private static void DeleteHelper(String fullPath, String userPath, bool recursive, bool throwOnTopLevelDirectoryNotFound)
{
bool r;
int hr;
Exception ex = null;
// Do not recursively delete through reparse points. Perhaps in a
// future version we will add a new flag to control this behavior,
// but for now we're much safer if we err on the conservative side.
// This applies to symbolic links and mount points.
// Note the logic to check whether fullPath is a reparse point is
// in Delete(String, String, bool), and will set "recursive" to false.
// Note that Win32's DeleteFile and RemoveDirectory will just delete
// the reparse point itself.
if (recursive)
{
Win32Native.WIN32_FIND_DATA data = new Win32Native.WIN32_FIND_DATA();
String searchPath = null;
if (fullPath.EndsWith(Path.DirectorySeparatorChar.ToString(), StringComparison.Ordinal))
{
searchPath = fullPath + "*";
}
else
{
searchPath = fullPath + Path.DirectorySeparatorChar + "*";
}
// Open a Find handle
using (SafeFindHandle hnd = Win32Native.FindFirstFile(searchPath, data))
{
if (hnd.IsInvalid)
{
hr = Marshal.GetLastWin32Error();
__Error.WinIOError(hr, userPath);
}
do
{
bool isDir = (0 != (data.dwFileAttributes & Win32Native.FILE_ATTRIBUTE_DIRECTORY));
if (isDir)
{
// Skip ".", "..".
if (data.cFileName.Equals(".") || data.cFileName.Equals(".."))
{
continue;
}
// Recurse for all directories, unless they are
// reparse points. Do not follow mount points nor
// symbolic links, but do delete the reparse point
// itself.
bool shouldRecurse = (0 == (data.dwFileAttributes & (int)FileAttributes.ReparsePoint));
if (shouldRecurse)
{
String newFullPath = LongPath.InternalCombine(fullPath, data.cFileName);
String newUserPath = LongPath.InternalCombine(userPath, data.cFileName);
try
{
DeleteHelper(newFullPath, newUserPath, recursive, false);
}
catch (Exception e)
{
if (ex == null)
{
ex = e;
}
}
}
else
{
// Check to see if this is a mount point, and
// unmount it.
if (data.dwReserved0 == Win32Native.IO_REPARSE_TAG_MOUNT_POINT)
{
// Use full path plus a trailing '\'
String mountPoint = LongPath.InternalCombine(fullPath, data.cFileName + Path.DirectorySeparatorChar);
r = Win32Native.DeleteVolumeMountPoint(mountPoint);
if (!r)
{
hr = Marshal.GetLastWin32Error();
if (hr != Win32Native.ERROR_PATH_NOT_FOUND)
{
try
{
__Error.WinIOError(hr, data.cFileName);
}
catch (Exception e)
{
if (ex == null)
{
ex = e;
}
}
}
}
}
// RemoveDirectory on a symbolic link will
// remove the link itself.
String reparsePoint = LongPath.InternalCombine(fullPath, data.cFileName);
r = Win32Native.RemoveDirectory(reparsePoint);
if (!r)
{
hr = Marshal.GetLastWin32Error();
if (hr != Win32Native.ERROR_PATH_NOT_FOUND)
{
try
{
__Error.WinIOError(hr, data.cFileName);
}
catch (Exception e)
{
if (ex == null)
{
ex = e;
}
}
}
}
}
}
else
{
String fileName = LongPath.InternalCombine(fullPath, data.cFileName);
r = Win32Native.DeleteFile(fileName);
if (!r)
{
hr = Marshal.GetLastWin32Error();
if (hr != Win32Native.ERROR_FILE_NOT_FOUND)
{
try
{
__Error.WinIOError(hr, data.cFileName);
}
catch (Exception e)
{
if (ex == null)
{
ex = e;
}
}
}
}
}
} while (Win32Native.FindNextFile(hnd, data));
// Make sure we quit with a sensible error.
hr = Marshal.GetLastWin32Error();
}
if (ex != null)
{
throw ex;
}
if (hr != 0 && hr != Win32Native.ERROR_NO_MORE_FILES)
{
__Error.WinIOError(hr, userPath);
}
}
r = Win32Native.RemoveDirectory(fullPath);
if (!r)
{
hr = Marshal.GetLastWin32Error();
if (hr == Win32Native.ERROR_FILE_NOT_FOUND) // A dubious error code.
{
hr = Win32Native.ERROR_PATH_NOT_FOUND;
}
// This check was originally put in for Win9x (unfortunately without special casing it to be for Win9x only). We can't change the NT codepath now for backcomp reasons.
if (hr == Win32Native.ERROR_ACCESS_DENIED)
{
throw new IOException(Environment.GetResourceString("UnauthorizedAccess_IODenied_Path", userPath));
}
// don't throw the DirectoryNotFoundException since this is a subdir and there could be a ----
// between two Directory.Delete callers
if (hr == Win32Native.ERROR_PATH_NOT_FOUND && !throwOnTopLevelDirectoryNotFound)
{
return;
}
__Error.WinIOError(hr, userPath);
}
}
