39AcgEZK

1public class Foo1
2{
3
4    public static void Run()
5    {
6
7        var clients = GetClients();
8
9        Console.WriteLine($"Найдено {clients.Count} клиентов. Активных {clients.Where(e => e.IsActive).Count()}, неактивных {clients.Where(e => !e.IsActive).Count()}");
10
11        var appropriateClients = new List<Client>();
12
13        foreach (var client in clients)
14        {
15
16            if (!IsAppropriateEmail(client) || !client.IsActive)
17                continue;
18
19            appropriateClients.Add(client);
20        }
21        Console.WriteLine($"Найдено {appropriateClients.Count}");
22
23        Console.ReadLine();
24    }
25
26
27    private static bool IsAppropriateEmail(Client client)
28    {
29        return client.Email.EndsWith(".ru");
30    }
31
32    private static List<Client> GetClients()
33    {
34
35        //TODO: получать данных из БД
36
37        var result = new List<Client>();
38        List<string> domains = new List<string>
39        {
40            "yandex.ru",
41            "gmail.com",
42            "mail.ru",
43            "yandex.ua",
44            "yandex.kz"
45        };
46
47        for (int i = 1; i <= 10000000; i++)
48        {
49
50            var client = new Client
51            {
52
53                Name = "клиент " + i,
54
55                IsActive = i % 2 == 0 || i % 5 == 0
56
57            };
58
59
60            string domain = domains[0];
61
62            if (i % 11 == 0)
63                domain = domains[4];
64            else if (i % 9 == 0)
65                domain = domains[3];
66            else if (i % 5 == 0)
67                domain = domains[2];
68            else if (i % 3 == 0)
69                domain = domains[1];
70
71
72            client.Email = $"client{i}@{domain}";
73
74            result.Add(client);
75
76        }
77
78        return result;
79
80    }
81
82
83    public class Client
84    {
85
86        public string Name { get; set; }
87
88
89        public string Email { get; set; }
90
91
92        public bool IsActive { get; set; }
93
94    }
95
96}