using System.Collections.Generic;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        var json = @"{

            ""1"": ""str1"",

            ""2"": ""str1""

        }";

        var baseConfig = JObject.Parse(json);

        var conf = baseConfig.ToObject<IReadOnlyDictionary<int, string>>();

        foreach (var ket in conf) {

            System.Console.WriteLine(ket.Key + " " + ket.Value);

        }

    }

}