EF 请求数据是缓存 求大神解释

//

//AliexpressEntities MyaliexpressEntities  为了事物一致性 在别的方法里面传过来的 实质还是 (  AliexpressEntities aliexpressEntities = new AliexpressEntities();)

和 userBll.GetUser 方法里面的一样

   public YH_AmountAccount AmountAccountSaveChanges(AliexpressEntities MyaliexpressEntities, int amountAccounUserId, string transactionRemark, int transactionType, string transactionNumber, decimal? transactionAmount, decimal? transactionAmountMMB)
        {
            YH_AmountAccount AmountAccount = new YH_AmountAccount();
            YH_UserBLL userBll = new YH_UserBLL();
            var getuser = userBll.GetUser(amountAccounUserId);   //为什么  这里是 51.2 (正确 )

            var userNow = MyaliexpressEntities.YH_User.Where(p => p.userId == amountAccounUserId).Single();   //这里是 63.8 (还是之前的数据)

            AmountAccount.createTime = DateTime.Now;
            AmountAccount.isActive = true;
            AmountAccount.createUserId = userNow.userId;
            AmountAccount.amountAccounUserId = userNow.userId;
            AmountAccount.transactionRemark = transactionRemark;
            AmountAccount.transactionType = transactionType; //(transactionType 1发布任务 2删除任务 3完成任务 4账户充值)
            AmountAccount.transactionNumber = transactionNumber;
            AmountAccount.initialAmount = userNow.Balance + userNow.BalanceLocked;
            AmountAccount.initialAmountMMB = userNow.MMCoin + userNow.MMCoinLocked;
            AmountAccount.transactionAmount = transactionAmount;
            AmountAccount.transactionAmountMMB = transactionAmountMMB;
            AmountAccount.accountBalance = AmountAccount.initialAmount - AmountAccount.transactionAmount;
            AmountAccount.accountBalanceMMB = AmountAccount.initialAmountMMB - AmountAccount.transactionAmountMMB;
            userNow.MMCoin = AmountAccount.accountBalanceMMB - userNow.MMCoinLocked;
            userNow.Balance = AmountAccount.accountBalance - userNow.BalanceLocked;
            if (userNow.Balance < 0)
            {
                throw new Exception("您账户的可用余额不足,请充值!");
            }
            return AmountAccount;
        }

　　

userBll.GetUser 方法

namespace Aliexpress.BLL
{
    public class YH_UserBLL
    {

        AliexpressEntities aliexpressEntities = new AliexpressEntities();

        public YH_User GetUser(int userId)
        {
            var user = aliexpressEntities.YH_User.Where(p => p.userId == userId&&p.isActive==true).SingleOrDefault();
            return user;
        }
    }
}

//调试数据