How to Write log file with closing reason, when application forcefully closed.

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Hi All,

I have created Windows application.

Need to update the log file based on application closing.

I have called Log file function to update the reason in Form Closing event.

But, it shows an error message file is used by another process.

If i forcefully shut down the application, log file is not saving.

In Log file:
using (StreamWriter sw = File.AppendText(logFile))

Any help on this.

Thanks in advance.

Posted 4-Aug-14 0:00am

sdileep1

Updated 4-Aug-14 0:55am

v2

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Prasad Avunoori 4-Aug-14 7:32am

I think Threading concept could help you.

3 solutions

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Bernhard Hiller · Answer 1 · 2014-08-04T02:08:00

Solution 3

Quote:
file is used by another process.

And guess which application it is which uses that log file?
Well, of course, it's yours.
Use adifferent design: there must be only one class which writes to the log file, and call a public method of that class for adding an entry to the log file.

Posted 4-Aug-14 2:08am

Bernhard Hiller

A-s-h-l-e-y · Answer 2 · 2014-08-04T01:43:00

Solution 1

You need to run the log from a thread that didn't crash or capture the error and write to the log in a try .

C#

try
{
    //Your crashy code
}
catch (Exception)
{
    //write your log here
}

Posted 4-Aug-14 1:43am

A-s-h-l-e-y

Prasad Avunoori · Answer 3 · 2014-08-04T01:59:00

C#

private void ClosingForm_FormClosing_1(object sender, FormClosingEventArgs e)
       {

           Thread thread1 = new Thread(new ThreadStart(log));
           thread1.Start();


       }

       void log()
       {
           string path = System.Reflection.Assembly.GetExecutingAssembly().Location;
           string folderpath = System.IO.Path.GetDirectoryName(path);
           string logFilePath = folderpath + @"\log.txt";

           if (!System.IO.File.Exists(logFilePath))
           {
               System.IO.File.Create(logFilePath);
           }

           StreamWriter sw = new StreamWriter(logFilePath,true); //located in /bin/debug
           sw.WriteLine("Application closed accidentally at : "+System.DateTime.Now.ToString());
           sw.Close();

       }