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group-by-in-linq

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Annoyed Angelfish answered on July 13, 2020 Popularity 9/10 Helpfulness 3/10

answer group-by-in-linq

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group-by-in-linq

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using System;
using System.Linq;
using System.Collections.Generic;

class Person
{ 
    public int PersonId; 
    public string car  ; 
}

class Result
{ 
   public int PersonId;
   public List<string> Cars; 
}

public class Program
{
    public static void Main()
    {
        List<Person> persons = new List<Person>()
        {
            new Person { PersonId = 1, car = "Ferrari" },
            new Person { PersonId = 1, car = "BMW" },
            new Person { PersonId = 2, car = "Audi"}
        };

        //With Query Syntax

        List<Result> results1 = (
            from p in persons
            group p by p.PersonId into g
            select new Result()
                {
                    PersonId = g.Key, 
                    Cars = g.Select(c => c.car).ToList()
                }
            ).ToList();

        foreach (Result item in results1)
        {
            Console.WriteLine(item.PersonId);
            foreach(string car in item.Cars)
            {
                Console.WriteLine(car);
            }
        }

        Console.WriteLine("-----------");

        //Method Syntax

        List<Result> results2 = persons
            .GroupBy(p => p.PersonId, 
                     (k, c) => new Result()
                             {
                                 PersonId = k,
                                 Cars = c.Select(cs => cs.car).ToList()
                             }
                    ).ToList();

        foreach (Result item in results2)
        {
            Console.WriteLine(item.PersonId);
            foreach(string car in item.Cars)
            {
                Console.WriteLine(car);
            }
        }
    }
}

Popularity 9/10 Helpfulness 3/10 Language csharp

Source: stackoverflow.com

Tags: c#

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Contributed on Dec 15 2021

Annoyed Angelfish

0 Answers Avg Quality 2/10

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groupby in linq

Comment

var results = from p in persons
              group p.car by p.PersonId into g
              select new { PersonId = g.Key, Cars = g.ToList() };

Popularity 10/10 Helpfulness 5/10 Language csharp

Source: stackoverflow.com

Tags: c# c

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Contributed on Jul 13 2020

Jolly Jellyfish

0 Answers Avg Quality 2/10

groupby in linq

Comment

        //Method Syntax

        List<Result> results2 = persons
            .GroupBy(p => p.PersonId, 
                     (k, c) => new Result()
                             {
                                 PersonId = k,
                                 Cars = c.Select(cs => cs.car).ToList()
                             }
                    ).ToList();

Popularity 10/10 Helpfulness 5/10 Language whatever

Source: stackoverflow.com

Tags: group-by group-b

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Contributed on Jul 13 2020

Jolly Jellyfish

0 Answers Avg Quality 2/10

linq group by

Comment

var results = persons.GroupBy(
    p => p.PersonId, 
    p => p.car,
    (key, g) => new { PersonId = key, Cars = g.ToList() });

Popularity 10/10 Helpfulness 4/10 Language whatever

Source: stackoverflow.com

Tags: whatever whateve

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Contributed on Sep 03 2020

Happy Heron

0 Answers Avg Quality 2/10

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