基于一个属性合并2个列表并连接其他属性

Question

IList<MyObject> ob1 = {new MyObject {Id = "1", Items = {BananaObject1, BananaObject2}}}  
IList<MyObject> ob2 = { new MyObject {Id = "1", Items = {BananaObject2, BananaObject3}},  
new MyObject {Id = "2", Items = {BananaObject3, BananaObject3}}}

我想合并2个列表,以便得到结果列表

IList<MyObject> ob2 = { new MyObject {Id = "1", Items = {BananaObject1, BananaObject2, BananaObject3}},
new MyObject {Id = "2", Items = {BananaObject3, BananaObject3}}}

因此,由于2个列表中第一个项目的ID相同,因此它们成为一个,并且其中一个属性被连接起来.
我可以做一个for循环来实现这一点,但我正在为此寻找一个整洁的最佳性能linq表达式.

谢谢

Answer 1

Concat列表一起,GroupById属性,SelectMany以获取合并的项目列表:

ob1.Concat(ob2)
   .GroupBy(o => o.Id)
   .Select(g => new MyObject() 
   { 
      Id = g.Key, 
      Items = g.SelectMany(o => o.Items ).Distinct().ToList()
   });