using System;

using System.Linq;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        string json = @"

            {

              ""A"": {

                ""one"": {

                  ""a"": [ ""do"", ""re"", ""mi"" ],

                  ""b"": { ""fizz"": ""boom"", ""bang"": true },

                  ""c"": { ""foo"": 10, ""bar"": 20 }

                },

                ""two"": [

                  { ""foo"": 1, ""bar"": 2 },

                  { ""foo"": 3, ""bar"": 4 }

                ]

              },

              ""B"": {

                ""one"": {

                  ""a"": [

                    { ""sis"": ""dit"", ""boom"": ""dash"", ""bah"": ""dat"" },

                    { ""bing"": ""doo"", ""bang"": ""dah"", ""boom"": ""dee"" }

                  ],

                  ""b"": {

                    ""fee"": { ""foo"": ""bar"" },

                    ""fie"": { ""baz"": ""quux"" }

                  }

                },

                ""two"": { ""bang"": 50, ""pow"": 60 }

              }

            }";

​

        string[] keysToFind = new string[] { "foo", "bang" };

​

        JToken token = JToken.Parse(json);

        foreach (var key in keysToFind)

        {

            var paths = token.SelectTokens("$.." + key)

                             .Select(p => p.Path)

                             .ToList();

​

            Console.WriteLine("\"" + key + "\" was found at:\r\n  " + string.Join("\r\n  ", paths));

            Console.WriteLine();

        }

    }

}