using System;

using System.Linq;

​

using Newtonsoft.Json.Linq;

using System.Diagnostics;

​

public class Program

{

    public static void Main()

    {

        RunTestOnJson(TestObjectA, "Warmup", 10);

        for(int i = 0; i < 3; i++){

            RunTestOnJson(TestObjectA, "Where it's already a GUID", 100);

            RunTestOnJson(TestObjectB, "Where it's a string", 100);

        }

    }

​

    public static void RunTestOnJson(Func<JObject> jsonFac, string description, int count)

    {

        var seqA = Enumerable.Repeat(0, count).Select(n => jsonFac()).ToArray();

        Stopwatch timer = Stopwatch.StartNew();

        seqA.Select(ToGuidDumb).ToList();

        Console.WriteLine(description + " - dumb (ms): " + timer.ElapsedTicks);

        var seqB = Enumerable.Repeat(0, count).Select(n => jsonFac()).ToArray();

        timer = Stopwatch.StartNew();

        seqA.Select(ToGuidClever).ToList();

        Console.WriteLine(description + " - clever (ms): " + timer.ElapsedTicks);

    }

​

    public static Guid ToGuidDumb(dynamic json)

    {

        return Guid.Parse((string)json.Id);

    }

​

    public static Guid ToGuidClever(dynamic json)

    {

        return (Guid)json.Id;

    }

​

    public static JObject TestObjectA()

    {

        JObject json = new JObject();

        json["Id"] = Guid.NewGuid();

        return json;

    }

​

    public static JObject TestObjectB()

    {

        JObject json = new JObject();

        json["Id"] = Guid.NewGuid().ToString();

        return json;

    }

}