internal class Program
    {
        internal class Person
        {
            public Guid Id { get; set; }
            public string Name { get; set; }
        }

        private static void Main(string[] args)
        {
            // RegisterConventions
            var conventionPack = new ConventionPack
            {
                new IgnoreIfNullConvention(true),
                new NoIdMemberConvention()
            };
            ConventionRegistry.Register("GlobalConventions", conventionPack, t => true);

            // Mapping People collection
            var map = BsonClassMap.RegisterClassMap<Person>();
            map.AutoMap();
            map.MapProperty(c => c.Id).SetIsRequired(true);
            map.SetIdMember(map.GetMemberMap(c => c.Id));

            // Creating mongo client and dropping collection
            var mongoClient = new MongoClient("mongodb://buildbee");
            var mongoDatabase = mongoClient.GetDatabase("db");
            mongoDatabase.DropCollectionAsync("people").Wait();
            var peopleCollection = mongoDatabase.GetCollection<Person>("people");
            
            // one document is inserted
            peopleCollection.InsertOneAsync(new Person
            {
                Id = Guid.NewGuid(),
                Name = "A"
            }).Wait();

          
            DoIt("1- Count", () => peopleCollection.AsQueryable().Count());

            DoIt("2- ToList Without Select", () => peopleCollection.AsQueryable().ToList().Count);

            DoIt("3.1- ToList With Select", () => peopleCollection.AsQueryable().Select(p => p).ToList().Count);

            DoIt("3.2- ToList With Select", () => peopleCollection.AsQueryable().Select(p => new Person
            {
                Id = p.Id,
                Name = p.Name,
            }).ToList().Count);

            DoIt("3.3- ToList With Select", () => peopleCollection.AsQueryable().Select(p => new Person
            {
                Id = p.Id,
                // Name = p.Name,
            }).ToList().Count);

            DoIt("3.4- ToList With Select", () => peopleCollection.AsQueryable().Select(p => new Person
            {
                // Id = p.Id,
                Name = p.Name,
            }).ToList().Count);
        }

        private static void DoIt(string message, Func<int> countQuery)
        {
            try
            {
                Console.WriteLine(message);
                Console.WriteLine(countQuery());
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
            }
            Console.WriteLine();
        }
    }