回答編集履歴
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**【追記】**
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下の 2021/03/21 17:08 の私のコメントで「上の回答で書いたコードの grouped を Country でもう一度グループ化します。後で回答欄に追記しておきます」と書いた件です。上の回答は .NET Framework 4.8 ですが、質問者さんは .NET 5 とのことですので .NET 5 で書きました。
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コードの下の方にある Human2, Person クラスに IEnumerable<Human2> として取得しています。それを JSON にシリアライズした結果も書いておきます（2021/03/21 15:11 のコメントのものと同じです）。
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```
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text.Json;
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namespace ConsoleAppLinq
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{
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class Program
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{
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static void Main(string[] args)
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{
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IEnumerable<Human> human = new List<Human>
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{
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new Human{ Country = "JP", Name = "Taro", Login = 10},
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new Human{ Country = "JP", Name = "Jiro", Login = 5},
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new Human{ Country = "US", Name = "Mike", Login = 20},
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new Human{ Country = "JP", Name = "Taro", Login = 1}
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};
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var grouped = human
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.GroupBy(h => new { Country = h.Country, Name = h.Name })
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.Select(g => new Human
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{
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Country = g.Key.Country,
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Name = g.Key.Name,
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Login = (uint)g.Sum(x => x.Login)
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});
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foreach (var item in grouped)
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{
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Console.WriteLine($"Country: {item.Country}, Name: {item.Name}, Login: {item.Login}");
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}
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// ここまでは前回の回答と同じ
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Console.WriteLine("------------------------------");
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var grouped2 = grouped
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.GroupBy(h => h.Country)
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.Select(g => new Human2
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{
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Country = g.Key,
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PersonalData = g.Select(p => new Person
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{
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Name = p.Name,
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Login = p.Login
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})
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});
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var json = JsonSerializer.Serialize<IEnumerable<Human2>>(grouped2,
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new JsonSerializerOptions
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{
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WriteIndented = true
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});
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Console.WriteLine(json);
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}
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}
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public class Human
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{
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public string Country { get; set; }
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public string Name { get; set; }
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public uint Login { get; set; }
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}
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public class Human2
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{
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public string Country { get; set; }
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public IEnumerable<Person> PersonalData { get; set; }
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}
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public class Person
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{
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public string Name { get; set; }
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public uint Login { get; set; }
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}
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}
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+
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+
```
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+
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283
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+
結果は：
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