Question

My service code resided in OnStart() throws Exception(I) and service is stopped. I don’t know why is there any ex. thrown?.. This is my code:

public Service1()
{
    InitializeComponent();
}

Thread thread;

protected override void OnStart(string[] args)
{
    thread = new Thread(delegate()
    {
        string path = @"D:\levani\FolderListenerTest\ListenedFolder";
        FileSystemWatcher listener;
        listener = new FileSystemWatcher(path);
        listener.Created += new FileSystemEventHandler(listener_Created);
        listener.EnableRaisingEvents = true;
    });
    thread.Start();
}

public void listener_Created(object sender, FileSystemEventArgs e)
{
    File.Copy(e.FullPath, @"D:\levani\FolderListenerTest\CopiedFilesFolder\F" + e.Name);
}

protected override void OnStop()
{
    thread.Abort();
}

Log

Log Name:      Application
Source:        .NET Runtime
Date:          6/11/2012 5:33:27 PM
Event ID:      1026
Task Category: None
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      Levan-PC
Description:
Application: FolderListenerService.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.IO.IOException
Stack:
   at System.IO.__Error.WinIOError(Int32, System.String)
   at System.IO.File.InternalCopy(System.String, System.String, Boolean)
   at System.IO.File.Copy(System.String, System.String)
   at FolderListenerService.Service1.listener_Created(System.Object, System.IO.FileSystemEventArgs)
   at System.IO.FileSystemWatcher.OnCreated(System.IO.FileSystemEventArgs)
   at System.IO.FileSystemWatcher.NotifyFileSystemEventArgs(Int32, System.String)
   at System.IO.FileSystemWatcher.CompletionStatusChanged(UInt32, UInt32, System.Threading.NativeOverlapped*)
   at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32, UInt32, System.Threading.NativeOverlapped*)

Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name=".NET Runtime" />
    <EventID Qualifiers="0">1026</EventID>
    <Level>2</Level>
    <Task>0</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2012-06-11T14:33:27.000000000Z" />
    <EventRecordID>18314</EventRecordID>
    <Channel>Application</Channel>
    <Computer>Levan-PC</Computer>
    <Security />
  </System>
  <EventData>
    <Data>Application: FolderListenerService.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.IO.IOException
Stack:
   at System.IO.__Error.WinIOError(Int32, System.String)
   at System.IO.File.InternalCopy(System.String, System.String, Boolean)
   at System.IO.File.Copy(System.String, System.String)
   at FolderListenerService.Service1.listener_Created(System.Object, System.IO.FileSystemEventArgs)
   at System.IO.FileSystemWatcher.OnCreated(System.IO.FileSystemEventArgs)
   at System.IO.FileSystemWatcher.NotifyFileSystemEventArgs(Int32, System.String)
   at System.IO.FileSystemWatcher.CompletionStatusChanged(UInt32, UInt32, System.Threading.NativeOverlapped*)
   at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32, UInt32, System.Threading.NativeOverlapped*)
</Data>
  </EventData>
</Event>

Answer 1

It could be any number of reasons. See File.Copy() documentation, especially the Exceptions section that document all the exceptions that could be thrown.

You need to wrap your File.Copy() and catch any exceptions so you can react appropriately:

public void listener_Created(object sender, FileSystemEventArgs e)
{
    try
    {
        File.Copy(e.FullPath, @"D:\levani\FolderListenerTest\CopiedFilesFolder\F" + e.Name);
    }
    catch {FileNotFoundException e)
    { 
        //do something if file isn't there
    }
    catch {UnauthorizedAccessException e)
    { 
        //do something if invalid permissions
    }

    //etc 
}