//another static method
}
catch (Exception)
{
Setup.Driver.Close();
}
}
}
Second edit: Note: Process.Getprocess().Kill(), Application.Exit(), Environment.Exit() are not working for me, in windows task manager, there is no process left to kill, only console stays open!
Environment.Exit(0);
or
this.Close();
If you have threads running, you can try this brute force method before you call Exit:
using System.Diagnostics;
ProcessThreadCollection currentThreads = Process.GetCurrentProcess().Threads;
foreach (var thread in currentThreads)
{
thread.Interupt(); // If thread is waiting, stop waiting
// or
thread.Abort(); // Terminate thread immediately
// or
thread.IsBackGround = true;
}
Environment.Exit and Application.Exit
Environment.Exit() is cleaner.
http://geekswithblogs.net/mtreadwell/archive/2004/06/06/6123.aspx
Good morning,
is the console app not closing when you start it from Visual Studio with the debugger attached or is it also not closed when you launch it from the file system / without attached debugger?
When the debugger is attached, you will always see an 'Press ENTER to exit ...' (or similar message).
When talking about the task manager - do you see the *.vshost process in there?
If yes, this is 'required' by Visual Studio and is not your 'real' console application; you will always see a *.vshost process when launching executables from within Visual Studio.
Hope this helps
Your program is most likely linked to another process which keeps it open.
In my case, the process was chromedriver.
Check your processes and your code to see what you opened and what's still running in the background.
I was stuck with this issue too. Once I was done with the browser, I just used Driver.Close(); However, doing this still kept chromedriver running in the background. So instead I used Driver.Quit(); . Then I made sure to return; from the Main method.
Hope this helps!
Environment.Exit();
will this work?
Related
I'm trying to create simple console apps in VS 2013, C#. Win 7. Running in debug, the window closes immediately (no "Press any key..."). Running without debug, the window simply appears and hangs.
The only way out is to close the window, but then I get zombie processes which can only be shut down by rebooting.
I know this was a problem under 2008, but I thought it had been fixed. Ideas?
Console applications won't automatically wait around after execution completes. You have to add in a call to ReadKey() for that to happen.
static void Main(string[] args)
{
/* all your code goes here */
Console.WriteLine("Press any key ...");
Console.ReadKey();
}
Could you please elaborate on what the zombie processes are (via Task Manager) and maybe we can help identify them?
I am writing a simple C# console application in VS 2013 but the problem is that output screen flashes for a moment and disappears suddenly . I use the alternate way and write Console.Readline() method in the end and problem is fixed .So but i personally think that this is just a trick to stop the screen and not the proper way.So can anyone explain me the proper way of doing this ??
The program immediately closes because there's nothing stopping it from closing. Insert a breakpoint at return 0; or add Console.Read(); before return 0; to prevent the program from closing.
After you are done with your program, press Ctrl+F5 ( Run without
debugging). This will prompt before closing the window and this is
what you want.
Or use this line at the end
Console.ReadKey();
No, this is the correct way of doing it. Console.ReadLine() and Console.ReadKey() are a blocking statement: they halt the thread to wait for input before continueing. If you wouldn't do this the program would reach its end and thus exit the console.
In a larger console program you might have a while(running) loop instead and a GUI won't have this problem until its GUI thread is explicitly stopped (closing the window), but for a simple console app you can just use this 'trick'.
Yes, as long as you don't stop the application it keeps running and ends when done processing.
That's why you need the Console.ReadLine(), it stops processing and waits until you tell it to continue.
when you run the program in Debug mode if you do'nt have any BreakPoints or if .NET engine does not need to Read IO from user then it just finishes the excution without waiting anymore.
if you want to stop the execution at the end want to see the console screen you can either use any IO Read Statements as below:
Console.ReadLine();
Console.Read();
Console.ReadKey();
OR
You can run your program in without Debugging mode by simply pressing Ctrl+F5
I am making a windows-form which contains a console. now when the console is openend and i later close either the console or the form( automaticly closes console too ) The proces of the console stays online when i look inside the taskmanager.
How is this possible? and why is this happening?
And, when i call the console it somehow doesn't get updated. this means
when i make any changes in the console inside visual studio, than save, start the program. It still uses the version BEFORE the save.
How is this possible, and why is this happening?
thank you
EDIT:
I have a seperate project in my solution called "parts' this is the console. I start i using
Console = Process.Start(#"C:\Users\Krijn\Desktop\CarWorks\Parts\bin\Debug\Parts");
As aleady mentioned you start a new process. The new process is independent from the one starting it. You need to terminate the started process yourself, I would suggest something like this:
Process consoleProcess = Process.Start(#"C:\Users\Krijn\Desktop\CarWorks\Parts\bin\Debug\Parts");
// Do some stuff here...
if (!consoleProcess.HasExited)
{
// Terminate the process
consoleProcess.Kill();
}
// Wait until the process is really terminated.
consoleProcess.WaitForExit();
I have an application that imports data from Excel. However, when I run the winforms app and I intrupt the application, using System.Windows.Forms.Application.Exit(); I can still see the "MyAppName".vshost32.exe running in task manager.
When I exit the application in debug mode, the form closes, but the VS IDE is not "stopped".
How do I ensure the application ends correctly.
Your call to Application.Exit() is working fine. The MyAppName.vshost32.exe executable is a host for debugging purposes. It runs whilst you have a project open in Visual Studio, regardless of if there is an active debugging session.
Update: Ok, I misunderstood. The above is true, but you're probably having problems with hung threads in the background. You need to terminate your threads to make it close properly. Asher's answer covers this. If you're just trying to do a super-hacky quick-and-dirty kill, you can use the following (though I take no responsibility for side effects, since it's extremely hacky):
System.Diagnostics.Process.GetCurrentProcess().Kill();
The process doesn't terminate because it still has foreground threads running.
If you create threads in your application you need to mark them as background threads or make sure they terminate when you want the application to exit.
Have you tried the more brutal Environment.Exit() function?
Application.Exit() just sends a message saying to shutdown; if the message never gets processed (for whatever reason), the application will stay running indefinitely.
From the MSDN documentation of Application.Exit():
The Exit method stops all running message loops on all threads and closes all windows of the application. This method does not necessarily force the application to exit. The Exit method is typically called from within a message loop, and forces Run to return.
I had a similar problem caused by a third party tool that did not allow me to set the threads as Background. Polynomial had the right idea, but then syntax is like this:
System.Diagnostics.Process.GetCurrentProcess().Kill();
I've inherited some windows-mobile code that I've been bringing up-to-date. I've come across a weird bug, and I was hoping that even though a bit vague, maybe it will spark someone's memory:
Running the app (which is basically a glorified Forms app with P/Invoke gps code), I switch to the task manager, and close the app via End Task. Seems to exit fine (no errors and disappears from Task Manager). Unfortunately, the app refuses to start a second time until I reboot the phone or reinstall the CAB.
What's worse: this bug is reproducible on a HTC Diamond, but works fine (ie. can run again after EndTask) on an HTC HD2.
The only thing I can think of is some kind of timing race between a Dispose() and the Task Manager. Any ideas?
I'm also thinking of a workaround - I do have a working "Exit Application" routine that correctly cleans up the app; can I catch the EndTask event in the c# code in order to complete a proper cleanup?
Maybe I'm just missing the pain point... all ideas welcome :)
When you use TaskManager to close it, the following happens:
The app Form(s) are send a WM_CLOSE message
If, after a period of time, they are still running TerminateProcess is used.
If you have a worker thread running that does not exit, the process will often not fully terminate. This was really common in CF 1.0 where the IsBackground property for a thread didn't exist.
Since TaskManager only enumerates Form captions, if your forms are all closed, it will not show the app, even through the process is running. When you try to execute again, the shell detects that it's already running and simply swithes to the running (with no UI) process so it looks like nothing happened.
You can verify this behavior with Remote Process Viewer.
The solution is to fix your worker thread code to exit properly. Typically I use a boolean or a WaitHandle to signal that they should exit. Setting IsBackground to true should also happen for all threads that are created.
it's been a year since your question, but this might be the answer.
I had the same sort of problem. My app has MinimizeBox = False, this shows a small Ok in the right top corner of the form and is the only way to handle the Closing Event (the Cross with MinimizeBox = True doesn't raise ClosingEvent). In this event I cancel the closing and do some custom code and minimize the form so that it looks like the standard ‘Cross close thing’ behavior.
The problem is that on htc diamond, when you kill a task it raises the same closing event, and my code cancels it again. The weird thing is that in task manager the app has disappeared, but if you launch the original Microsoft task manager (/windows/taskmgr.exe) and in the menu select show processes, then you see your app still running. That’s why you can’t launch it again. Strangely on HD2 it has the same behavior with the closing event, but it seems to also force a brute kill on the app, so no problem.
The solution :
You just need a little bool to know if your app is on foreground or on background that you set to true in the form activate event and false on deactivate event. In the closing event, you cancel only if your app is in foreground you can run your special code, otherwise let the form close, it's a kill !!!
[DllImport("coredll.dll")]
static extern int ShowWindow(IntPtr hWnd, int nCmdShow);
const int SW_MINIMIZED = 6;
public static void MinimizeForm(IntPtr pFormHandle)
{
ShowWindow(pFormHandle,SW_MINIMIZED);
}
private bool m_IsFormVisible = false;
void m_MainForm_Deactivate(object sender, EventArgs e)
{
m_IsFormVisible = false;
}
void m_MainForm_Activated(object sender, EventArgs e)
{
m_IsFormVisible = true;
}
void m_MainForm_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
if (m_IsFormVisible)//very important !
{
e.Cancel = true;
//do something if you want
//minimize the form yourself
MinimizeForm(s_Instance.m_MainForm.Handle);
}
}
I don't know exactly what your problem is, but I find WinCE devices tend to only allow one instance of an application to run at once. This could mean that either TaskManager didn't clean up the application properly so it thinks it's still running and doesnt start another copy, OR, it might actually still be running.
Try put some code in your application that detects if it is already running.
Also try double check you are cleaning everything up properly when it exists, especially threads etc as the timing of windows shutting down your application may be different to you doing it manually.
Hope any of that helps