Qaysi obyektlar foreach siklida ishlatilishi mumkin?

Foreach tsiklida System.Collections.IEnumerable yoki System.Collections.Generic.IEnumerable<T> interfeysini amalga oshiradigan obyektlar ishlatilishi mumkin.

Asosiy obyekt turlari:

• Massivlar (bir- va ko‘p o‘lchovli)
• IEnumerable yoki IEnumerable<T> ni amalga oshiradigan kolleksiyalar:
  • List<T>
  • Dictionary<TKey, TValue>
  • HashSet<T>
  • Queue<T> va Stack<T>
  • System.Collections va System.Collections.Generic nomlar to‘plamlaridagi boshqa sinflar
• Stringlar (System.String - belgilar bo‘yicha iteratsiya qilinadi)
• LINQ so‘rovlaridan qaytarilgan obyektlar
• Yuqoridagi interfeyslarni amalga oshiradigan o‘ziga xos ma'lumot turlari.

Misol:

// Massiv
string[] colors = {"qizil", "yashil", "ko‘k"};
foreach (string color in colors)
{
    // ...
}

// List<T>
List<int> numbers = new List<int> {1, 2, 3, 4, 5};
foreach (int number in numbers)
{
    // ...
}

// string
string text = "salom";
foreach (char c in text)
{
    // ...
}

// Dictionary<TKey, TValue> KeyValuePair<TKey, TValue> bo‘yicha iteratsiya qiladi
Dictionary<string, int> ages = new Dictionary<string, int>
{
    {"Alice", 30},
    {"Bob", 25}
};
foreach (KeyValuePair<string, int> entry in ages)
{
    // entry.Key, entry.Value
}

// O‘ziga xos sinf, IEnumerable<T> ni amalga oshiradi
public class MyCollection : IEnumerable<int>
{
    private int[] _data = {10, 20, 30};

    public IEnumerator<int> GetEnumerator()
    {
        foreach (var item in _data)
        {
            yield return item; // Iteratordan foydalanish
        }
    }

    System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
    {
        return GetEnumerator();
    }
}

// O‘ziga xos sinfdan foydalanish
MyCollection myCollection = new MyCollection();
foreach (int item in myCollection)
{
    // ...
}