public async Task <OperationResult <FlashSaleProductCanBuyCountModel> > GetUserCanBuyFlashSaleItemCountAsync(Guid userId, Guid activityId, string pid) { if (userId == Guid.Empty || activityId == Guid.Empty || string.IsNullOrWhiteSpace(pid)) { return(OperationResult.FromError <FlashSaleProductCanBuyCountModel>("-1", "参数错误")); } else { return(OperationResult.FromResult(await FlashSaleManager.GetUserCanBuyFlashSaleItemCountAsync(userId, activityId, pid))); } }