/// <summary>
/// Advances the enumerator to the next element of the collection.
/// </summary>
/// <returns>
/// true if the enumerator was successfully advanced to the next element;
/// false if the enumerator has passed the end of the collection.
/// </returns>
/// <exception cref="T:System.InvalidOperationException">
/// The collection was modified after the enumerator was created.
/// </exception>
public bool MoveNext()
{
bool retval = false;
//If the handle is null, this is first call to MoveNext in the current
// directory. In that case, start a new search.
if (m_currentContext.SubdirectoriesToProcess == null)
{
if (m_hndFindFile == null)
{
new FileIOPermission(FileIOPermissionAccess.PathDiscovery, m_path).Demand();
string searchPath = Path.Combine(m_path, m_filter);
m_hndFindFile = FindFirstFile(searchPath, m_win_find_data);
retval = !m_hndFindFile.IsInvalid;
}
else
{
//Otherwise, find the next item.
retval = FindNextFile(m_hndFindFile, m_win_find_data);
}
}
//If the call to FindNextFile or FindFirstFile succeeded...
if (retval)
{
if (((FileAttributes)m_win_find_data.dwFileAttributes & FileAttributes.Directory) == FileAttributes.Directory)
{
//Ignore folders for now. We call MoveNext recursively here to
// move to the next item that FindNextFile will return.
return(MoveNext());
}
}
else if (m_searchOption == SearchOption.AllDirectories)
{
//SearchContext context = new SearchContext(m_hndFindFile, m_path);
//m_contextStack.Push(context);
//m_path = Path.Combine(m_path, m_win_find_data.cFileName);
//m_hndFindFile = null;
if (m_currentContext.SubdirectoriesToProcess == null)
{
string[] subDirectories = Directory.GetDirectories(m_path);
m_currentContext.SubdirectoriesToProcess = new Stack <string>(subDirectories);
}
if (m_currentContext.SubdirectoriesToProcess.Count > 0)
{
string subDir = m_currentContext.SubdirectoriesToProcess.Pop();
m_contextStack.Push(m_currentContext);
m_path = subDir;
m_hndFindFile = null;
m_currentContext = new SearchContext(m_path);
return(MoveNext());
}
//If there are no more files in this directory and we are
// in a sub directory, pop back up to the parent directory and
// continue the search from there.
if (m_contextStack.Count > 0)
{
m_currentContext = m_contextStack.Pop();
m_path = m_currentContext.Path;
if (m_hndFindFile != null)
{
m_hndFindFile.Close();
m_hndFindFile = null;
}
return(MoveNext());
}
}
return(retval);
}
/// <summary>
/// Sets the enumerator to its initial position, which is before the first element in the collection.
/// </summary>
/// <exception cref="T:System.InvalidOperationException">
/// The collection was modified after the enumerator was created.
/// </exception>
public void Reset()
{
m_hndFindFile = null;
}
private static extern bool FindNextFile(SafeFindHandle hndFindFile,
[In, Out, MarshalAs(UnmanagedType.LPStruct)] WIN32_FIND_DATA lpFindFileData);