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public static IEnumerable<string> GetFiles(string root, string searchPattern)
{
    Stack<string> pending = new Stack<string>();
    pending.Push(root);
    while (pending.Count != 0)
    {
        var path = pending.Pop();
        string[] next = null;
        try
        {
            next = Directory.GetFiles(path, searchPattern);
        }
        catch { }
        if (next != null && next.Length != 0)
            foreach (var file in next) yield return file;
        try
        {
            next = Directory.GetDirectories(path);
            foreach (var subdir in next) pending.Push(subdir);
        }
        catch { }
    }
}