C#: المجموعات والأنواع العامة

using System;
using System.Collections;

ArrayList list = new ArrayList();
list.Add(42);
list.Add("hello");

int value = (int)list[0];

foreach (object item in list)
{
    Console.WriteLine(item);
}

42
hello

using System;
using System.Collections.Generic;

List````<int>```` numbers = new List````<int>````();
numbers.Add(42);

foreach (int n in numbers)
{
    Console.WriteLine(n);
}

42

using System;
using System.Collections.Generic;

List````<string>```` fruits = new List````<string>```` { "apple", "banana", "cherry" };

fruits.Add("date");
fruits.AddRange(new string[] { "elderberry", "fig" });
fruits.Insert(1, "blueberry");

bool hasApple = fruits.Contains("apple");
int idx = fruits.IndexOf("cherry");

string found = fruits.Find(f => f.StartsWith("b"));
List````<string>```` allB = fruits.FindAll(f => f.StartsWith("b"));

fruits.Sort();
fruits.ForEach(f => Console.WriteLine(f));

Console.WriteLine("---");
Console.WriteLine($"Count: {fruits.Count}");
Console.WriteLine($"Has apple: {hasApple}");
Console.WriteLine($"Cherry index: {idx}");
Console.WriteLine($"First b-word: {found}");
Console.WriteLine($"All b-words: {string.Join(", ", allB)}");

apple
blueberry
banana
cherry
date
elderberry
fig
---
Count: 7
Has apple: True
Cherry index: 3
First b-word: blueberry
All b-words: blueberry, banana

using System;
using System.Collections.Generic;

List````<int>```` nums = new List````<int>```` { 10, 20, 30, 40, 50 };

nums.Remove(30);
nums.RemoveAt(0);

Console.WriteLine(string.Join(", ", nums));
Console.WriteLine($"Count: {nums.Count}");

20, 40, 50
Count: 3

using System;
using System.Collections.Generic;

Dictionary`<string, int>` scores = new Dictionary`<string, int>`
{
    { "Alice", 90 },
    { "Bob", 85 }
};

scores.Add("Charlie", 78);
scores["Bob"] = 92;

bool exists = scores.ContainsKey("Alice");

if (scores.TryGetValue("Dave", out int daveScore))
{
    Console.WriteLine($"Dave: {daveScore}");
}
else
{
    Console.WriteLine("Dave not found");
}

scores.Remove("Charlie");

Console.WriteLine($"Count: {scores.Count}");
Console.WriteLine("---Keys---");
foreach (string key in scores.Keys)
{
    Console.WriteLine(key);
}
Console.WriteLine("---Values---");
foreach (int val in scores.Values)
{
    Console.WriteLine(val);
}
Console.WriteLine("---Pairs---");
foreach (KeyValuePair`<string, int>` kv in scores)
{
    Console.WriteLine($"{kv.Key}: {kv.Value}");
}

Dave not found
Count: 2
---Keys---
Alice
Bob
---Values---
90
92
---Pairs---
Alice: 90
Bob: 92

using System;

T Max```<T>```(T a, T b) where T : IComparable```<T>```
{
    return a.CompareTo(b) >= 0 ? a : b;
}

Console.WriteLine(Max(3, 7));
Console.WriteLine(Max("apple", "banana"));

7
banana

using System;

class Box```<T>```
{
    private T _value;

    public Box(T value)
    {
        _value = value;
    }

    public T Value => _value;

    public override string ToString() => $"Box<{typeof(T).Name}>: {_value}";
}

Box````<int>```` intBox = new Box````<int>````(42);
Box````<string>```` strBox = new Box````<string>````("hello");

Console.WriteLine(intBox);
Console.WriteLine(strBox);

Box<Int32>: 42
Box<String>: hello

using System;

class Repository```<T>``` where T : class, new()
{
    public T Create()
    {
        T instance = new T();
        Console.WriteLine($"Created: {typeof(T).Name}");
        return instance;
    }
}

class Player
{
    public string Name { get; set; } = "Unknown";
}

Repository<Player> repo = new Repository<Player>();
Player p = repo.Create();
Console.WriteLine($"Name: {p.Name}");

Created: Player
Name: Unknown

using System;
using System.Collections.Generic;

Queue````<string>```` queue = new Queue````<string>````();
queue.Enqueue("first");
queue.Enqueue("second");
queue.Enqueue("third");

string front = queue.Peek();
Console.WriteLine($"Peek: {front}");

while (queue.Count > 0)
{
    Console.WriteLine($"Dequeue: {queue.Dequeue()}");
}

Peek: first
Dequeue: first
Dequeue: second
Dequeue: third

using System;
using System.Collections.Generic;

Stack````<int>```` stack = new Stack````<int>````();
stack.Push(10);
stack.Push(20);
stack.Push(30);

int top = stack.Peek();
Console.WriteLine($"Peek: {top}");

while (stack.Count > 0)
{
    Console.WriteLine($"Pop: {stack.Pop()}");
}

Peek: 30
Pop: 30
Pop: 20
Pop: 10

using System;
using System.Collections.Generic;

List````<int>```` nums = new List````<int>```` { 1, 2, 3, 4, 5 };
Dictionary`<string, double>` prices = new Dictionary`<string, double>`
{
    { "coffee", 3.5 },
    { "tea", 2.8 },
    { "juice", 4.0 }
};

Console.WriteLine(string.Join(", ", nums));
foreach (var kv in prices)
{
    Console.WriteLine($"{kv.Key}: ${kv.Value}");
}

1, 2, 3, 4, 5
coffee: $3.5
tea: $2.8
juice: $4

using System;
using System.Collections.Generic;

IEnumerable````<int>```` GetRange(int start, int end)
{
    for (int i = start; i <= end; i++)
    {
        yield return i;
    }
}

foreach (int n in GetRange(1, 5))
{
    Console.WriteLine(n);
}

1
2
3
4
5