Question

I have two classes Teams and PlayerTeams

public class PlayerTeams
{
    public int ID { get; set; }
    public string PlayerName { get; set; }
    public string PlayerCountry { get; set; }
    public bool IsActive { get; set; }

    public string PlayerTeam { get; set; }
}

public class Players
{
    public int ID { get; set; }
    public string Name { get; set; }
    public string Country { get; set; }
    public bool? Status { get; set; }
}

I have a list of PlayerTeams which is grouped by PlayerTeam like this.

var groupedPlayers = teams
            .OrderBy(x => x.PlayerName)
            .GroupBy( x => x.PlayerTeam)
            .ToList();

Its of type List<IGrouping<string, PlayerTeams>> but I want it to be of type List<IGrouping<string, Players>> as I do not want the redundant key information on every row.

How could I possibly achieve that? I could only think of something like .ConvertAll() on the IGrouping. I am not able to make it also.

Is there an efiicient way to do this?

Answer 1

If you can change the grouping, I’d just use:

var groupedPlayers = teams
            .OrderBy(x => x.PlayerName)
            .GroupBy(x => x.PlayerTeam, Players.FromPlayerTeam)
            .ToList();

Where Players.FromPlayerTeam is a static method in Players which takes a PlayerTeam and returns a Players.

Additionally, I’d suggest using ToLookup instead of GroupBy – a Lookup is exactly what you want here, without bothering with the ToList call.