This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
C# Sharp Windows Application prevents Windows from shutting down / logging off
I want to write code for automatically exit from my application when user shutdowns the computer. I have done the project in C# developer.
Now I can't shutdown the computer without manually exiting the application.
Please advice.
You may use SystemEvents class described in below link :-
http://msdn.microsoft.com/en-us/library/microsoft.win32.systemevents.aspx
Subscribe to SessionEnded event which triggers when User logs off or shut down system.
you may write a code in this event to terminate the application by itself.
for eg. Application.Exit() closes the application.
You can use the SystemEvents. Just subscribe to SessionEnded and perform any closing operation you want for your application.
Word of Caution : I think you wont get enough time there to perform any complex task. But since you just want to exit from your application, just call Application.Exit() in the event handler.
Related
I want to delete my img what i made, when my program is ended.
(It means when user click the exit button.)
Click this button.
Or, when user click the exit button, then I want to show the popup window.
So User can save their img before the program is ended.
But I couldn't find that way.
Is this impossible way?
Please tell me anything!! Thanks for reading this.
See the accepted answer of this question.
And to understand more how you can incorporte this in your application you can also refer to this blog post.
Basically you need 2 aspects to achieve this:
confirmAppClose restricted capability.
a n event to handle the app closing. SystemNavigationManagerPreview.GetForCurrentView().CloseRequested
Take a look at application lifecycle article. You shouldn't add blocking code to the app suspended event. You need to silently save its state and restore state once your app gets back to active state as if it was not closed at all.
Regarding close button from ms docs:
There is not an event to indicate that the user closed the app. When
an app is closed by the user, it is first suspended to give you an
opportunity to save its state. In Windows 8.1 and later, after an app
has been closed by the user, the app is removed from the screen and
switch list but not explicitly terminated.
Closed-by-user behavior: If your app needs to do something different
when it is closed by the user than when it is closed by Windows, you
can use the activation event handler to determine whether the app was
terminated by the user or by Windows. See the descriptions of
ClosedByUser and Terminated states in the reference for the
ApplicationExecutionState enumeration.
This question already has answers here:
How to do something before process get killed in windows
(3 answers)
Closed 5 years ago.
Is there anything I can do with my program wherein I have to do something when my application has been terminated using task manager?
I hope you can help me in this matter.
Thank you!
You can´t do this because the applications process is forcefully closed (killed). Events only happen if the application is asked to end e.g. call Close() or Exit().
If you need to do something when this happens implement a different app that monitors your app to take actions e.g. restart app or close another app.
I have a windows application that shells an outside application (.exe). What i want to achieve, is when the user terminates my windows application thru task manager, the shelled outside application should also be terminated.
As pointed out by others, you simply cannot do this, because when a process is killed, it receives no events at all. What you can do, however, if this requirement is super important, that you deploy a second program, which is a windows service, that monitors your windows app and shuts down the shelled application whenever it finds that your app is not running any more.
This question already has answers here:
How to detect Windows shutdown or logoff
(3 answers)
Closed 6 years ago.
I am working on a WPF application that should store its window state (normal / minimized) - even if the system is shutting down or loggin off.
The WindowClosing event is used to store the state. The problem is, that shutdown/log off enforces the window to close. Therefore, the window state is always minimized after reboot.
Is there a safe way to check if the system is shutting down? (I tried Environment.HasShutdownStarted, but id didnt work).
Is there a way to get notified about window state changes other than the WindowClosing event?
[Edit]
The answers of the question, marked as dublicate, are not satisfying:
SystemEvents.SessionEnding is not a proper solution because the msdn says: "If you are using SessionEnding in a Windows form to detect a system logoff or reboot, there is no deterministic way to decide whether the Closing event will fire before this event."
GetSystemMetrics(SM_SHUTTINGDOWN) may work (i didn't test it), but it requires PInvoke and I prefer a managed solution.
So finally, the suggestion from d.moncada (using the Application.SessionEnding event) is the the best solution for my problem.
Is there a safe way to check if the system is shutting down? (I tried
Environment.HasShutdownStarted, but id didnt work).
Do you want to know when the system (computer) is shutting down, or the application?
If it's the application, you can use Window.Closing event.
See here.
If it's for the system, you can listen to the Application.SessionEnding event.
See here.
Is there a way to get notified about window state changes other than
the WindowClosing event?
Have you taken a look at the StateChanged event of the Window?
More info, see here
I want to get event when windows store app is closing or page is closing same way as we get "Closing" event in Desktop application.
Can anybody suggest me?
Try this:- https://msdn.microsoft.com/en-us/library/windows/apps/hh986968.aspx
refer:- How to save data on Windows Store App Close?
If you look at the very first figure, you can see that there are only 3 events related to application lifecycle:
Activated - Raised when program first starts
Suspended - Raised when program is suspended (i.e. the user returns to the Start Screen or another app)
Resuming - Raised when the program is awakened from its suspended state.
The fourth transition - the one to the "Not Running" state - has no such notification event. The reason is: you don't really know when the app will fully close. Nor should you - Microsoft wants you to perform all of your state-saving logic in the transition from "Running" to "Suspended." In this way, they can free up resources when they deem necessary.
Even if the user forces the program to terminate (by right-clicking it and selecting "Close" from the task menu), you will enter the "Suspended" state for exactly 10 seconds before the program is terminated. So you can rest easy that your state-saving logic will always be executed.
This question already has answers here:
Keep window on top and steal focus in WinForms
(5 answers)
Closed 9 years ago.
I'm developing a simple program that reads a card or a barcode and logs that on a database. Before, I developed the same application in Visual Basic and it was working great, but due to a lot of changes on our servers, we decided to develop this app in C#.
I can get my application to start with Windows putting its shortcut on 'startup' of the start menu but the problem is that its not getting focus so that the cards and barcodes can be read and that way my program is simply useless. The machines we use are running Windows XP and Windows 7.
How is the best way to start my application on Windows Startup and keep the focus in it?
This is, in general, a pretty bad design. I just finished a project involving barcode readers and set them up to act as serial ports, instead of keyboards. You should check whether this is an option with your hardware, as the end result will be much more reliable.
That being said, you can create a timer in your form that executes this.Focus() and this.BringToFront() to steal focus. Be aware that this will, by default, only cause the task bar to flash. You'll need to use TweakUI to enable focus stealing.
Another option is discussed here on SO. Very similar question, actually. Basically, you hook the keyboard input at a low level.
Please try and find another way, monitor system events or use a polling mechanism.
Stealing focus should be avoided, read this to understand why
If I had a dollar for every time I typed a password, cleartext in the wrong application because it stole focus...
On Form Activated Event call This.SentToBack()