nature_net.configurations.find_user_of_contribution C# (CSharp) 메소드

        public static User find_user_of_contribution(Contribution c)
        {
            naturenet_dataclassDataContext db = new naturenet_dataclassDataContext();
            var users = from mappings in db.Collection_Contribution_Mappings
                           where mappings.contribution_id == c.id
                           select mappings.Collection.User;
            if (users == null) return null;
            if (users.Count() == 0) return null;
            return users.First<User>();
        }