我有一个方法可以通过一些 linq 查询从数据库中获取一些数据。数据按预期显示,但不是按我想要的顺序显示。我需要按查询 1 和 2 中显示的 TotalQuantity
属性对从数据库获取的产品进行排序。我尝试使用 OrdeBy
但我不确定如何添加在这种背景下。在这方面需要一些帮助。
这是我的方法:
public IList<BestsellersReportLine> DailyBestsellersReport()
{
OrderStatus os;
PaymentStatus ps;
ShippingStatus ss;
int billingCountryId = 0;
int recordsToReturn = 10;
int orderBy = 1;
int groupBy = 1;
var range = new
{
startTimeUtc = DateTime.Today.AddDays(-1),
endTimeUtc = DateTime.Today.AddSeconds(-1),
CreatedOnUtc = DateTime.Today.AddDays(-1),
};
var query1 = from opv in _opvRepository.Table
join o in _orderRepository.Table on opv.OrderId equals o.Id
join pv in _productVariantRepository.Table on opv.ProductVariantId equals pv.Id
join p in _productRepository.Table on pv.ProductId equals p.Id
where (o.CreatedOnUtc >= range.startTimeUtc && o.CreatedOnUtc <= range.endTimeUtc)
select opv;
var query2 = groupBy == 1 ?
//group by product variants
from opv in query1
group opv by opv.ProductVariantId into g
select new
{
EntityId = g.Key,
TotalAmount = g.Sum(x => x.PriceExclTax),
TotalQuantity = g.Sum(x => x.Quantity),
}
:
//group by products
from opv in query1
group opv by opv.ProductVariant.ProductId into g
select new
{
EntityId = g.Key,
TotalAmount = g.Sum(x => x.PriceExclTax),
TotalQuantity = g.Sum(x => x.Quantity),
};
switch (orderBy)
{
case 1:
{
query2 = query2.OrderByDescending(x => x.TotalQuantity);
}
break;
case 2:
{
query2 = query2.OrderByDescending(x => x.TotalAmount);
}
break;
default:
throw new ArgumentException("Wrong orderBy parameter", "orderBy");
}
if (recordsToReturn != 0 && recordsToReturn != int.MaxValue)
query2 = query2.Take(recordsToReturn);
var result = query2.ToList().Select(x =>
{
var reportLine = new BestsellersReportLine()
{
EntityId = x.EntityId,
TotalAmount = x.TotalAmount,
TotalQuantity = x.TotalQuantity
};
return reportLine;
}).ToList();
return result;
}
最佳答案
返回怎么样
result.OrderBy(x => x.totalQuantity).ToList();
更新: 我只能想到再次将.ToList()添加到末尾。
关于asp.net-mvc - Linq查询,如何orderby,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/21597145/