Asp.net core How to extract data from third party json?

Question

ASP.NET

Good afternoon everyone.
I had to modify the old C# project a little, asp.net core. Unable to retrieve data from third party query request. Tried a lot of ways

using System;
using Newtonsoft.Json;
using System.Reflection;
using System.Web.Script.Serialization;
using System.IO;

var reader = new StreamReader(Request.InputStream);
string json = reader.ReadToEnd();

var dict = JsonConvert.DeserializeObject(json);

If I just send the received json to the log as a string, then I see the required json object, but I can’t parse it normally

using (StreamWriter sw = System.IO.File.CreateText(logPath))
        {
            sw.WriteLine(dict.GetType().GetProperties().ToString()); // System.Reflection.PropertyInfo[]
        }

How can I parse into an array or extract data one by one from an object?
Should there be simpler ways? no third party libraries