using System;

using System.Collections.Generic;

​

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        var content = @"

          {

            'name': 'property1',

            'changeset': 'CC123',

            'id': 'property1-CC123',

            'lastModifiedTime': '2018-05-03T09:55:00Z'

          }

        ";

        var property = JsonConvert.DeserializeObject<Property>(content);

        Console.WriteLine(property.Name);

        Console.WriteLine(property.Changeset);

        Console.WriteLine(property.Id);

        Console.WriteLine(property.Fields["lastModifiedTime"]);

        Console.ReadLine();

    }

    public class Property

    {

        public Property()

        {

            this.Fields = new Dictionary<string, JToken>();

        }

        public string Name { get; set; }

        public string Changeset { get; set; }

        public string Id { get; set; }

        [JsonExtensionData]

        public IDictionary<string, JToken> Fields { get; private set; }

    }

}