如何使用 C# 对列表中的相似项进行分组？

Question

I been trying to tackle this for half a day now, with no luck. I have a bunch of objects in a list. I want to sort the list by equal y values, which I did here:

ListOfObjects.Sort((y1,y2) => y1.y.CompareTo(y2.y));

But now I want to separate all objects with equal y values in new lists. How would I approach this?

Answer 1

You can use GroupBy .

var groups = ListOfObjects.GroupBy(x => x.y);

And if you explicitly want lists:

var lists = ListOfObjects.GroupBy(x => x.y).Select(x => x.ToList());