using System;

using Newtonsoft.Json;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var json = @"{

                        ""A"": {

                            ""advanced-stats"": {

                                ""prop1"": 0.198791,

                                ""prop2"": 16.59,

                                ""prop3"": 12.44,

                            }

                        },

                        ""AA"": {

                            ""advanced-stats"": {

                                ""prop1"": 0.234,

                                ""prop2"": 16.59,

                                ""prop3"": 12.44,

                            }

                        },

                        ""AAAU"": {

                            ""advanced-stats"": {

                                ""prop1"": 0.3567,

                                ""prop2"": 16.59,

                                ""prop3"": 12.44,        

                            }

                        }

                    }";

​

        var result = JsonConvert.DeserializeObject<Dictionary<string, AdvancedRoot>>(json);

        foreach (var key in result.Keys)

        {

            Console.WriteLine(key + " (prop1): " + result[key].AdvancedStats.Prop1);

        }

    }

}

​

public class AdvancedStats

{

    public double Prop1 { get; set; }

    public double Prop2 { get; set; }

    public double Prop3 { get; set; }

}

​

public class AdvancedRoot

{

    [JsonProperty("advanced-stats")]

    public AdvancedStats AdvancedStats { get; set; }

}

​