using System;

    using System.Linq;

    using Newtonsoft.Json;

    using Newtonsoft.Json.Linq;

public class Program

{

            delegate string SortJObj(JToken obj);

​

    public static void Main()

    {

        string json = @"

        [

            {

                ""col1"": ""foo"",

                ""col2"": { ""name"": ""bar""}

            },

            {

                ""col1"": ""baz"",

                ""col2"": { ""name"": ""quux""}

            },

            {

                ""col1"": ""fizz"",

                ""col2"": { ""name"": ""bag""}

            }

        ]";

        JArray array = JArray.Parse(json);

        string testKey = "col1";

        string skey = "col2.name";

        string[] sortKeyNames = skey.Split('.');

        SortJObj sortJObj = delegate(JToken obj)

                {

                    var tempObj = obj.ToObject<JToken>();

                    foreach (var key in sortKeyNames)

                    {

                        if (tempObj[key] != null)

                        {

                            tempObj = tempObj[key];

                        }

                    }

​

                    return (string)tempObj;

                };

        JArray sorted = new JArray(array.OrderBy(

            obj => sortJObj

        ));

        Console.WriteLine(sorted.ToString(Formatting.Indented));

    }

}