Basic Introduction To List In C#

Introduction to List

 

In C#, C# List class provides methods and properties to create a list of objects (classes). You can add items to a list during the initialization or using List.Add() and List.AddRange() methods.

 

List is a generic class. You must import the following namespace before using the List class. 

using System.Collections.Generic;

We also have the Author class that we will use in the later code examples. 

public class Author
{
    // Auto-Initialized properties
    public string Name { get; set; }
    public string Book { get; set; }
    public double Price { get; set; }
    public string AuthorDetails()
    {
        return string.Format("{0} is an author of {1}. Price: ${2}",
            Name, Book, Price);
    }
}

The following code example creates three lists of numbers, strings, and objects. 

// Create a List of int
List<int> numbers = new List<int>(5) { 5, 10, 15, 20, 25};

// Create a List of strings
List<string> names = new List<string>()
                    {"Mahesh Chand", "Neel Beniwal", "Chris Love" };

// Create a List of objects
List<Author> authors = new List<Author>
{
    new Author { Name = "Mahesh Chand", Book = "Apress", Price = 49.95 },
    new Author { Name = "Neel Beniwal", Book = "Apress", Price = 19.95 },
    new Author { Name = "Chris Love", Book = "PakT", Price = 29.95 }
};
// Read List objects

The following code example adds more items to the lists. 

// Add more items to List
numbers.Add(30);
numbers.Add(35);
numbers.Add(40);

// Add more items
names.AddRange(new string[] {"Raj Beniwal", "Allen O'neill" });

The following code example reads the list items. 

// Read List items
foreach (int num in numbers)
{
    Console.Write($"{num}, ");
}

// Read List items
foreach (string name in names)
{
    Console.Write($"{name}, ");
}

// Read List objects
foreach (Author author in authors)
{
    Console.WriteLine($"Author: {author.Name}:{author.Book}:{author.Price}");
}

Listing 1 Is the complete code example.

// Create a List of int
List<int> numbers = new List<int>(5) { 5, 10, 15, 20, 25};
// Add more items to List
numbers.Add(30);
numbers.Add(35);
numbers.Add(40);
// Read List items
foreach (int num in numbers)
{
    Console.Write($"{num}, ");
}

Console.WriteLine();

// Create a List of strings
List<string> names = new List<string>()
                    {"Mahesh Chand", "Neel Beniwal", "Chris Love" };
// Add more items
names.AddRange(new string[] {"Raj Beniwal", "Allen O'neill" });
// Read List items
foreach (string name in names)
{
    Console.Write($"{name}, ");
}

Console.WriteLine();

// Create a List of objects
List<Author> authors = new List<Author>
{
    new Author { Name = "Mahesh Chand", Book = "Apress", Price = 49.95 },
    new Author { Name = "Neel Beniwal", Book = "Apress", Price = 19.95 },
    new Author { Name = "Chris Love", Book = "PakT", Price = 29.95 }
};
// Read List objects
foreach (Author author in authors)
{
    Console.WriteLine($"Author: {author.Name}:{author.Book}:{author.Price}");
}

Listing 1.

 

Read this complete Tutorial on C# List to learn more about List in C#.