IEnumerable <TResult> EnumerateFiles <TResult>(string path, string pattern, bool recursive, IFindResultHandler <TResult> findResultHandler, bool caseSensitive)
{
string filename = Path.Combine(path, pattern);
Win32FindData findData = new Win32FindData();
SearchAdditionalFlags flags = SearchAdditionalFlags.LargeFetch;
if (caseSensitive)
{
flags |= SearchAdditionalFlags.CaseSensitive;
}
List <string> directories = null;
if (recursive)
{
directories = new List <string>();
}
using (SafeFindHandle findHandle = FindFirstFileEx(filename, FIndexInfoLevels.Basic, findData, FIndexSearchOps.NameMatch, IntPtr.Zero, flags))
{
bool ok = !findHandle.IsInvalid;
while (ok)
{
if (findResultHandler.IsResultOK(path, findData))
{
yield return(findResultHandler.GetResult(path, findData));
}
if (recursive && (findData.FileAttributes & FileAttributes.Directory) != 0)
{
directories.Add(findData.FileName);
}
ok = FindNextFile(findHandle, findData);
}
int errorCode = Marshal.GetLastWin32Error();
if (!(errorCode == ERROR_FILE_NOT_FOUND || errorCode == ERROR_NO_MORE_FILES || errorCode == ERROR_PATH_NOT_FOUND))
{
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
}
}
if (recursive)
{
foreach (string directory in directories)
{
foreach (TResult innerFile in EnumerateFiles <TResult>(Path.Combine(path, directory), pattern, true, findResultHandler, caseSensitive))
{
yield return(innerFile);
}
}
}
}
static extern SafeFindHandle FindFirstFileEx(string fileName, FIndexInfoLevels infoLevel, [In, Out] Win32FindData fineFileData, FIndexSearchOps searchOp, IntPtr searchFilter, SearchAdditionalFlags flags);
