FormatJsonCodeReview.cs

using System;
using System.Collections.Generic;
using System.Linq;
using Newtonsoft.Json;

namespace JsonFormat
{
    public class Program
    {
        private const string InputData = @"{
          ""Directive"": ""S"",
          ""Wrapper"": [
            {
              ""Field1"": ""Apple"",
              ""Field2"": ""Peach"",
              ""Field3"": ""@!!!@008d613d1ca60885468bf274daa693cc778430fc8a539bdf2e7dc2dec88cd922"",
              ""Field4"": ""Kiwi""
            },
            {
              ""Field1"": ""Apple2"",
              ""Field2"": ""Peach2"",
              ""Field3"": ""@!!!@17e9ad37968e25893e96855ba3d633e250a401a6584b2bc9c7288f9fc458a9b6"",
              ""Field4"": ""Kiwi2""
            }
          ]
        }";

        private const string IntermediateResponse = @"{
          ""Wrapper"": [
            {
              ""Token"": ""@!!!@17e9ad37968e25893e96855ba3d633e250a401a6584b2bc9c7288f9fc458a9b6"",
              ""Value"": ""test""
            },
            {
              ""Token"": ""@!!!@008d613d1ca60885468bf274daa693cc778430fc8a539bdf2e7dc2dec88cd922"",
              ""Value"": ""test2""
            }
          ]
        }";

        public static void Main()
        {
            var inputData = JsonConvert.DeserializeObject<ItemsPayload>(InputData);

            var propertiesLookup = new Dictionary<string, ItemUpdate>();
            var propertiesRequest = new PropertySearchPayload {Wrapper = new List<PropertySearch>()};

            foreach (var item in inputData.Wrapper)
            foreach (var kvp in item.Where(property => property.Value.StartsWith("@!!!@")))
            {
                propertiesLookup[kvp.Value] = new ItemUpdate
                {
                    Properties = item,
                    UpdateKey = kvp.Key
                };
                propertiesRequest.Wrapper.Add(new PropertySearch
                {
                    Token = kvp.Value
                });
            }

            var intermediateRequest = JsonConvert.SerializeObject(propertiesRequest, Formatting.Indented);
            Console.WriteLine($"Built intermediate request payload:{Environment.NewLine}{intermediateRequest}");

            var intermediateData = JsonConvert.DeserializeObject<PropertySearchPayload>(IntermediateResponse);

            foreach (var item in intermediateData.Wrapper)
            {
                var itemToUpdate = propertiesLookup[item.Token];
                itemToUpdate.Properties[$"@{itemToUpdate.UpdateKey}"] = item.Value;
            }

            var result = JsonConvert.SerializeObject(inputData, Formatting.Indented);
            Console.WriteLine($"Built result:{Environment.NewLine}{result}");
        }

        public class ItemsPayload
        {
            public string Directive { get; set; }

            public List<Dictionary<string, string>> Wrapper { get; set; }
        }

        public class PropertySearchPayload
        {
            public List<PropertySearch> Wrapper { get; set; }
        }

        public class PropertySearch
        {
            public string Token { get; set; }

            public string Value { get; set; }
        }

        public class ItemUpdate
        {
            public Dictionary<string, string> Properties { get; set; }

            public string UpdateKey { get; set; }
        }
    }
}