CODEWITHSUNDEEP
c#linqsorting
leora
leora

Reputation: 196469

In C#, how can I order a list after its grouped by size of the list?

Lets say I have a collection of car objects

3 blue cars
10 yellow car
5 red cars 

List<Car> cars = GetList();
var groupBy = cars.GroupBy(r=>r.Color);

I now want to sort the groupBy grouped collection in descending order so I first get the yellow cars, then red and then blue when i loop through the list

What is the correct way to sort a grouped list by the size of the collection in that entry of the group by list?

Upvotes: 0

Views: 187

Answers (2)

Tim.Tang
Tim.Tang

Reputation: 3188

var result = cars.GroupBy(r=>r.Color).OrderByDescending(g => g.Count());

Upvotes: 3

Felipe Oriani
Felipe Oriani

Reputation: 38598

When you group a collection, you will get a IEnumerable<Grouping<TKey, TValue>> collection which has the Key property and Value property. The Key is the value which you have grouped and the Value is the entire object grouped by the Key. You also have all extensions for IEnumerable.

In your case, you could just call the OrderByDescending method passing the Count() method from group colelction, for sample:

var result = cars.GroupBy(r=>r.Color).OrderByDescending(x => x.Count());

Upvotes: 0

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