// @nuget: Newtonsoft.Json

using System;

using System.Linq;

using System.Collections.Generic;

using Newtonsoft.Json;

​

//https://dotnetfiddle.net/ik9qTL

class PetOwner

{

    public string Name { get; set; }

    public List<String> Pets { get; set; }

}

public class Program{

​

public static void Main()

{

    PetOwner[] petOwners =

        { new PetOwner { Name="Higa, Sidney",

              Pets = new List<string>{ "Scruffy", "Sam" } },

          new PetOwner { Name="Ashkenazi, Ronen",

              Pets = new List<string>{ "Walker", "Sugar" } },

          new PetOwner { Name="Price, Vernette",

              Pets = new List<string>{ "Scratches", "Diesel" } } };

​

    // Query using SelectMany().

    IEnumerable<string> query1 = petOwners.SelectMany(petOwner => petOwner.Pets);

​

    Console.WriteLine("Using SelectMany():");

​

    // Only one foreach loop is required to iterate

    // through the results since it is a

    // one-dimensional collection.

    foreach (string pet in query1)

    {

        Console.WriteLine(pet);

    }

​

    // This code shows how to use Select()

    // instead of SelectMany().

    IEnumerable<List<String>> query2 =

        petOwners.Select(petOwner => petOwner.Pets);

​

    Console.WriteLine("\nUsing Select():");

​

    // Notice that two foreach loops are required to

    // iterate through the results

    // because the query returns a collection of arrays.

    foreach (List<String> petList in query2)

    {

        foreach (string pet in petList)

        {

            Console.WriteLine(pet);

        }

        Console.WriteLine();

    }

}

}

​

/*

 This code produces the following output:

​

 Using SelectMany():

 Scruffy

 Sam

 Walker

 Sugar

 Scratches

 Diesel

​

 Using Select():

 Scruffy

 Sam

​

 Walker

 Sugar

​

 Scratches

 Diesel

*/