Append a value to the end of a List in C#

This post will discuss how to append a value to the end of a list in C#.

1. Using `List<T>.Add()` Method

The recommended approach to insert an object at the end of a list is using the List<T>.Add() method. The following example demonstrates how to insert an integer in a List<int>.

using System;

using System.Collections.Generic;

public class Example

{

public static void Main()

{

List<int> nums = new List<int>() { 1, 2, 3, 4 };

int item = 5;

nums.Add(item);

Console.WriteLine(String.Join(", ", nums)); // 1, 2, 3, 4, 5

}

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2. Using `List<T>.Insert()` Method

The List<T>.Insert() method inserts the specified element into the List<T> at the specified index. It can be used as follows to insert an element at the end of a list.

using System;

using System.Collections.Generic;

public class Example

{

public static void Main()

{

List<int> nums = new List<int>() { 1, 2, 3, 4 };

int item = 5;

nums.Insert(nums.Count, item);

Console.WriteLine(String.Join(", ", nums)); // 1, 2, 3, 4, 5

}

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3. Using `Enumerable.Append()` Method

Starting with .NET Framework 4.7.1, you can use the Enumerable.Append() method to append a value to the end of a sequence. This method does not modify the items of the original sequence, but returns a new collection that ends with the specified element. The following code example demonstrates how to use Append() method to create a copy of a list with the new element.

using System;

using System.Collections.Generic;

public class Example

{

public static void Main()

{

List<int> nums = new List<int>() { 1, 2, 3, 4 };

int item = 5;

List<int> newNums = nums.Append(item).ToList();

Console.WriteLine(String.Join(", ", newNums)); // 1, 2, 3, 4, 5

}

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That’s all about appending a value to the end of a list in C#.

Append a value to the end of a List in C#

1. Using List<T>.Add() Method

2. Using List<T>.Insert() Method

3. Using Enumerable.Append() Method

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1. Using `List<T>.Add()` Method

2. Using `List<T>.Insert()` Method

3. Using `Enumerable.Append()` Method