How Can I Convert a String Array to an Integer Array Using LINQ in C#?

Convert string array to integer array in C# using LINQ

In programming, it is often necessary to convert an array of strings representing integers into an actual array of integers. This task can be easily accomplished using LINQ, a powerful language extension for working with collections.

LINQ solution using Select

One way to convert an array of strings to an array of integers is to use the Select extension method. This extension method allows you to convert each element of the collection into a new element using a specified lambda expression. In this case, the lambda expression can be int.Parse(s), where s is the string element:

<code class="language-csharp">int[] myInts = arr.Select(int.Parse).ToArray();</code>

This line of code applies the int.Parse method to each string element in the array, effectively converting it to an integer. The result is a collection of integers, which is then converted to an array using the ToArray method.

Alternatives using Array.ConvertAll

Another way to solve this problem is to use the Array.ConvertAll method. This method accepts an array and a lambda expression as arguments and returns a new array containing the result of applying the lambda expression to each element of the input array. In this case, the lambda expression can be int.Parse:

<code class="language-csharp">int[] myInts = Array.ConvertAll(arr, int.Parse);</code>

Short version using Array.ConvertAll

Finally, a cleaner version of the Array.ConvertAll solution can be achieved by omitting the lambda expression. This will result in shorter and simpler lines of code:

<code class="language-csharp">int[] myInts = Array.ConvertAll(arr, int.Parse);</code>

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