enum extention 예시

public static class ClubTypeToStringKey

{

    private static Dictionary<CLUB_TYPE, StringTableKeys> typeTostringKey

        = new Dictionary<CLUB_TYPE, StringTableKeys>();

    public static StringTableKeys ToStringKey(this CLUB_TYPE type)

    {

        if(typeTostringKey.ContainsKey(type))

        {

            return typeTostringKey[type];

        }

        StringTableKeys result;

        if (Enum.TryParse(type.ToString(), out result))

        {

            typeTostringKey.Add(type, result);

        }

        return typeTostringKey[type];

    }

}