合并2个列表并使用LINQ汇总几个属性 [英] Merging 2 lists and sum several properties using LINQ
本文介绍了合并2个列表并使用LINQ汇总几个属性的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一个包含以下属性的类:
I have an class which contains the following properties:
public class SomeClass()
{
public Int32 ObjectId1 {get;set;}
public Int32 ObjectId2 {get;set;}
public Int32 ActiveThickeness {get;set;}
public Int32 ActiveFilterThickness {get;set;}
}
我还有2个列表:
List<SomeClass> A
List<SomeClass> B
列表A具有数据:
| ObjectId1 | ObjectId2 | ActiveThickness | ActiveFilterThickness |
-------------------------------------------------------------------
| 1 | 3 | 50 | 0 |
------------------------------------------------------------------
| 1 | 2 | 400 | 0 |
-------------------------------------------------------------------
| 4 | 603 | 27 | 0 |
-------------------------------------------------------------------
列表B具有数据:
| ObjectId1 | ObjectId2 | ActiveThickness | ActiveFilterThickness |
-------------------------------------------------------------------
| 1 | 3 | 0 | 13671 |
------------------------------------------------------------------
| 1 | 2 | 0 | 572 |
-------------------------------------------------------------------
| 29 | 11 | 0 | 4283 |
-------------------------------------------------------------------
我想将A和B(如果可能的话使用LINQ)合并到SomeCalss的列表C中,该列表包含以下数据:
I want to merge A and B (using LINQ if possible) into List C of SomeCalss which contains data as followed:
| ObjectId1 | ObjectId2 | ActiveThickness | ActiveFilterThickness |
-------------------------------------------------------------------
| 1 | 3 | 50 | 13671 |
------------------------------------------------------------------
| 1 | 2 | 400 | 572 |
-------------------------------------------------------------------
| 29 | 11 | 0 | 4283 |
-------------------------------------------------------------------
| 4 | 603 | 27 | 0 |
-------------------------------------------------------------------
我该如何实现?
推荐答案
使用GroupBy
对普通对象进行分组,并使用Sum
对所需属性进行求和
Use GroupBy
to group common objects and Sum
to sum required properties
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)
});
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