public string Consumption(int id,double money,int gid,int uid)
{
YogaEntities ye = new YogaEntities();
Member cc = ye.Member.FirstOrDefault((ccc) => ccc.Id == id);
if (cc == null) return string.Format("编号为{0}的会员不存在", id);
if (cc.CardRestMoney < money) return "余额不足";
Goods g = ye.Goods.FirstOrDefault((gg) => gg.Id == gid);
if (g == null) return string.Format("编号为{0}的商品不存在", gid);
User u = ye.User.FirstOrDefault((uu) => uu.Id == uid);
if (u == null) return string.Format("编号为{0}的操作员不存在", uid);
cc.CardRestMoney -= money;
cc.Score += (int)money;
var cr = new ConsumptionRecord()
{
Date = DateTime.Now,
MemberId = id,
MemberName = cc.Name,
GoodsId = gid,
GoodsName = g.Name,
UserId = uid,
Operater = u.Name
};
ye.AddToConsumptionRecord(cr);
return ye.SaveChanges() == 2 ? "扣值成功" : "扣值失败";
}