using System;

using Newtonsoft.Json;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    const string json = $$"""

[{

    "id": 26,

    "date": "2023-08-30T18:36:24",

    "date_gmt": "2023-08-30T18:36:24",  

    "acf": {

        "name": "John",

        "lastName": "Smith",

        "age": "33"     

    }

}, {

    "id": 20,

    "date": "2023-06-11T11:17:02",

    "date_gmt": "2023-06-11T11:17:02",

    "acf": {

        "name": "Randy",

        "lastName": "Jones ",

        "age": "22"     

    }

},

{

    "id": 20,

    "date": "2023-06-11T11:17:02",

    "date_gmt": "2023-06-11T11:17:02",

    "acf": {

        "name": "Mark",

        "lastName": "Taylor ",

        "age": "56" 

    }       

}]

""";

    public static void Main()

    {

        List<Item> items = JsonConvert.DeserializeObject<List<Item>>(json);

        foreach (var item in items)

        {

            Console.WriteLine($"{item.acf.name} {item.acf.lastName} ({item.acf.age})");

        }

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

        List<Acf> acfs = items.Select(item => item.acf).ToList();

        // basically same as

        //List<Acf> acfs = new List<Acf>(items.Count);

        //foreach(var item in items)

        //{

        //    acfs.Add(item.acf);

        //}

        foreach (var acf in acfs)

        {

            Console.WriteLine($"{acf.name} {acf.lastName} ({acf.age})");

        }

    }

}

​

public class Item

{

    public Acf acf;

}

​

public class Acf

{

    public string name { get; set; }

    public string lastName { get; set; }

    public string age { get; set; }

}