Linq - Top value from each group

Question

How can I employ Linq to select Top value from each group

when I have a code segment like :

var teams = new Team[]
 { 
  new Team{PlayerName=\"Ricky\         


        

Answer 1

The implementation proposed by The Lame Duck is great, but requires two O(n) passes over the grouped set to figure out the Max. It would benefit from calculating MaxScore once and then reusing. This is where SelectMany (the let keyword in C#) comes in handy. Here is the optimized query:

var x = from t in teams 
        group t by t.TeamName into groupedT 
        let maxScore = groupedT.Max(gt => gt.PlayerScore)
        select new 
        { 
           TeamName = groupedT.Key,
           MaxScore = maxScore, 
           MaxPlayer = groupedT.First(gt2 => gt2.PlayerScore == maxScore).PlayerName 
        };