Newtonsoft.Json/Src/Newtonsoft.Json.Tests/Documentation/Samples/Linq/QueryJsonLinq.cs

using Newtonsoft.Json.Linq;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Newtonsoft.Json.Tests.Documentation.Samples.Linq
{
    public class QueryJsonLinq
    {
        public void Example()
        {
            #region Usage
            string json = @"{
              'channel': {
                'title': 'James Newton-King',
                'link': 'http://james.newtonking.com',
                'description': 'James Newton-King\'s blog.',
                'item': [
                  {
                    'title': 'Json.NET 1.3 + New license + Now on CodePlex',
                    'description': 'Annoucing the release of Json.NET 1.3, the MIT license and the source on CodePlex',
                    'link': 'http://james.newtonking.com/projects/json-net.aspx',
                    'category': [
                      'Json.NET',
                      'CodePlex'
                    ]
                  },
                  {
                    'title': 'LINQ to JSON beta',
                    'description': 'Annoucing LINQ to JSON',
                    'link': 'http://james.newtonking.com/projects/json-net.aspx',
                    'category': [
                      'Json.NET',
                      'LINQ'
                    ]
                  }
                ]
              }
            }";

            JObject rss = JObject.Parse(json);

            var postTitles =
                from p in rss["channel"]["item"]
                select (string)p["title"];

            foreach (var item in postTitles)
            {
                Console.WriteLine(item);
            }
            //LINQ to JSON beta
            //Json.NET 1.3 + New license + Now on CodePlex

            var categories =
                from c in rss["channel"]["item"].Children()["category"].Values<string>()
                group c by c
                into g
                orderby g.Count() descending
                select new { Category = g.Key, Count = g.Count() };

            foreach (var c in categories)
            {
                Console.WriteLine(c.Category + " - Count: " + c.Count);
            }
            //Json.NET - Count: 2
            //LINQ - Count: 1
            //CodePlex - Count: 1
            #endregion
        }
    }
}