Question

What would be the most efficient path to the result I’m looking for? I’m using ASP.NET 4.5 and C#.

Let say I have the following int list:

5,7,2,7,8,5,8,0,2,9,8,8,7

I want to remove duplicates from the list and order it by the number of appearances of each item. I know I can use LINQ’s Distinct() to make the items unique, but how can I also make it order by the number of appearances? This is the desired result for the example above:

8,7,5,2,0,9

Answer 1

var ordered = list
    .GroupBy(x => x)
    .OrderByDescending(g => g.Count())
    .Select(g => g.Key);