using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Runtime.Serialization.Formatters;

using System.IO;

using System.Data;

​

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

using Newtonsoft.Json.Converters;

using Newtonsoft.Json.Serialization;    

​

// https://stackoverflow.com/questions/45216683/how-to-get-sys-id-from-the-resultincident-response-from-below-c-sharp-code

​

    class TestClass

    {

        public static void Test()

        {

            var incident_responce = GetJson();

            TestSelectroots(incident_responce);

            TestDynamic(incident_responce);

            Console.WriteLine("\nInput JSON: ");

            Console.WriteLine(incident_responce);           

        }

        static void TestSelectroots(string incident_responce)

        {

            var root = JToken.Parse(incident_responce); 

            var value = (string)root.SelectToken("result.sys_id");          

            Console.WriteLine("{0} = \"{1}\"", "root.Selectroot(\"result.sys_id\")", value);

            Assert.IsTrue(value == "7fb4e50edb8c0b007ea0f4e9bf9619ba");         

        }

        static void TestDynamic(string incident_responce)

        {

            dynamic root = JToken.Parse(incident_responce); 

            var value = (string)root.result.sys_id;

            Console.WriteLine("{0} = \"{1}\"", "dynamic root.result.sys_id", value);

            Assert.IsTrue(value == "7fb4e50edb8c0b007ea0f4e9bf9619ba");         

        }

        static string GetJson()

        {

            var json = @"{

  ""result"": {

    ""number"": ""INC0012618"",

    ""opened_by"": {

      ""link"": ""//XXX.service-now.com/api/now/v1/table/sys_user/38723e5ddb42f200deb8f6fcbf96196d"",

      ""value"": ""38723e5ddb42f200deb8f6fcbf96196d""

    },

    ""sys_created_on"": ""2017-07-20 14:41:52"",

    ""sys_domain"": {

      ""link"": ""://XXX.service-now.com/api/now/v1/table/sys_user_group/global"",

      ""value"": ""global""

    },

    ""u_incident_summary"": """",

    ""business_service"": {

      ""link"": ""://xxx.service-now.com/api/now/v1/table/cmdb_ci_service/IT services"",

      ""value"": ""IT services""

    },

    ""work_end"": """",

    ""caller_id"": {

      ""link"": ""://xxxx.service-now.com/api/now/v1/table/sys_user/71f5455d4f735e000d7f0ed11310c719"",

      ""value"": ""71f5455d4f735e000d7f0ed11310c719""

    },

    ""close_code"": """",

    ""assignment_group"": {

      ""link"": ""://xxx.service-now.com/api/now/v1/table/sys_user_group/9e158987dba27a007ea0f4e9bf961983"",

      ""value"": ""9e158987dba27a007ea0f4e9bf961983""

    },

    ""sys_id"": ""7fb4e50edb8c0b007ea0f4e9bf9619ba"",

    ""u_outage_start_time"": """"

  }

}";

            return json;

        }

    }

​

    public class AssertionFailedException : System.Exception

    {

        public AssertionFailedException() : base() { }

​

        public AssertionFailedException(string s) : base(s) { }

    }

​

    public static class Assert

    {

        public static void IsTrue(bool value)

        {

            if (value == false)

                throw new AssertionFailedException("failed");

        }

    }

​

    public class Program

    {

        public static void Main()

        {

            Console.WriteLine("Environment version: " + Environment.Version);

            Console.WriteLine("Json.NET version: " + typeof(JsonSerializer).Assembly.FullName);

            Console.WriteLine();

​

            try

            {

                TestClass.Test();

            }

            catch (Exception ex)

            {

                Console.WriteLine(ex);

                throw;

            }

        }

    }

​