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    <p>if I had to do something similar I would have done it this way:</p> <pre><code>public class Watcher { public readonly TimeSpan Timeout = TimeSpan.FromMinutes(10); private readonly FileSystemWatcher m_SystemWatcher; private readonly Queue&lt;FileItem&gt; m_Files; private readonly Thread m_Thread; private readonly object m_SyncObject = new object(); public Watcher() { m_Files = new Queue&lt;FileItem&gt;(); m_SystemWatcher = new FileSystemWatcher(); m_SystemWatcher.Created += (sender, e) =&gt; WatcherHandler(e.FullPath); m_Thread = new Thread(ThreadProc) { IsBackground = true }; m_Thread.Start(); } private void WatcherHandler(string fullPath) { lock (m_SyncObject) { m_Files.Enqueue(new FileItem(fullPath)); } } private void ThreadProc() { while(true)//cancellation logic needed { FileItem item = null; lock (m_SyncObject) { if (m_Files.Count &gt; 0) { item = m_Files.Dequeue(); } } if (item != null) { CheckAccessAndProcess(item); } else { SpinWait.SpinUntil(() =&gt; m_Files.Count &gt; 0, 200); } } } private void CheckAccessAndProcess(FileItem item) { if (CheckAccess(item)) { Process(item); } else { if (DateTime.Now - item.FirstCheck &lt; Timeout) { lock (m_SyncObject) { m_Files.Enqueue(item); } } } } private bool CheckAccess(FileItem item) { if (IsFileLocked(item.Path)) { if (item.FirstCheck == DateTime.MinValue) { item.SetFirstCheckDateTime(DateTime.Now); } return false; } return true; } private void Process(FileItem item) { //Do process stuff } private bool IsFileLocked(string file) { FileStream stream = null; var fileInfo = new FileInfo(file); try { stream = fileInfo.Open(FileMode.Open, FileAccess.ReadWrite, FileShare.None); } catch (IOException) { return true; } finally { if (stream != null) stream.Close(); } return false; } } public class FileItem { public FileItem(string path) { Path = path; FirstCheck = DateTime.MinValue; } public string Path { get; private set; } public DateTime FirstCheck { get; private set; } public void SetFirstCheckDateTime(DateTime now) { FirstCheck = now; } } </code></pre> <p>From CheckAccess and IsFileLocked you may return FileStream object to ensure that file handle will be not obtained from another process between CheckAccess and Process calls;</p>
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    1. USAndriy Vandych
    1. USAndriy Vandych
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