Safe EnumerateFiles extension for DirectoryInfo without UnauthorizedAccessException

SafeEnumerateFiles.cs

public static IEnumerable<FileInfo> SafeEnumerateFiles(this DirectoryInfo target, string pattern = "*.*")
{
    var allFiles = Enumerable.Empty<FileInfo>();
    
    var stack = new Stack<DirectoryInfo>();
    stack.Push(target);

    while (stack.Any())
    {
        var current = stack.Pop();
        var files = getFiles(current, pattern);
        allFiles = allFiles.Concat(files);

        foreach (var subdirectory in getSubdirectories(current))
        {
            stack.Push(subdirectory);
        }
    }

    return allFiles;
}

private static IEnumerable<FileInfo> getFiles(DirectoryInfo directory, string pattern)
{
    try
    {
        return directory.EnumerateFiles(pattern, SearchOption.TopDirectoryOnly);
    }
    catch (UnauthorizedAccessException)
    {
        return Enumerable.Empty<FileInfo>();
    }
}

private static IEnumerable<DirectoryInfo> getSubdirectories(DirectoryInfo directory)
{
    try
    {
        return directory.EnumerateDirectories("*", SearchOption.TopDirectoryOnly);
    }
    catch (UnauthorizedAccessException)
    {
        return Enumerable.Empty<DirectoryInfo>();
    }
}