score:2
Accepted answer
If I understand correctly you can try to use linq Union combine those collections then use GroupBy and Sum get your expect result.
List<Monster> listA = new List<Monster>();
listA.Add(new Monster(0, "snails", 600));
listA.Add(new Monster(1, "slimes", 300));
List<Monster> listB = new List<Monster>();
listB.Add(new Monster(0, "snails", 72));
List<Monster> listC = new List<Monster>();
listC.Add(new Monster(0, "snails", 300));
listC.Add(new Monster(1, "slimes", 371));
listC.Add(new Monster(10, "trolls", 152));
var reuslt = listA
.Union(listB)
.Union(listC)
.GroupBy(x => new { x.Index ,x.Name })
.Select(x=> new Monster(x.Key.Index,x.Key.Name,x.Sum(z=>z.Count)));
Result
index:0 name:snails count:972
index:1 name:slimes count:671
index:10 name:trolls count:152
Source: stackoverflow.com
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