public override bool MoveNext()
{
var data = new FindData();
switch (state)
{
case stateInit:
{
if (isEmpty)
{
state = stateFinish;
goto case stateFinish;
}
if (searchData.searchOptions == SearchOption.TopDirectoryOnly)
{
state = stateFindNextFile;
if (current != null)
{
return(true);
}
goto case stateFindNextFile;
}
state = stateSearchNextDir;
goto case stateSearchNextDir;
}
case stateSearchNextDir:
{
Contract.Assert(searchData.searchOptions != SearchOption.TopDirectoryOnly, "should not reach this code path if searchOption == TopDirectoryOnly");
// Traverse directory structure. We need to get '*'
while (searchStack.Count > 0)
{
searchData = searchStack[0];
Contract.Assert((searchData.fullPath != null), "fullpath can't be null!");
searchStack.RemoveAt(0);
// Traverse the subdirs
AddSearchableDirsToStack(searchData);
// Execute searchCriteria against the current directory
String searchPath = searchData.fullPath + searchCriteria;
// Open a Find handle
safeFindHandle = Win32Api.IO.FindFirstFile(searchPath, data);
if (safeFindHandle.IsInvalid)
{
int hr = Marshal.GetLastWin32Error();
if (hr == Win32Error.ERROR_ACCESS_DENIED || hr == Win32Error.ERROR_FILE_NOT_FOUND || hr == Win32Error.ERROR_NO_MORE_FILES || hr == Win32Error.ERROR_PATH_NOT_FOUND)
{
continue;
}
safeFindHandle.Dispose();
HandleError(hr, searchData.fullPath);
}
state = stateFindNextFile;
needsParentPathDiscoveryDemand = true;
SearchResult searchResult = CreateSearchResult(searchData, data);
if (resultHandler.IsResultIncluded(searchResult))
{
if (needsParentPathDiscoveryDemand)
{
DoDemand(searchData.fullPath);
needsParentPathDiscoveryDemand = false;
}
current = resultHandler.CreateObject(searchResult);
return(true);
}
goto case stateFindNextFile;
}
state = stateFinish;
goto case stateFinish;
}
case stateFindNextFile:
{
if (searchData != null && safeFindHandle != null)
{
// Keep asking for more matching files/dirs, add it to the list
while (Win32Api.IO.FindNextFile(safeFindHandle, data))
{
SearchResult searchResult = CreateSearchResult(searchData, data);
if (resultHandler.IsResultIncluded(searchResult))
{
if (needsParentPathDiscoveryDemand)
{
DoDemand(searchData.fullPath);
needsParentPathDiscoveryDemand = false;
}
current = resultHandler.CreateObject(searchResult);
return(true);
}
}
// Make sure we quit with a sensible error.
int hr = Marshal.GetLastWin32Error();
if (safeFindHandle != null)
{
safeFindHandle.Dispose();
}
// ERROR_FILE_NOT_FOUND is valid here because if the top level
// dir doen't contain any subdirs and matching files then
// we will get here with this errorcode from the searchStack walk
if ((hr != 0) && (hr != Win32Error.ERROR_NO_MORE_FILES) &&
(hr != Win32Error.ERROR_FILE_NOT_FOUND))
{
HandleError(hr, searchData.fullPath);
}
}
if (searchData.searchOptions == SearchOption.TopDirectoryOnly)
{
state = stateFinish;
goto case stateFinish;
}
state = stateSearchNextDir;
goto case stateSearchNextDir;
}
case stateFinish:
{
Dispose();
break;
}
}
return(false);
}