Environment.HasShutdownStarted property in C#

Thomas Mapother

Hi,

I want to create an application which works when system is shutting down. So, my question is that is it right way to implement Environment.HasShutdownStarted property for my propose..?

SystemEvents.SessionEnding +=
   new SessionEndingEventHandler(SystemEvents_SessionEnding);

  void SystemEvents_SessionEnding(object sender, SessionEndingEventArgs e)
  {
   if (Environment.HasShutdownStarted)
   {
   //…………………………
   }
   else
   {
   //………………
   }
   }

4 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vulpes15y ago
Accepted answer
Well, strictly speaking, the Environment.HasShutdownStarted property tells you when the CLR is shutting down which may not necessarily be because the system as a whole is shutting down. This property also has some issues as Zoran said.

To detect that the system is shutting down, I'd use (as long as it's not a console application):

void SystemEvents_SessionEnding(object sender, SessionEndingEventArgs e)
{
if (e.Reason == SessionEndReasons.SystemShutdown)
{
// ...
}
else
{
// ...
}
}
Thomas Mapother15y ago
Okay Sam I got it......
Sam Hobbs15y ago
.Net does not suuport much system-level stuff. A system-wide shutdown is definitely a system-wide event. So I would process the WM_ENDSESSION Message.

Note that your question is not a C# language question. I am not sure what forum would be most appropriate but you really should specify what type of program this is for. Assuming this is a Windows Forms application, you can override the Form.WndProc Method. In a console application you can probably use the IMessageFilter Interface but you will need to do something, such as create a form, to create a message loop.

Okay?
Zoran Horvat15y ago
It might be right but be very careful with this property. It typically goes along with shutting down the IIS, shutting down the application domain, etc. When AppDomain is being shut, object start disappearing in front of you so your class might be incomplete. You can test this condition using AppDomain.IsFinalizingForUnload() method.

You should test your application very carefully because applications probably often see ghosts in MS operating systems when system is shutting down.

Zoran