Guruh talabasi Komilova Shahloning Algoritmik tillar va dasturlash fanidan

where i%2==0 && i>10
select i;
foreach (int i in evens)
Console.WriteLine(i);
Bu erda qurilishdan foydalaniladi: from i in numbers
Kengaytma usuli yordamida bir xil so'rov:
int[] numbers = { 1, 2, 3, 4, 10, 34, 55, 66, 77, 88 };
IEnumerable<int> evens = numbers.Where(i => i % 2 == 0 && i > 10);
Muayyan element uchun Where usulidagi ifoda to'g'ri bo'lsa (bu holda ifoda i % 2 == 0 && i > 10), u holda bu element natijaviy tanlovga kiritiladi.
Murakkab ob'ektlarni tanlash
Aytaylik, bizda foydalanuvchi sinfi bor:
class User
{
public string Name { get;set; }
public int Age { get; set; }
public List Languages { get; set; }
public User()
{
Languages = new List();
}
}
Keling, foydalanuvchilar to'plamini yaratamiz va ulardan 25 yoshdan oshganlarni tanlaymiz:
List users = new List
{
new User {Name="Том", Age=23, Languages = new List {"английский", "немецкий" }},
new User {Name="Боб", Age=27, Languages = new List {"английский", "французский" }},
new User {Name="Джон", Age=29, Languages = new List {"английский", "испанский" }},
new User {Name="Элис", Age=24, Languages = new List {"испанский", "немецкий" }}
};
var selectedUsers = from user in users
where user.Age > 25
select user;
foreach (User user in selectedUsers)
Console.WriteLine($"{user.Name} - {user.Age}");
Konsol chiqishi:

Kengaytma usuli yordamida shunga o'xshash so'rov Where:
var selectedUsers = users.Where(u=> u.Age > 25);
Murakkab filtrlar
Endi murakkabroq filtrlarni ko'rib chiqamiz. Masalan, foydalanuvchi sinfida foydalanuvchi gapiradigan tillar ro'yxati mavjud. Agar foydalanuvchilarni til bo'yicha filtrlash kerak bo'lsa nima bo'ladi:
var selectedUsers = from user in users
from lang in user.Languages