Example of writing a JSON object and then updating a property via its JSONPath with a filter...

example.cs

using System;
using System.Text.Json;
using System.Threading.Tasks;
using NReJSON;
using StackExchange.Redis;

namespace RedisJsonTest
{
    class Program
    {
        static async Task Main(string[] args)
        {
            var muxr = await ConnectionMultiplexer.ConnectAsync("localhost");
            var db = muxr.GetDatabase(0);

            NReJSONSerializer.SerializerProxy = new JsonSerializerProxy();

            var result = await db.JsonSetAsync("example_json_key", 
                new ExampleWrapper(
                    new Example[]
                    {
                        new(1, "Test 1"),
                        new(2, "Test 2")
                    }), "$");

            Console.WriteLine($"Write is successful? {result.IsSuccess}");

            var initialResult = await db.JsonGetAsync("example_json_key", "$.List[?(@.Id == 2)].N");
            
            Console.WriteLine(initialResult.ToString());

            var updateResult = await db.JsonSetAsync("example_json_key", "\"Updated Value\"", "$.List[?(@.Id == 2)].N");
            
            Console.WriteLine($"Update is successful? {updateResult.IsSuccess}");

            var finalResult = await db.JsonGetAsync("example_json_key");
            
            Console.WriteLine($"Final result: {finalResult}");
        }
    }

    record Example(int Id, string N);

    record ExampleWrapper(Example[] List);

    class JsonSerializerProxy : ISerializerProxy
    {
        public TResult Deserialize<TResult>(RedisResult serializedValue) =>
            JsonSerializer.Deserialize<TResult>(serializedValue.ToString());

        public string Serialize<TObjectType>(TObjectType obj) =>
            JsonSerializer.Serialize(obj);
    }
}