Array.Reverse

Reverse String
Reverse String in C# 
using System;

public static class ReverseString
{
    public static string Reverse(string input)
    {
        var chars = input.ToCharArray();
        Array.Reverse(chars);
        return new string(chars);
    }
}

The string class' ToCharArray() method returns the string's characters as a char[].

Caution

The char[] returned by ToCharArray() is a copy of the string's characters. Modifying the values in the char[] does not update the string it was created from.

We then pass the char[] to the Array.Reverse() method, which will reverse the array's content in-place (meaning the argument is modified).

Finally, we return the reversed string by calling its constructor with the (reversed) char[].

Performance

If you're interested in how this approach's performance compares to other approaches, check the performance approach.

20th Nov 2024 · Found it useful?

Other Approaches to Reverse String in C#

Other ways our community solved this exercise
return new string(input.Reverse().ToArray());
LINQ

Use LINQ to concisely reverse a string. 

Span<char> chars = stackalloc char[input.Length];
for (var i = 0; i < input.Length; i++)
{
    chars[input.Length - 1 - i] = input[i];
}
return new string(chars);
Span<T>

Use Span<T> and stack allocation for hyper-optimized string reversal. 

var chars = new StringBuilder();
for (var i = input.Length - 1; i >= 0; i--)
{
    chars.Append(input[i]);
}
return chars.ToString();
StringBuilder

Reverse a string using the StringBuilder class.