public MemberAmount Decrease(MemberAmountType amountType, long amount)
{
var a = GetSingle(amountType);
a.Amount -= amount;
return(a);
}
public static MemberAmount GetSingleOrNewMemberAmount(this DbContext context, MemberAmountType amountType, int memberId)
{
var model = context.Set <MemberAmount>().Where(m => m.AmountType == amountType && m.MemberId == memberId).FirstOrDefault();
if (model == null)
{
model = new MemberAmount
{
Amount = 0,
AmountType = amountType,
MemberId = memberId
};
context.AddToMemberAmount(model);
}
return(model);
}
/// <summary>
/// 增加指定类型金额
/// </summary>
/// <param name="context"></param>
/// <param name="customerId"></param>
/// <param name="amountType"></param>
/// <param name="amount"></param>
/// <returns></returns>
public static MemberAmount IncreaseMemberAmount(this DbContext context, int customerId, MemberAmountType amountType, long amount)
{
var model = context.GetSingleOrNewMemberAmount(amountType, customerId);
model.Amount += amount;
return(model);
}
public MemberAmount GetSingle(MemberAmountType amountType)
{
return(this.Where(m => m.AmountType == amountType).FirstOrDefault());
}
