[英]MongoDB C# LINQ - Sum to subdocument (by AsQueryable)
I try use function SUM in LINQ but doesn't work well with subdocuments. 我尝试在LINQ中使用函数SUM,但不适用于子文档。 Has anyone try use SUM for subdocuments ?.
有没有人尝试将SUM用于子文档?
My sample query: 我的示例查询:
var collection = database.GetCollection<Order>("Order").AsQueryable();
var query = from o in collection
from p in o.OrderItems
select p;
var query2 = from orderItem in query
group orderItem by orderItem.ProductId into g
select new
{
ProductId = g.Key,
TotalAmount = g.Sum(x=>x.UnitPriceExclTax)
};
TotalAmount, always returned value 0. TotalAmount,始终返回值0。
Thanks, 谢谢,
Mongo c# LINQ driver don't support SUM properly. Mongo C#LINQ驱动程序不正确支持SUM。 https://jira.mongodb.org/browse/CSHARP-592
https://jira.mongodb.org/browse/CSHARP-592
Its better to use MongoQuery with aggregation sum. 最好将MongoQuery与聚合和一起使用。 Please see the link for detail usage and example.
请查看链接以获取详细用法和示例。 https://docs.mongodb.org/manual/reference/operator/aggregation/sum/
https://docs.mongodb.org/manual/reference/operator/aggregation/sum/
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