using System;

using System.Collections.Generic;

using System.Text.Json;

public class Program

{

    public class A {

        public Guid userId {get;set;}

        public Guid businessId {get;set;}

        public Dictionary<int, long> rights {get;set;}

        private class B {

            public Guid userId {get;set;}

            public Guid businessId {get;set;}

            public string rights {get;set;}

        }

        private B b;

        public A(string json) {

            var o = new JsonSerializerOptions();

            o.AllowTrailingCommas = true;

            b = JsonSerializer.Deserialize<B>(json, o);

            userId = b.userId;

            businessId = b.businessId;

            rights = JsonSerializer.Deserialize<Dictionary<int, long>>(b.rights, o);

        }

    }

    public static void Main()

    {

        string strJson = @"{

    ""userId"": ""dc2af693-72e1-49a7-80aa-6416c6536bdf"",

    ""businessId"": ""0110eea4-7a47-4a7c-95ea-10547ab49652"",

    ""rights"": ""{\""19\"":1,\""17\"":15,\""18\"":1,\""23\"":1,\""1\"":31,\""20\"":3,\""3\"":1,\""16\"":0}"",

   }";

        var a = new A(strJson);

        Console.WriteLine("userID: " + a.userId.ToString());

        Console.WriteLine("businessId: " + a.businessId.ToString());

        Console.WriteLine("rights: ");

        foreach(var kvp in a.rights) {

            Console.WriteLine("Key: " + kvp.Key.ToString() + ", Value: " + kvp.Value.ToString());

        }

    }

}