public static void Decrypt(String path)
{
if (path == null)
{
throw new ArgumentNullException(nameof(path));
}
Contract.EndContractBlock();
String fullPath = Path.GetFullPath(path);
FileIOPermission.QuickDemand(FileIOPermissionAccess.Read | FileIOPermissionAccess.Write, fullPath, false, false);
bool r = Win32Native.DecryptFile(fullPath, 0);
if (!r)
{
int errorCode = Marshal.GetLastWin32Error();
if (errorCode == Win32Native.ERROR_ACCESS_DENIED)
{
// Check to see if the file system is not NTFS. If so,
// throw a different exception.
DriveInfo di = new DriveInfo(Path.GetPathRoot(fullPath));
if (!String.Equals("NTFS", di.DriveFormat))
{
throw new NotSupportedException(Environment.GetResourceString("NotSupported_EncryptionNeedsNTFS"));
}
}
__Error.WinIOError(errorCode, fullPath);
}
}
