H Парсинг Json на C# в черновиках Из песочницы

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web;

using Newtonsoft.Json;

namespace json
{
	class Program
	{
		private static void Main(string[] args)
		{
			const string json = @"{
   ""id"": ""cb6e111111aaaaaa"", 
   ""name"": ""Code Tester"", 
   ""first_name"": ""Code"", 
   ""last_name"": ""Tester"", 
   ""link"": ""http://profile.live.com/cid-cb6e111111aaaaaa/"", 
   ""gender"": ""male"", 
   ""emails"": {
      ""preferred"": ""tester@gmail.com"", 
      ""account"": ""tester@gmail.com"", 
      ""personal"": null, 
      ""business"": null
   }, 
   ""locale"": ""en_US"", 
   ""updated_time"": ""2012-05-21T21:40:43+0000""
}";
			var sw1 = new Stopwatch();
			var sw2 = new Stopwatch();
			var ser = JsonSerializer.CreateDefault();
			const int inner = 100000;
			const int outer = 10;
			for (var i = 0; i < outer; i++)
			{
				sw2.Start();
				for (var j = 0; j < inner; j++)
				{
					ParseJson(json);
				}
				sw2.Stop();
				sw1.Start();
				for (var j = 0; j < inner; j++)
				{
					using (var r = new StringReader(json))
					{
						ser.Deserialize<Dictionary<string, object>>(new JsonTextReader(r));
					}
				}
				sw1.Stop();
			}
			Console.WriteLine("json.net: {0} total, {1} per iteration", sw1.ElapsedMilliseconds, sw1.ElapsedMilliseconds/outer/inner );
			Console.WriteLine("handwritten: {0} total, {1} per iteration", sw2.ElapsedMilliseconds, sw2.ElapsedMilliseconds / outer / inner);
		}

		static Dictionary<string, string> ParseJson(string res)
		{
			var lines = res.Split("\r\n".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
			var ht = new Dictionary<string, string>(20);
			var st = new Stack<string>(20);

			for (int i = 0; i < lines.Length; ++i)
			{
				var line = lines[i];
				var pair = line.Split(":".ToCharArray(), 2, StringSplitOptions.RemoveEmptyEntries);

				if (pair.Length == 2)
				{
					var key = ClearString(pair[0]);
					var val = ClearString(pair[1]);

					if (val == "{")
					{
						st.Push(key);
					}
					else
					{
						if (st.Count > 0)
						{
							key = string.Join("_", st) + "_" + key;
						}

						if (ht.ContainsKey(key))
						{
							ht[key] += "&" + val;
						}
						else
						{
							ht.Add(key, val);
						}
					}
				}
				else if (line.IndexOf('}') != -1 && st.Count > 0)
				{
					st.Pop();
				}
			}

			return ht;
		}

		static string ClearString(string str)
		{
			str = str.Trim();

			var ind0 = str.IndexOf("\"");
			var ind1 = str.LastIndexOf("\"");

			if (ind0 != -1 && ind1 != -1)
			{
				str = str.Substring(ind0 + 1, ind1 - ind0 - 1);
			}
			else if (str[str.Length - 1] == ',')
			{
				str = str.Substring(0, str.Length - 1);
			}

			str = HttpUtility.UrlDecode(str);

			return str;
		}
	}
}