private async static Task <IReadOnlyList <IStorageItem> > EnumerateFileQuery(string path, string searchPattern, SearchOption searchOption, SearchTarget searchTarget)
{
// Get a StorageFolder for "path"
string fullPath = Path.GetFullPath(path);
StorageFolder folder = await StorageFolder.GetFolderFromPathAsync(fullPath).TranslateWinRTTask(fullPath, isDirectory: true);
// Construct a query for the search.
QueryOptions query = new QueryOptions();
// Translate SearchOption into FolderDepth
query.FolderDepth = searchOption == SearchOption.AllDirectories ? FolderDepth.Deep : FolderDepth.Shallow;
// Construct an AQS filter
string normalizedSearchPattern = PathHelpers.NormalizeSearchPattern(searchPattern);
if (normalizedSearchPattern.Length == 0)
{
// An empty searchPattern will return no results and requires no AQS parsing.
return(new IStorageItem[0]);
}
else
{
// Parse the query as an ItemPathDisplay filter.
string searchPath = PathHelpers.GetFullSearchString(fullPath, normalizedSearchPattern);
string aqs = "System.ItemPathDisplay:~\"" + searchPath + "\"";
query.ApplicationSearchFilter = aqs;
// If the filtered path is deeper than the given user path, we need to get a new folder for it.
// This occurs when someone does something like Enumerate("C:\first\second\", "C:\first\second\third\*").
// When AllDirectories is set this isn't an issue, but for TopDirectoryOnly we have to do some special work
// to make sure something is actually returned when the searchPattern is a subdirectory of the path.
// To do this, we attempt to get a new StorageFolder for the subdirectory and return an empty enumerable
// if we can't.
string searchPatternDirName = Path.GetDirectoryName(normalizedSearchPattern);
string userPath = string.IsNullOrEmpty(searchPatternDirName) ? fullPath : Path.Combine(fullPath, searchPatternDirName);
if (userPath != folder.Path)
{
folder = await StorageFolder.GetFolderFromPathAsync(userPath).TranslateWinRTTask(userPath, isDirectory: true);
}
}
// Execute our built query
if (searchTarget == SearchTarget.Files)
{
StorageFileQueryResult queryResult = folder.CreateFileQueryWithOptions(query);
return(await queryResult.GetFilesAsync().TranslateWinRTTask(folder.Path, isDirectory: true));
}
else if (searchTarget == SearchTarget.Directories)
{
StorageFolderQueryResult queryResult = folder.CreateFolderQueryWithOptions(query);
return(await queryResult.GetFoldersAsync().TranslateWinRTTask(folder.Path, isDirectory: true));
}
else
{
StorageItemQueryResult queryResult = folder.CreateItemQueryWithOptions(query);
return(await queryResult.GetItemsAsync().TranslateWinRTTask(folder.Path, isDirectory: true));
}
}
internal Win32FileSystemEnumerableIterator(string path, string originalUserPath, string searchPattern, SearchOption searchOption, SearchResultHandler <TSource> resultHandler)
{
Contract.Requires(path != null);
Contract.Requires(originalUserPath != null);
Contract.Requires(searchPattern != null);
Contract.Requires(searchOption == SearchOption.AllDirectories || searchOption == SearchOption.TopDirectoryOnly);
Contract.Requires(resultHandler != null);
_oldMode = Interop.mincore.SetErrorMode(Interop.mincore.SEM_FAILCRITICALERRORS);
string normalizedSearchPattern = PathHelpers.NormalizeSearchPattern(searchPattern);
if (normalizedSearchPattern.Length == 0)
{
_empty = true;
}
else
{
_resultHandler = resultHandler;
_searchOption = searchOption;
_fullPath = Path.GetFullPath(path);
string fullSearchString = PathHelpers.GetFullSearchString(_fullPath, normalizedSearchPattern);
_normalizedSearchPath = Path.GetDirectoryName(fullSearchString);
// normalize search criteria
_searchCriteria = GetNormalizedSearchCriteria(fullSearchString, _normalizedSearchPath);
// fix up user path
string searchPatternDirName = Path.GetDirectoryName(normalizedSearchPattern);
_userPath = string.IsNullOrEmpty(searchPatternDirName) ?
originalUserPath :
Path.Combine(originalUserPath, searchPatternDirName);
_searchData = new PathPair(_userPath, _normalizedSearchPath);
CommonInit();
}
}