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🔧 Задача на C# для внимательных разработчиков

Что выведет следующий код?


using System;
using System.Collections.Generic;

class Program
{
static void Main()
{
var actions = new List<Action>();

for (int i = 0; i < 3; i++)
{
actions.Add(() => Console.WriteLine(i));
}

foreach (var action in actions)
action();
}
}


Варианты ответа:
A)

1
2


B)

3
3


C)

0
0


D)



---

Правильный ответ: B

Почему:
Лямбда-функции захватывают переменную
i по ссылке, а не её значение на каждой итерации. После завершения цикла i == 3, и все замыкания ссылаются на одно и то же i. Это классическая ловушка замыканий в C#.



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🔧 Задача на C# для внимательных разработчиков

Что выведет следующий код?


using System;
using System.Collections.Generic;

class Program
{
static void Main()
{
var actions = new List<Action>();

for (int i = 0; i < 3; i++)
{
actions.Add(() => Console.WriteLine(i));
}

foreach (var action in actions)
action();
}
}


Варианты ответа:
A)

1
2


B)

3
3


C)

0
0


D)



---

Правильный ответ: B

Почему:
Лямбда-функции захватывают переменную
i по ссылке, а не её значение на каждой итерации. После завершения цикла i == 3, и все замыкания ссылаются на одно и то же i. Это классическая ловушка замыканий в C#.

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