will be fail in bab == aba

bad_anagram_Except.cs

void Main()
{
    Func<string, string, bool> anagram = (first, second) =>
    {
        if (string.IsNullOrEmpty(first) || string.IsNullOrEmpty(second)) return false;
        if (first.Length != second.Length) return false;
        return !first.Except(second).Any();
    };

    var sw = Stopwatch.StartNew();
    foreach (var item in Enumerable.Range(0, 100000))
    {
        anagram(" ", " ");
        anagram("1", "1");
        anagram("eros", "rose");
        anagram("eros", "lose");
        anagram("", "rose");
        anagram("eros", "rosesssss");
        anagram("bab", "aba");
        anagram(" ", "  ");
        anagram(null, null);
        anagram(null, "");
        anagram("hoge", null);
        anagram("1", "2");
    }
    sw.Stop();
    $"{sw.Elapsed.TotalMilliseconds}ms".Dump("Sequence");

    "".Dump("Sort");
    Debug.Assert(anagram(" ", " ").Dump("1"));
    Debug.Assert(anagram("1", "1").Dump("2"));
    Debug.Assert(anagram("eros", "rose").Dump("3"));
    Debug.Assert(anagram("eros", "lose").Dump("4") == false);
    Debug.Assert(anagram("", "rose").Dump("5") == false);
    Debug.Assert(anagram("eros", "rosesssss").Dump("6") == false);
    Debug.Assert(anagram("bab", "aba").Dump("7") == false);
    Debug.Assert(anagram(" ", "  ").Dump("8") == false);
    Debug.Assert(anagram(null, null).Dump("9") == false);
    Debug.Assert(anagram(null, "").Dump("10") == false);
    Debug.Assert(anagram("hoge", null).Dump("11") == false);
    Debug.Assert(anagram("1", "2").Dump("12") == false);
}