Improving LINQ Code Reusability: Select Method

namespace Demo
{
	using System;
	using System.Collections.Generic;
	using System.Linq;
	using System.Text;

	using Domain;
	using Mapper;
	using DataContracts;

	class Program
	{
		private static IEnumerable<Album> Albums
		{
			get
			{
				yield return new Album
				{
					AlbumId = 1,
					Price = 10.0m,
					Title = "The Dreamer",

					Artist = new Artist {
						ArtistId = 1,
						Name = "José James"
					},

					Genre = new Genre {
						GenreId = 1,
						Name = "Jazz"
					}
				};

				yield return new Album
				{
					AlbumId = 2,
					Price = 12.0m,
					Title = "Final Conversation of Kings",

					Artist = new Artist {
						ArtistId = 2,
						Name = "The Butterfly Effect"
					},

					Genre = new Genre {
						GenreId = 2,
						Name = "Progressive Rock"
					}
				};

				yield return new Album
				{
					AlbumId = 3,
					Price = 10.0m,
					Title = "Devotion",

					Artist = new Artist {
						ArtistId = 3,
						Name = "Jessie Ware"
					},

					Genre = new Genre {
						GenreId = 3,
						Name = "Pop Electronica"
					}
				};

				yield return new Album
				{
					AlbumId = 4,
					Price = 10.0m,
					Title = "Heritage",

					Artist = new Artist {
						ArtistId = 4,
						Name = "Opeth"
					},

					Genre = new Genre {
						GenreId = 4,
						Name = "Metal"
					}
				};


				yield return new Album
				{
					AlbumId = 5,
					Price = 12.0m,
					Title = "Fabriclive. 55 ",

					Artist = new Artist
					{
						ArtistId = 5,
						Name = "DJ Marky"
					},

					Genre = new Genre
					{
						GenreId = 5,
						Name = "Drum & Bass"
					}
				};
			}
		}

		static void Main(string[] args)
		{
			Console.WriteLine("Using LINQ - Convert to AlbumDetail");
			LinqConvertToAlbumDetail();
			Console.Read();


			Console.WriteLine("{0}{0}Using LINQ - Convert to AlbumSummary", System.Environment.NewLine);
			LinqConvertToAlbumSummary();
			Console.Read();


			Console.WriteLine("{0}{0}Using the mapper to create a single object - AlbumSummary", System.Environment.NewLine);
			CreateSingleObject();
			Console.Read();
		}


		private static void LinqConvertToAlbumDetail()
		{
			IObjectMapper mapper = new ObjectMapper();

			// using a delegate in Select method
			List<AlbumDetail> details = Albums.Select(mapper.Map<Album, AlbumDetail>).ToList();

			// OR
			// List<AlbumDetail> details = Albums.Select(x => mapper.Map<Album, AlbumDetail>(x));


			details.ForEach(detail => Console.WriteLine(detail));
		}


		private static void LinqConvertToAlbumSummary()
		{
			IObjectMapper mapper = new ObjectMapper();

			List <AlbumSummary> summaries = Albums.Select(mapper.Map<Album, AlbumSummary>).ToList();

			summaries.ForEach(summary => Console.WriteLine(summary));
		}


		private static void CreateSingleObject()
		{
			IObjectMapper mapper = new ObjectMapper();
			Album album = Albums.First();
			AlbumSummary summary = mapper.Map<Album, AlbumSummary>(album);

			Console.WriteLine(summary);
		}














		//private static AlbumDetail CreateAlbumDetail(Album album)
		//{
		//    return new AlbumDetail {
		//        AlbumId = album.AlbumId,
		//        Price = album.Price,
		//        Title = album.Title,

		//        ArtistId = album.ArtistId,
		//        GenreId = album.GenreId,
		//        ArtistName = (album.Artist == null) ? null : album.Artist.Name,
		//        GenreName = (album.Genre == null) ? null : album.Genre.Name
		//    };
		//}

		private static AlbumSummary CreateAlbumSummary(Album album)
		{
			return new AlbumSummary {
				AlbumId = album.AlbumId,
				Title = album.Title,

				ArtistName = (album.Artist == null) ? null : album.Artist.Name
			};
		}


		//private static void LinqConvertToAlbumDetail(int genreId)
		//{
		//    IObjectMapper mapper = new ObjectMapper();

		//    // using a delegate in Select method
		//    var albums = Albums.Select(CreateAlbumDetail);
		//    var albumsByGenre = Albums.Where(x => x.GenreId == genreId)
		//                            .Select(CreateAlbumDetail);

		//    // OR
		//    var albums2 = Albums.Select(x => CreateAlbumDetail(x));
		//    var albumsByGenre2 = Albums.Where(x => x.GenreId == genreId)
		//                            .Select(x => CreateAlbumDetail(x));
		//}
	}
}