using System;

using System.Collections.Generic;

using System.Linq;

using Newtonsoft.Json;

using Newtonsoft.Json.Converters;

​

public class Program

{

    public static void Main()

    {

        var result = JsonConvert.DeserializeObject<SoNumbers>(GetJson());

        var area1 = result.Result.Areas.FirstOrDefault(x => x.Id == 1);

        var validItems = area1.Items.Where(IsItemValid);

        var avg = validItems.Average(x => x.Value);

        Console.WriteLine($"Area n°{area1.Id}, ItemSelected = [{string.Join(",", validItems.Select(x => x.Name))}] Average = {avg};");

    }

​

    static bool IsItemValid(Item item)

    {

        return (item.Numbers[0] == 2 || item.Numbers[0] == -2) 

            && item.Numbers[1] > 1 

            && item.Numbers[2] > 0 

            && item.Numbers[3] == 1;

    }

​

    public static string GetJson()

    {

        return @"{

    ""result"": {

        ""areas"": [

            {

                ""area"": 1,

                ""items"": [

                    {

                        ""name"": ""name1"",

                        ""numbers"": [

                            2,

                            2,

                            2,

                            1

                        ],

                        ""value"": 0.3

                    },

                    {

                        ""name"": ""name2"",

                        ""numbers"": [

                            0,

                            1,

                            0,

                            1

                        ],

                        ""value"": 0.6

                    },

                    {

                        ""name"": ""name3"",

                        ""numbers"": [

                            -2,

                            3,

                            1,

                            1

                        ],

                        ""value"": 0.5

                    }

                ]

            },

            {

                ""area"": 2,

                ""items"": [

                    {

                        ""name"": ""name4"",

                        ""numbers"": [

                            1,

                            2,

                            3,

                            4

                        ],

                        ""value"": 0.7

                    }

                ]

            }

        ]

    }

}";

    }

​

    public partial class SoNumbers

    {

        [JsonProperty("result")]

        public Result Result { get; set; }

    }

​

    public partial class Result

    {

        [JsonProperty("areas")]

        public List<Area> Areas { get; set; }

    }

​

    public partial class Area

    {

        [JsonProperty("area")]

        public long Id { get; set; }

​

        [JsonProperty("items")]

        public List<Item> Items { get; set; }

    }

​

    public partial class Item

    {

        [JsonProperty("name")]

        public string Name { get; set; }

​

        [JsonProperty("numbers")]

        public List<long> Numbers { get; set; }

​

        [JsonProperty("value")]

        public double Value { get; set; }

    }

}