Extension Methods to Reverse a String and StringBuilder Object

jfriedman

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2 Jan 2011CPOL

This was already decided here in another thread...Using unsafe code and just copying the chars you get much better performance...You could also XORcharArray[i] ^= charArray[len];charArray[len] ^= charArray[i];charArray[i] ^= charArray[len];But something like this is...

This was already decided here in another thread...

Using unsafe code and just copying the chars you get much better performance...

You could also XOR

Copy Code

charArray[i] ^= charArray[len];
charArray[len] ^= charArray[i];
charArray[i] ^= charArray[len];

But something like this is actually faster due to less operations not allocations.

Copy Code

public static unsafe void Reverse(ref String string)
{
    fixed(char* chars = string)
    {
        int c = 0, d = string.Length - 1;
        while(c < d)
        {
            char t = chars[d];
            chars[d] = chars[c];
            chars[c] = t;
            c++;
            d--;
        }
    }
}

<pre lang="cs">public static void Reverse(ref String string)
{
        char[] chars = string.ToCharArray();
        int c = 0, d = string.Length - 1;
        while(c &lt; d)
        {
            char t = chars[d];
            chars[d] = chars[c];
            chars[c] = t;
            c++;
            d--;
        }    
string = new string(chars);
}

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

jfriedman

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	United States

Livin in a lonely world, caught the midnight train going anywhere... Only thing is it was a runaway train... and it ain't ever goin back...
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