internal void UpdateState(string directory, ref FileChangeList changes, ref FileSystemEntry file)
{
int index = _state.IndexOf(directory, file.FileName);
if (index == -1) // file added
{
string path = file.FileName.ToString();
changes.AddAdded(directory, path.ToString());
var newFileState = new FileState(directory, path);
newFileState.LastWriteTimeUtc = file.LastWriteTimeUtc;
newFileState.Length = file.Length;
newFileState._version = _version;
_state.Add(directory, path, newFileState);
return;
}
_state.Values[index]._version = _version;
FileState previousState = _state.Values[index];
if (file.LastWriteTimeUtc != previousState.LastWriteTimeUtc || file.Length != previousState.Length)
{
changes.AddChanged(directory, previousState.Path);
_state.Values[index].LastWriteTimeUtc = file.LastWriteTimeUtc;
_state.Values[index].Length = file.Length;
}
}
private void TimerHandler(object context)
{
try
{
FileChangeList changes = ComputeChangesAndUpdateState();
if (!changes.IsEmpty)
{
Changed?.Invoke(this, EventArgs.Empty);
ChangedDetailed?.Invoke(this, new PollingFileSystemEventArgs(changes.ToArray()));
}
}
catch (Exception e)
{
Error?.Invoke(this, new ErrorEventArgs(e));
}
if (!_disposed)
{
_timer.Change(PollingInterval, Timeout.Infinite);
}
}
// This function walks all watched files, collects changes, and updates state
private FileChangeList ComputeChangesAndUpdateState()
{
_version++;
var enumerator = new FileSystemChangeEnumerator(this, Path, EnumerationOptions);
while (enumerator.MoveNext())
{
// Ignore `.Current`
}
FileChangeList changes = enumerator.Changes;
foreach (FileState value in _state)
{
if (value._version != _version)
{
changes.AddRemoved(value.Directory, value.Path);
_state.Remove(value.Directory, value.Path);
}
}
return(changes);
}