Truncate string on whole words in .NET C#

Question

I am trying to truncate some long text in C#, but I don\'t want my string to be cut off part way through a word. Does anyone have a function that I can use to truncate my st

Answer 1

simplified, added trunking character option and made it an extension.

    public static string TruncateAtWord(this string value, int maxLength)
    {
        if (value == null || value.Trim().Length <= maxLength)
            return value;

        string ellipse = "...";
        char[] truncateChars = new char[] { ' ', ',' };
        int index = value.Trim().LastIndexOfAny(truncateChars);

        while ((index + ellipse.Length) > maxLength)
            index = value.Substring(0, index).Trim().LastIndexOfAny(truncateChars);

        if (index > 0)
            return value.Substring(0, index) + ellipse;

        return value.Substring(0, maxLength - ellipse.Length) + ellipse;
    }