/// <summary>
        /// 得到一个对象实体
        /// </summary>
        public Model.UserAnswer DataRowToModel(DataRow row)
        {
            Model.UserAnswer model = new Model.UserAnswer();

            if (row != null)
            {

                if (row["QuestionID"] != null)
                {
                    model.QuestionID = long.Parse(row["QuestionID"].ToString());
                }

                if (row["UserID"] != null)
                {
                    model.UserID = long.Parse( row["UserID"].ToString());
                }

                if (row["Orders"] != null )
                {
                    model.Orders = 0;
                }

                if (row["Answer"] != null && row["Answer"].ToString() != "")
                {
                    model.Answer = row["Answer"].ToString().Split('|');

                }
            }
            return model;
        }
        /// <summary>
        /// 得到一个对象实体
        /// </summary>
        public Model.UserAnswer GetModel(long QuestionID, long UserID)
        {
            StringBuilder strSql = new StringBuilder();
            strSql.Append("select QuestionID,UserID,Orders,Answer from UserAnswer");
            strSql.Append(" where QuestionID=@QuestionID and UserID=@UserID limit 1");
            MySqlParameter[] parameters = {
                    new MySqlParameter("@QuestionID", MySqlDbType.Int64),
                    new MySqlParameter("@UserID", MySqlDbType.Int64),
            };
            parameters[0].Value = QuestionID;
            parameters[1].Value = UserID;

            Model.UserAnswer model = new Model.UserAnswer();
            DataSet ds = DbHelperMySQL.Query(strSql.ToString(), parameters);
            if (ds.Tables[0].Rows.Count > 0)
            {
                return DataRowToModel(ds.Tables[0].Rows[0]);

            }
            else
            {
                return null;
            }
        }