C# List

The List<T> class in C# is a generic class that is part of the System.Collections.Generic namespace. It provides a dynamic, resizable array that can hold elements of any data type T. The List<T> class is one of the most commonly used collection classes in C#.

Here is an example of how to create a List<int> and add some elements to it:

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        List<int> numbers = new List<int>();
        
        numbers.Add(1);
        numbers.Add(2);
        numbers.Add(3);
        
        Console.WriteLine(numbers[0]); // Output: 1
        Console.WriteLine(numbers[1]); // Output: 2
        Console.WriteLine(numbers[2]); // Output: 3
    }
}

In this example, we first create a new List<int> object called numbers. We then add three integers to the list using the Add method. Finally, we use the index operator ([]) to access and print the elements of the list.

The List<T> class provides many other useful methods for working with lists, such as Insert, Remove, Sort, Contains, and more. It also supports properties like Count, which returns the number of elements in the list, and Capacity, which returns the current capacity of the list.

One advantage of using a List<T> over an array is that you can easily add or remove elements from the list without having to manually resize the underlying data structure. The List<T> class will automatically resize the internal array as needed to accommodate the new elements.