select distinct name and combine an objects property in a List<T>

Question

I have have a List below, and I am trying to combine the T.name property and sum up the T.score property

Data

Name | score
-------------
Jon  | 50
Jon  | 100
Ash  | 100
Ash  | 75

Desired result is

Jon  | 150
Ash  | 175

I am able to do this in LINQ and create a var with the desired results

List<PieSeriesData> PiSeriesData = new List<PieSeriesData>();
var x = PiSeriesData.GroupBy(i => i.Name)
                    .Select(g => new { Id = g.Key, Total = g.Sum(i => i.Score) })
                    .ToList();

The issue with that is I need x to be a List type, which is what the HighCharts nuget requires.

Answer 1

Why not create new class

public class PieSeriesRenderData
{
    public string ID { get; set; }
    public int Total { get; set; }
}

And after that return this:

List<PieSeriesData> piSeriesData = new List<PieSeriesData>();
var x = piSeriesData.GroupBy(i => i.Name)
                    .Select(g => new PieSeriesRenderData { Id = g.Key, Total = g.Sum(i => i.Score) })
                    .ToList();

Now you will have object of List<PieSeriesRenderData> which you can return it as Json from your web service and you will render the highchart in your ajax.successful method.

Answer 2

As I understand from the chat you need the output to be a List<PieSeriesData> . You need to project a new object of PieSeriesData class in the select and not of an anonymous type: _See that you also need to assign the properties that exist and not use new ones like Id and Total :

List<PieSeriesData> PiSeriesData = new List<PieSeriesData>();
var x = PiSeriesData.GroupBy(i => i.Name)
                    .Select(g => new PieSeriesData { 
                        Name = g.Key, 
                        Score = g.Sum(i => i.Score) 
                    }).ToList();

// Now x is of type: List<PieSeriesData>