using System;

using System.Collections.Generic;

using Newtonsoft.Json;

using System.Linq;

public class Program

{

    public static void Main()

    {

    var data = GetTestData();

    var result = data.GroupBy(x=> new {x.Name,x.Grade,x.CardID,x.Date})

                .Select(x=> new PointCardViewModel

                        {

                            CardId=x.Key.CardID,

                            StudentName = x.Key.Name,

                            Grade = x.Key.Grade,

                            EvaluationDate = x.Key.Date,

                            LineItems = x.Select(c=> new LineItemViewModel

                            {

                                ClassPeriod = c.Class,

                                Listen = c.Listen,

                                Read = c.Read,

                                Write = c.Write

                            }).ToDictionary(key=>key.ClassPeriod,value=>(object)value)

                        });

        var jsonData = JsonConvert.SerializeObject(result, Newtonsoft.Json.Formatting.Indented);

        Console.WriteLine(jsonData);

    }

    public static IEnumerable<Sample> GetTestData()

    {

        return new List<Sample>

                        {

                            new Sample{

                                Name = "Jane Doe",

                                Grade = "A",

                                CardID = 1001,

                                Date = new DateTime(2020,10,1),

                                Class = "Period 1- Spanish",

                                Listen = 500,

                                Read = 500,

                                Write = 500

                            },

                            new Sample{

                                Name = "John Doe",

                                Grade = "B+",

                                CardID = 1002,

                                Date = new DateTime(2020,10,2),

                                Class = "Period 1- English",

                                Listen = 1000,

                                Read = 1000,

                                Write = 1000

                            },

                            new Sample{

                                Name = "Jane Doe",

                                Grade = "A",

                                CardID = 1001,

                                Date = new DateTime(2020,10,1),

                                Class = "Period 3- English",

                                Listen = 500,

                                Read = 1000,

                                Write = 1000

                            },

                        };

    }

}

​

​

​

public class PointCardViewModel 

{

    public int CardId { get; set; }

    public string StudentName { get; set; }

    public string Grade { get; set; }

    public DateTime EvaluationDate { get; set; }

    [JsonExtensionData]

    public IDictionary<string, object> LineItems { get; set; }

}

public class LineItemViewModel

{

    public string ClassPeriod { get; set; }

    public int Listen { get; set; }

    public int Read { get; set; }

    public int Write { get; set; }

}

​

// You can define other methods, fields, classes and namespaces here

public class Sample

{

    public string Name{get;set;}

    public string Grade{get;set;}

    public int CardID{get;set;}

    public DateTime Date{get;set;}

    public string Class{get;set;}

    public int Listen{get;set;}

    public int Read{get;set;}

    public int Write{get;set;}

}