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Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

How to: Modify String Contents (C# Programming Guide)

Strings are immutable, so it is not possible to modify the contents of string. The contents of a string can, however, be extracted into a non-immutable form, modified, and then formed into a new string instance.

Example

The following example uses the ToCharArray method to extract the contents of a string into an array of the char type. Some of the elements of this array are then modified. The char array is then used to create a new string instance.

class ModifyStrings
{
    static void Main()
    {
        string str = "The quick brown fox jumped over the fence";
        System.Console.WriteLine(str);

        char[] chars = str.ToCharArray();
        int animalIndex = str.IndexOf("fox");
        if (animalIndex != -1)
        {
            chars[animalIndex++] = 'c';
            chars[animalIndex++] = 'a';
            chars[animalIndex] = 't';
        }

        string str2 = new string(chars);
        System.Console.WriteLine(str2);
    }
}

Output

 
The quick brown fox jumped over the fence
The quick brown cat jumped over the fence

See Also

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