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 System;
 System.Collections.Generic;
 System.IO;
 System.Threading;
 Utility
{
      DelayFileSystemWatcher
    {
          Timer m_Timer;
          Int32 m_TimerInterval;
          FileSystemWatcher m_FileSystemWatcher;
          FileSystemEventHandler m_FileSystemEventHandler;
          Dictionary<String, FileSystemEventArgs> m_ChangedFiles =  Dictionary<, FileSystemEventArgs>();
         DelayFileSystemWatcher( path,  filter, FileSystemEventHandler watchHandler,  timerInterval)
        {
            m_Timer =  Timer(OnTimer, , Timeout.Infinite, Timeout.Infinite);
            m_FileSystemWatcher =  FileSystemWatcher(path, filter);
            m_FileSystemWatcher.NotifyFilter = NotifyFilters.FileName | NotifyFilters.LastWrite | NotifyFilters.CreationTime;
            m_FileSystemWatcher.Created += fileSystemWatcher_Changed;
            m_FileSystemWatcher.Changed += fileSystemWatcher_Changed;
            m_FileSystemWatcher.Deleted += fileSystemWatcher_Changed;
            m_FileSystemWatcher.Renamed += fileSystemWatcher_Changed;
            m_FileSystemWatcher.EnableRaisingEvents = ;
            m_FileSystemEventHandler = watchHandler;
            m_TimerInterval = timerInterval;
        }
          fileSystemWatcher_Changed( sender, FileSystemEventArgs e)
        {
             (m_ChangedFiles)
            {
                 (!m_ChangedFiles.ContainsKey(e.Name))
                {
                    m_ChangedFiles.Add(e.Name, e);
                }
            }
            m_Timer.Change(m_TimerInterval, Timeout.Infinite);
        }
          OnTimer( state)
        {
            Dictionary<String, FileSystemEventArgs> tempChangedFiles =  Dictionary<String, FileSystemEventArgs>();
             (m_ChangedFiles)
            {
                 (KeyValuePair<, FileSystemEventArgs> changedFile  m_ChangedFiles)
                {
                    tempChangedFiles.Add(changedFile.Key, changedFile.Value);
                }
                m_ChangedFiles.Clear();
            }
             (KeyValuePair<, FileSystemEventArgs> changedFile  tempChangedFiles)
            {
                m_FileSystemEventHandler(, changedFile.Value);
            }
        }
    }

        s_DelayFileSystemWatcher = new DelayFileSystemWatcher(@"C:\Temp", "*.xml", fileSystemWatcher_Changed, 1500);
 
         private static void fileSystemWatcher_Changed(object sender, FileSystemEventArgs e)
         {
             switch (e.ChangeType)
             {
                 case WatcherChangeTypes.Created:
                     //TODO
                     break;
                 case WatcherChangeTypes.Deleted:
                     //TODO                        
                     break;
                 case WatcherChangeTypes.Changed:
                     //TODO
                     break;
                 default:
                     break;
             }
         }