How to get duplicate items from a list using LINQ?
c#, duplicates, linq
Solution
var duplicates = lst.GroupBy(s => s)
.SelectMany(grp => grp.Skip(1));
Note that this will return all duplicates, so if you only want to know which items are duplicated in the source list, you could apply `Distinct` to the resulting sequence or use the solution given by Mark Byers.
Problem
I'm having a `List<string>` like: ``` List<String> list = new List<String>{"6","1","2","4","6","5","1"}; ``` I need to get the duplicate items in the list into a new list. Now I'm using a nested `for` loop to do this. The resulting `list` will contain `{"6","1"}`. Is there any idea to do this using LINQ or lambda expressions?