public List <Article> SelectBy(int?PageSize, int?PageIndex)
        {
            Func <SqlConnection, List <Article> > action = (connection) => DalArticle.SelectBy(connection, PageSize, PageIndex);

            return(dbManager.Execute(action));
        }
        public List <Article> SelectBy(string KeyStr, int?PageSize, int?PageIndex, int?type)
        {
            Func <SqlConnection, List <Article> > action = (connection) => DalArticle.SelectBy(connection, KeyStr, PageSize, PageIndex, type);

            return(dbManager.Execute(action));
        }