using System;

    using System.Collections.Generic;

​

    using System.Globalization;

    using Newtonsoft.Json;

    using Newtonsoft.Json.Converters;

public class Program

{

    public static void Main()

    {

        string input = @"{

    ""warnings"": {

        ""123456789"": [{

                ""foo"": ""bar""

            },

            {

                ""foo"": ""bar""

            }

        ],

        ""987654321"": [{

                ""foo"": ""bar""

            },

            {

                ""foo"": ""bar""

            }

        ],

        ""893427443"": [{

                ""foo"": ""bar""

            },

            {

                ""foo"": ""bar""

            }

        ]

    }

}";

        var result = JsonConvert.DeserializeObject<WarningsJson>(input);

        result.Dump();

    }

    public partial class WarningsJson

    {

        [JsonProperty("warnings")]

        public Dictionary<int, List<Warning>> Warnings { get; set; }

    }

    public partial class Warning

    {

        [JsonProperty("foo")]

        public string Foo { get; set; }

    }

}