Linq101-Conversion Operators

using System;
using System.Linq;

namespace Linq101
{
    class Conversion
    {
        /// <summary>
        /// This sample uses ToArray to immediately evaluate a sequence into an array.
        /// </summary>
        public void Linq54()
        {
            double[] doubles = { 1.7, 2.3, 1.9, 4.1, 2.9 };

            //var doublesArray = doubles.OrderByDescending(d => d).ToArray();
            var sortedDoubles = from d in doubles
                                orderby d descending
                                select d;
            var doublesArray = sortedDoubles.ToArray();

            Console.WriteLine("Every other double from highest to lowest:");
            for (int d = 0; d < doublesArray.Length; d += 2)
            {
                Console.WriteLine(doublesArray[d]);
            }
        }

        /// <summary>
        /// This sample uses ToList to immediately evaluate a sequence into a List<T>.
        /// </summary>
        public void Linq55()
        {
            string[] words = { "cherry", "apple", "blueberry" };

            //var wordList = words.OrderBy(w => w).ToList();
            var sortedWords =
                from w in words
                orderby w
                select w;
            var wordList = sortedWords.ToList();

            Console.WriteLine("The sorted word list:");
            foreach (var w in wordList)
            {
                Console.WriteLine(w);
            }
        }

        /// <summary>
        /// This sample uses ToDictionary to immediately evaluate a sequence and a related key expression into a dictionary.
        /// </summary>
        public void Linq56()
        {
            var scoreRecords = new[] { new {Name = "Alice", Score = 50}, 
                                new {Name = "Bob"  , Score = 40}, 
                                new {Name = "Cathy", Score = 45} 
                            };

            var scoreRecordsDict = scoreRecords.ToDictionary(s => s.Name);

            Console.WriteLine("Bob' Score: {0}", scoreRecordsDict["Bob"].Score);
        }

        /// <summary>
        /// This sample uses OfType to return only the elements of the array that are of type double.
        /// </summary>
        public void Linq57()
        {
            object[] numbers = { null, 1.0, "two", 3, "four", 5, "six", 7.0 };

            var doubles = numbers.OfType<double>();

            Console.WriteLine("Numbers stored as doubles:");
            foreach (var d in doubles)
            {
                Console.WriteLine(d);
            }
        }
    }
}