using System;

using AgileObjects.ReadableExpressions;

using AutoMapper;

using AutoMapper.Configuration.Annotations;

using System.Collections.Generic;

using System.Linq;

​

public static class ArrExtensions

{

    public static string Readable(this IEnumerable<int> intList)

    {

        if (intList == null)

            return "<A NULL LIST!>";

        string result = "[ ";

        string sep = "";

        foreach (var elem in intList)

        {

            result += sep + $"{elem}";

            sep = ",";

        }

        result += " ]";

        return result;

    }

}

​

public class Program

{   

    public static void Main()

    {

        int[] a = [ 2, 5, 6 ];

        int[] b = [ 2, 8 ];

        var diff = a.Except(b);

        Console.WriteLine($"Difference = {diff.Readable()}");

        // Demonstrates how to view an AutoMapper execution plan using the ReadableExpressions 

        // NuGet package. For a full write-up, visit:

        // https://agileobjects.co.uk/view-automapper-execution-plan-readableexpressions

        var configuration = new MapperConfiguration(cfg =>

        {

            cfg.CreateMap<Game, GameDto>()

            .ForMember(

                dest => dest.Genres,

                opt => opt.MapFrom(

                    src => src.GameGenres.Select(relation => relation.GenreId))

                );

        });

        // This retrieves the execution plan Expression which can best be viewed

        // in Visual Studio by installing the ReadableExpressions Debugger Visualizers from

        // https://marketplace.visualstudio.com/items?itemName=vs-publisher-1232914.ReadableExpressionsVisualizers,

        // mousing over the 'executionPlan' variable and clicking the magnifying glass:

        var executionPlan = configuration.BuildExecutionPlan(typeof(Game), typeof(GameDto));

​

        // This generates a string version of the execution plan which is printed

        // in the output when you run this fiddle:

        var description = executionPlan.ToReadableString();

        var mapper = configuration.CreateMapper();

        Game[] games = [

            new Game()

            {

                Id = 1,

                Title = "Hitman Absolution",

                Price = 60.0M,

                GameGenres = [

                    new ()

                    {

                        GameId = 1,

                        GenreId = 12

                    },

                    new ()

                    {

                        GameId = 1,

                        GenreId = 30

                    }

                ],

                ReleaseDate = new DateOnly(2012, 08, 12)

            },

            new Game()

            {

                Id = 2,

                Title = "Elden Ring",

                Price = 60.0M,

                GameGenres = [

                    new ()

                    {

                        GameId = 2,

                        GenreId = 15

                    },

                    new ()

                    {

                        GameId = 2,

                        GenreId = 9

                    },

                    new ()

                    {

                        GameId = 2,

                        GenreId = 22

                    }

                ],

                ReleaseDate = new DateOnly(2012, 08, 12)

            }

        ];

        var gameDtos = mapper.Map<Game[],IEnumerable<GameDto>>(games);

​

        Console.WriteLine(description);

        foreach (var gameDto in gameDtos)

        {

            Console.WriteLine($"[ Title = {gameDto.Title}, Id = {gameDto.Id}, Price = {gameDto.Price}, ReleaseDate = {gameDto.ReleaseDate}, Genres = {gameDto.Genres.Readable()} ]");

        }

        Console.ReadLine();

    }

    // Source classes.

    class Genre

    {

        public int Id;

        public string Name;

    }

    class GameGenre

    {

        public int GameId;

        public int GenreId;

    }

    class Game

    {

        public int Id;

        public string Title;

        public decimal Price;

        public DateOnly ReleaseDate;

        public IEnumerable<GameGenre> GameGenres;

        public string Unrelated;

    }

    // Destination class.

    class GameDto

    {

        public int Id;

        public string Title;

        public decimal Price;

        public IEnumerable<int> Genres;

        public DateOnly ReleaseDate;

    }

}