Convert a string array to an int array in C#

This post will discuss how to convert a string array to an integer array in C#.

1. Using `Array.ConvertAll()` method

C# provides the Array.ConvertAll() method for converting an array of one type to another type. We can use it as follows to convert a string array to an integer array:

using System;

public class Example

{

public static void Main()

{

string[] strings = new string[] {"1", "2", "3"};

int[] ints = Array.ConvertAll(strings, s => int.Parse(s));

Console.WriteLine(String.Join(",", ints));

}

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We can improve the above code by using a method group in place of a lambda expression.

using System;

public class Example

{

public static void Main()

{

string[] strings = new string[] {"1", "2", "3"};

int[] ints = Array.ConvertAll(strings, int.Parse);

Console.WriteLine(String.Join(",", ints));

}

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The int.Parse() method throws a FormatException if the string is not numeric. A better alternative is to call the Int32.TryParse() method. If the conversion operation fails, this method does not throw an exception and returns false. We can use this information to provide a default value when the conversion is failed for any member of the string array.

using System;

public class Example

{

public static void Main()

{

string[] strings = new string[] {"X", "2", "3"};

int[] ints = Array.ConvertAll(strings, s => int.TryParse(s, out var x) ? x : -1);

Console.WriteLine(String.Join(",", ints));

}

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3. Using LINQ

We can also pass the int.Parse() method to LINQ’s Select() method and then call ToArray to get an array.

using System;

using System.Linq;

public class Example

{

public static void Main()

{

string[] strings = new string[] {"1", "2", "3"};

int[] ints = strings.Select(int.Parse).ToArray();

Console.WriteLine(String.Join(",", ints));

}

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That’s all about converting a string array to an int array in C#.

Convert a string array to an int array in C#

1. Using Array.ConvertAll() method

3. Using LINQ

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1. Using `Array.ConvertAll()` method