private static bool IsValidWindowsFileName(string fileName)
{
string fileNameNoExt = LongPath.GetFileNameWithoutExtension(fileName);
string fileNameWithExt = LongPath.GetFileName(fileName);
if (Array.Exists <string>(ReservedBaseFileNames, delegate(string s) { return(fileNameNoExt.Equals(s, StringComparison.OrdinalIgnoreCase)); }))
{
return(false);
}
if (Array.Exists <string>(ReservedFileNames, delegate(string s) { return(fileNameWithExt.Equals(s, StringComparison.OrdinalIgnoreCase)); }))
{
return(false);
}
if (string.IsNullOrWhiteSpace(fileNameWithExt))
{
return(false);
}
bool allDotsOrWhiteSpace = true;
for (int i = 0; i < fileName.Length; ++i)
{
if (fileName[i] != '.' && !char.IsWhiteSpace(fileName[i]))
{
allDotsOrWhiteSpace = false;
break;
}
}
if (allDotsOrWhiteSpace)
{
return(false);
}
return(true);
}
public static IEnumerable <string> EnumerateFileSystemEntries(string path, string searchPattern, SearchOption searchOption, FilesOrDirectory filter)
{
#if DOTNET5_4
return(Directory.EnumerateFileSystemEntries(path, searchPattern, searchOption));
#else
NativeMethods.WIN32_FIND_DATA findData;
NativeMethods.SafeFindHandle findHandle;
string currentPath = null;
int errorCode = 0;
Queue <string> folders = new Queue <string>();
String searchPath = LongPath.Combine(path, searchPattern);
path = LongPath.GetDirectoryName(searchPath);
searchPattern = LongPath.GetFileName(searchPath);
folders.Enqueue(path);
while (folders.Count > 0)
{
currentPath = folders.Dequeue();
if (searchOption == SearchOption.AllDirectories)
{
findHandle = NativeMethods.FindFirstFileW(LongPath.Combine(LongPath.ToUncPath(currentPath), "*"), out findData);
if (!findHandle.IsInvalid)
{
do
{
if (findData.FileName != "." &&
findData.FileName != "..")
{
if (findData.FileAttributes == FileAttributes.Directory)
{
folders.Enqueue(LongPath.Combine(currentPath, findData.FileName));
}
}
}while (NativeMethods.FindNextFileW(findHandle, out findData));
// Get last Win32 error right after native calls.
// Dispose SafeFindHandle will call native methods, it is possible to set last Win32 error.
errorCode = Marshal.GetLastWin32Error();
if (findHandle != null &&
!findHandle.IsInvalid)
{
findHandle.Dispose();
}
NativeMethods.ThrowExceptionForLastWin32ErrorIfExists(errorCode,
new int[] {
NativeMethods.ERROR_SUCCESS,
NativeMethods.ERROR_NO_MORE_FILES,
NativeMethods.ERROR_FILE_NOT_FOUND
});
}
else
{
NativeMethods.ThrowExceptionForLastWin32ErrorIfExists(new int[] {
NativeMethods.ERROR_SUCCESS,
NativeMethods.ERROR_NO_MORE_FILES,
NativeMethods.ERROR_FILE_NOT_FOUND
});
}
}
findHandle = NativeMethods.FindFirstFileW(LongPath.Combine(LongPath.ToUncPath(currentPath), searchPattern), out findData);
if (!findHandle.IsInvalid)
{
do
{
if (findData.FileName != "." &&
findData.FileName != "..")
{
if ((filter == FilesOrDirectory.All) ||
(filter == FilesOrDirectory.Directory && findData.FileAttributes == FileAttributes.Directory) ||
(filter == FilesOrDirectory.File && findData.FileAttributes != FileAttributes.Directory))
{
yield return(LongPath.Combine(currentPath, findData.FileName));
}
}
}while (NativeMethods.FindNextFileW(findHandle, out findData));
// Get last Win32 error right after native calls.
// Dispose SafeFindHandle will call native methods, it is possible to set last Win32 error.
errorCode = Marshal.GetLastWin32Error();
if (findHandle != null &&
!findHandle.IsInvalid)
{
findHandle.Dispose();
}
NativeMethods.ThrowExceptionForLastWin32ErrorIfExists(errorCode,
new int[] {
NativeMethods.ERROR_SUCCESS,
NativeMethods.ERROR_NO_MORE_FILES,
NativeMethods.ERROR_FILE_NOT_FOUND
});
}
else
{
NativeMethods.ThrowExceptionForLastWin32ErrorIfExists(new int[] {
NativeMethods.ERROR_SUCCESS,
NativeMethods.ERROR_NO_MORE_FILES,
NativeMethods.ERROR_FILE_NOT_FOUND
});
}
}
#endif
}
