[英]Merging 2 lists and sum several properties using LINQ
I have an class which contains the following properties: 我有一个包含以下属性的类:
public class SomeClass()
{
public Int32 ObjectId1 {get;set;}
public Int32 ObjectId2 {get;set;}
public Int32 ActiveThickeness {get;set;}
public Int32 ActiveFilterThickness {get;set;}
}
I also have 2 lists: 我还有2个列表:
List<SomeClass> A
List<SomeClass> B
List A has data: 列表A有数据:
| ObjectId1 | ObjectId2 | ActiveThickness | ActiveFilterThickness |
-------------------------------------------------------------------
| 1 | 3 | 50 | 0 |
------------------------------------------------------------------
| 1 | 2 | 400 | 0 |
-------------------------------------------------------------------
| 4 | 603 | 27 | 0 |
-------------------------------------------------------------------
List B has data: 清单B有数据:
| ObjectId1 | ObjectId2 | ActiveThickness | ActiveFilterThickness |
-------------------------------------------------------------------
| 1 | 3 | 0 | 13671 |
------------------------------------------------------------------
| 1 | 2 | 0 | 572 |
-------------------------------------------------------------------
| 29 | 11 | 0 | 4283 |
-------------------------------------------------------------------
I want to merge A and B (using LINQ if possible) into List C of SomeCalss which contains data as followed: 我想将A和B(如果可能的话使用LINQ)合并到SomeCalss的List C中,其中包含如下数据:
| ObjectId1 | ObjectId2 | ActiveThickness | ActiveFilterThickness |
-------------------------------------------------------------------
| 1 | 3 | 50 | 13671 |
------------------------------------------------------------------
| 1 | 2 | 400 | 572 |
-------------------------------------------------------------------
| 29 | 11 | 0 | 4283 |
-------------------------------------------------------------------
| 4 | 603 | 27 | 0 |
-------------------------------------------------------------------
How can I achieve that? 我怎样才能做到这一点?
Use GroupBy
to group common objects and Sum
to sum required properties 使用
GroupBy
对公共对象进行分组,使用Sum
对所需属性求和
var ab = A.Concat(B).GroupBy(x => new
{
x.ObjectId1,
x.ObjectId2
});
var result = ab.Select(x => new SomeClass
{
ObjectId1 = x.Key.ObjectId1,
ObjectId2 = x.Key.ObjectId2,
ActiveFilterThickness = x.Sum(i => i.ActiveFilterThickness),
ActiveThickeness = x.Sum(i => i.ActiveThickeness)
});
See LINQ - Full Outer Join (SO). 请参阅LINQ - 完全外部加入 (SO)。
By doing a left outer join and a right outer join, and then taking the union of those two, you should get what you're looking for. 通过左外连接和右外连接,然后取两者的结合,你应该得到你正在寻找的东西。
var leftOuterJoin = from someclass1 in A
join someclass2 in B
on someclass1.ObjectID2 equals someclass2.ObjectID2
into temp
from item in temp.DefaultIfEmpty(new SomeClass(){ objectID1 = someclass1.objectID1, ... })
select new SomeClass()
{
...
};
var rightOuterJoin = from someclass2 in B
join someclass1 in A
on someclass1.ObjectID2 equals someclass2.ObjectID2
into temp
from item in temp.DefaultIfEmpty(new SomeClass(){ objectID1 = someclass1.objectID1, ... })
select new SomeClass()
{
...
};
var fullOuterJoin = leftOuterJoin.Union(rightOuterJoin);
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