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Application Exit Checking

Posted on 2006-11-25
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Last Modified: 2010-05-18
HI,
I am having an issue with a couple of methods in my program.

Is there a way I can check and see if any of these threads are running and if not the software goes by it without crashing?
   
EC0-EC270 are programs

EC4-EC7 are forms off of the main

    private void Form1_FormClosed(object sender, FormClosedEventArgs e)
        {
            if (EC0 != null)
                EC0.Kill();
            if (EC90 != null)
                EC90.Kill();
            if (EC180 != null)
                EC180.Kill();
            if (EC270 != null)
                EC270.Kill();
            if (ec4 != null)
                ec4.Close();
            if (ec5 != null)
                ec5.Close();
            if (ec6 != null)
                ec6.Close();
            if (ec7 != null)
                ec7.Close();
        }

        private void exitToolStripMenuItem_Click(object sender, EventArgs e)
        {
           
            if (EC0 != null)
                EC0.Kill();
            if (EC90 != null)
                EC90.Kill();
            if (EC180 != null)
                EC180.Kill();
            if (EC270 != null)
                EC270.Kill();
            if (ec4 != null)
                ec4.Close();
            if (ec5 != null)
                ec5.Close();
            if (ec6 != null)
                ec6.Close();
            if (ec7 != null)
                ec7.Close();

            Application.Exit();
        }

        private void resetApplicationToolStripMenuItem_Click(object sender, EventArgs e)
        {
           
            if (EC0 != null)
                EC0.Kill();
            if (EC90 != null)
                EC90.Kill();
            if (EC180 != null)
                EC180.Kill();
            if (EC270 != null)
                EC270.Kill();
            if (ec4 != null)
                ec4.Close();
            if (ec5 != null)
                ec5.Close();
            if (ec6 != null)
                ec6.Close();
            if (ec7 != null)
                ec7.Close();

            Application.Restart();
        }
0
Comment
Question by:schenkp
  • 2
  • 2
4 Comments
 
LVL 18

Expert Comment

by:Ravi Singh
ID: 18013080
Hi, not sure on what you exactly mean - can you explain further please? although, one modification that I would make is to encapsulate that common code into a seperate method so that you only need to change the code in one location in the future:

private void KillAndStuff()
{
            if (EC0 != null)
                EC0.Kill();
            if (EC90 != null)
                EC90.Kill();
            if (EC180 != null)
                EC180.Kill();
            if (EC270 != null)
                EC270.Kill();
            if (ec4 != null)
                ec4.Close();
            if (ec5 != null)
                ec5.Close();
            if (ec6 != null)
                ec6.Close();
            if (ec7 != null)
                ec7.Close();
}
0
 

Author Comment

by:schenkp
ID: 18014376
Hi Zepher,
ECO, EC90, EC180, and EC270 are real programs that get launched when the user click on a button on the main program.

There path is C:\program files\mysuff\ECO.exe, etc

EC4, EC5, EC6, and EC7 are all forms that get launched from the main program when a user click on the same button.

What happens is the user makes a choice and EC0, EC4, and EC90 are launched (for example) so now we have the main program, one form( EC4)  and 2 external programs (EC0, EC90) are running.   No i have a timer that executes and usess StuffandKill();  

EC0, EC4, and EC90 all close down they way they should, but after this if the user clicks on any of these methods

Appliation.Ext();
KillAndStuff()


Application.Rest();
KillAndStuff()

Form_closed();
KillAndStuff()


The application throws up and exception and says that EC0;

System.InvalidOperationException was unhandled
  Message="Cannot process request because the process has exited."
  Source="System"
  StackTrace:
       at System.Diagnostics.Process.GetProcessHandle(Int32 access, Boolean throwIfExited)
       at System.Diagnostics.Process.Kill()
       


So i was thinking that maybe the KillandStuff() methode needs a little error checking or something?



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LVL 18

Accepted Solution

by:
Ravi Singh earned 500 total points
ID: 18014400
Hi, thanks for clarifying... you can check if a process has exited by using the HasExited property, so your Kill() calls should only execute if the Process object is not null and the process has not already exited:

if (EC0 != null && !EC0.HasExited)
    EC0.Kill();
...

I don't think calling Close() on an already closed or disposed Form object should cause a problem...
0
 

Author Comment

by:schenkp
ID: 18014541
Thanks,

Works great:)
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