Collections in C# | tutorialQ

Collections in C#
C# provides a rich set of collection classes to handle groups of related objects. These collections offer various ways to store, manage, and manipulate data efficiently.

Arrays:

Fixed size.
Fast access to elements by index.
Example:

code

using System;

namespace NationalParks
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] parks = { "Yellowstone", "Yosemite", "Zion", "Grand Canyon" };

            foreach (var park in parks)
            {
                Console.WriteLine(park);
            }
        }
    }
}

Lists:

Dynamically sized.
Provides methods to add, remove, and search elements.
Example:

code

using System;
using System.Collections.Generic;

namespace NationalParks
{
    class Program
    {
        static void Main(string[] args)
        {
            List<string> parks = new List<string> { "Yellowstone", "Yosemite", "Zion", "Grand Canyon" };

            parks.Add("Great Smoky Mountains");
            parks.Remove("Zion");

            foreach (var park in parks)
            {
                Console.WriteLine(park);
            }
        }
    }
}

Dictionaries:

Key-value pairs.
Fast lookup by key.
Example:

code

using System;
using System.Collections.Generic;

namespace NationalParks
{
    class Program
    {
        static void Main(string[] args)
        {
            Dictionary<string, int> parkEstablishments = new Dictionary<string, int>
            {
                { "Yellowstone", 1872 },
                { "Yosemite", 1890 },
                { "Grand Canyon", 1919 }
            };

            parkEstablishments["Great Smoky Mountains"] = 1934;

            foreach (var park in parkEstablishments)
            {
                Console.WriteLine($"{park.Key} was established in {park.Value}");
            }
        }
    }
}

HashSet:

Unordered collection of unique elements.
Fast lookup and insertion.
Example:

code

using System;
using System.Collections.Generic;

namespace NationalParks
{
    class Program
    {
        static void Main(string[] args)
        {
            HashSet<string> parks = new HashSet<string> { "Yellowstone", "Yosemite", "Zion", "Grand Canyon" };

            parks.Add("Great Smoky Mountains");
            parks.Remove("Zion");

            foreach (var park in parks)
            {
                Console.WriteLine(park);
            }
        }
    }
}