在创建带输出参数和返回值的存储过程时-犯下的一个低级异常

if exists(select * from sysobjects where name='usp_AllPmsTest')	drop proc usp_AllPmsTestgocreate proc usp_AllPmsTest@cityName nvarchar(30),@id int outputasbegin	insert into ShopModelBak values(@cityName,1,1)	set @id=@@identity	select CPName,CName,SName,MType,MName,Mprice from ShopMenu 	inner join ShopModel on ShopMenu.MShopId=ShopModel.SId	inner join View_CityData on ShopMenu.MCityId=CId	where CName=@cityName	return (select count(1) from ShopMenu)endgodeclare @total int,@id intexec @total=usp_AllPmsTest '滨湖区',@id outputselect @id Id,@total total

var pms = new SqlParameter[]                          {                          new SqlParameter("@cityName", "滨湖区"),                          new SqlParameter("@id", SqlDbType.Int),                          new SqlParameter("@total", SqlDbType.Int)                          };            pms[1].Direction = ParameterDirection.Output;            pms[2].Direction = ParameterDirection.ReturnValue;            var list = SQLHelper.ExecuteReader<ShopMenu>("usp_AllPmsTest", CommandType.StoredProcedure, pms);            foreach (var item in list)            {                Console.WriteLine(item.MName + " " + item.MPrice);            }            Console.WriteLine("刚才插入的ID是：{0},总共{1}条数据", pms[1].Value, pms[2].Value);