我的Nhibernate HQL查询出了什么问题？

public List<TableA> GetRecords(List<string> keys)
    {
        const string query = \"FROM TableA WHERE `Key` = :keys\";
        return session.CreateQuery(query).SetParameterList(\"keys\",keys).List<TableA>().ToList();
    }

List<strings> myKeys = new List<strings> {\"1\", \"2\"};
GetRecords(myKeys)

List<strings> myKeys = new List<strings> {\"1\"};
GetRecords(myKeys)