LINQ_FindCriminal

using System;
using System.Collections.Generic;
using System.Linq;

namespace Clight_38_LINQ_FindCriminal
{
    class Program
    {
        static void Main(string[] args)
        {

            int height = 0;
            int weight = 0;
            string nationality = "";

            Dictionary<string, Nationality> persons = new Dictionary<string, Nationality>
            {
                {"Иванов А.Г.", Nationality.Русский }, {"Владимиров Б.У.", Nationality.Русский}, {"Оксанин Г.В.", Nationality.Русский },
                {"Генацвали А.В.", Nationality.Грузин }, {"Маринин С.А.", Nationality.Русский}, {"Игорян Х.А.", Nationality.Грузин },
                {"Евгенов С.М.", Nationality.Русский }, {"Мариуполев С.В", Nationality.Таджик  }, {"Надеждина Н.Т.", Nationality.Русский },
                {"Русланков В.А." , Nationality.Русский}, {"Сергеев Н.Н.", Nationality.Русский }, {"Иринина И.П.", Nationality.Грузин },
                {"Маринок Ж.А.", Nationality.Таджик }, {"Игрил Х.Х.", Nationality.Таджик }, {"Оксанн П.С.", Nationality.Таджик },
                {"Возбудидзе А.Ю.", Nationality.Грузин }, {"Попин М.Ю.", Nationality.Русский }, {"Сааркян С.И.", Nationality.Грузин }
            };

            SecurityService securityService = new SecurityService(persons);

            while (true)
            {
                Console.Clear();
                Console.WriteLine("База Службы Безопасности.\n");

                height = securityService.CheckInputUser("\nВведите рост подозреваемого (см, от 155 до 210): ");
                weight = securityService.CheckInputUser("Введите вес подозреваемого (кг, от 60 до 110): ");
                nationality = securityService.CheckInputUserNationality("Введите национальность подозреваемого (Русский, Грузин, Таджик): ");

                List<Criminal> matchByCriminals = securityService.FindMatchByCriminals(height, weight, nationality);
                ShowCriminals(matchByCriminals);
            }
        }

        public static void ShowCriminals(List<Criminal> criminals)
        {
            if (criminals.Count == 0)
            {
                Console.WriteLine("\nПодозреваемых с такими данными не найдено.");
            }
            else
            {
                Console.WriteLine("\nНайдены подозреваемые:");

                foreach (var criminal in criminals)
                {
                    criminal.ShowInfo();
                }
            }

            Console.ReadKey();
        }
    }

    public enum Nationality
    {
        Русский, Грузин, Таджик
    }

    class SecurityService
    {
        private Random random = new Random();

        private List<Criminal> _criminals;

        public SecurityService(Dictionary<string, Nationality> persons)
        {
            _criminals = new List<Criminal>();

            foreach (var person in persons)
            {
                int height = random.Next(155, 210);
                int weight = random.Next(60, 110);
                bool isConclusion = Convert.ToBoolean(random.Next(0, 2));
                Criminal criminal = new Criminal(person.Key, person.Value.ToString(), height, weight, isConclusion);
                _criminals.Add(criminal);
            }
        }

        public List<Criminal> FindMatchByCriminals(int height, int weight, string nationality)
        {
            var filteredCrimanals = from Criminal criminal in _criminals
                                    where (criminal.Height > height - 3 && criminal.Height < height + 3) &&
                                    (criminal.Weight > weight - 3 && criminal.Weight < weight + 3) &&
                                    (criminal.Nationality == nationality) &&
                                    (criminal.IsConclusion == false)
                                    select criminal;

            return filteredCrimanals.ToList();
        }

        public int CheckInputUser(string text)
        {
            bool isNumber;
            bool isVerify = false;
            int verifyValue = 0;

            while (!isVerify)
            {
                Console.Write(text);
                isNumber = Int32.TryParse(Console.ReadLine(), out int value);

                if (isNumber)
                {
                    verifyValue = value;
                    isVerify = true;
                }
                else
                {
                    Console.WriteLine("Не корректный ввод.\n");
                    Console.ReadKey();
                }
            }

            return verifyValue;
        }

        public string CheckInputUserNationality(string text)
        {
            string nationality = "";
            bool isVerify = false;

            while (!isVerify)
            {
                Console.Write(text);
                nationality = Console.ReadLine();

                var filteredCrimanals = from Criminal criminal in _criminals
                                        where criminal.Nationality == nationality
                                        select criminal;

                if (filteredCrimanals.Count() > 0)
                {
                    isVerify = true;
                }
                else
                {
                    Console.WriteLine($"Национальность {nationality} в базе не найдена. Попробуйте ввести другую.\n");
                    Console.ReadKey();
                }
            }

            return nationality;
        }
    }
}

class Criminal
{
    Random random = new Random();

    public string Fio { get; private set; }
    public string Nationality { get; private set; }
    public int Height { get; private set; }
    public int Weight { get; private set; }
    public bool IsConclusion { get; private set; }

    public Criminal(string name, string nationality, int height, int weight, bool isConclusion)
    {
        Fio = name;
        Nationality = nationality;
        Height = height;
        Weight = weight;
        IsConclusion = isConclusion;
    }

    public void ShowInfo()
    {
        if (IsConclusion)
        {
            Console.WriteLine($"Ф.И.О.: {Fio}, Национальность: {Nationality}, Рост: {Height} см, Вес: {Weight} кг, Заключенный: да");
        }
        else
        {
            Console.WriteLine($"Ф.И.О.: {Fio}, Национальность: {Nationality}, Рост: {Height} см, Вес: {Weight} кг, Заключенный: нет");
        }
    }
}