Get slice of an array in C#

This post will discuss how to get a slice of an array in C#.

1. Using `ArraySegment<T>` Struct

The ArraySegment<T> structure delimits the specified range of the elements in the specified array. The following code example uses an ArraySegment<T> structure to return a portion of an integer array.

using System;

public class Example

{

public static void Main()

{

int[] arr = { 1, 2, 3, 4, 5 };

int start = 1, end = 3;

var segment = new ArraySegment<int>(arr, start, end);

Console.WriteLine(String.Join(", ", segment)); // 2, 3, 4

}

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2. Using LINQ

We can use the combination of LINQ’s Skip() and Take() methods to get a slice of an array. The Enumerable.Skip() method returns a copy of the sequence with a specified number of elements removed, and the Enumerable.Take() method returns the specified number of elements from the start of a sequence. Note that this approach is very slow as compared to the Array.Copy() method.

using System;

using System.Linq;

public class Example

{

public static void Main()

{

int[] arr = { 1, 2, 3, 4, 5 };

int start = 1, end = 3;

var slice = arr.Skip(start).Take(end - start + 1);

Console.WriteLine(String.Join(", ", slice)); // 2, 3, 4

}

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3. Using range notation

Starting from C# 8, we can use the range notation .. to get a slice of an array. It takes the start and the end of a range as its operands, where the start of the range is inclusive and the end of the range is exclusive. The following code example demonstrates this:

using System;

using System.Linq;

public class Example

{

public static void Main()

{

int[] arr = { 1, 2, 3, 4, 5 };

int start = 1, end = 3;

var slice = arr[start..(end + 1)];

Console.WriteLine(String.Join(", ", slice)); // 2, 3, 4

}

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That’s all about getting a slice of an array in C#.

Get slice of an array in C#

1. Using ArraySegment<T> Struct

2. Using LINQ

3. Using range notation

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1. Using `ArraySegment<T>` Struct