TruncateAtWordStringExtension.cs

public static class StringExtentionMethods
{
	public static string TruncateAtWord(this string input, int maxlength, bool addEllipsis)
	{
		if (input == null || input.Length <= maxlength) return input;
		var ellipsisLengthDeduction = (addEllipsis ? 3 : 0);
		var iLastSpace = input.LastIndexOf(" ", (maxlength - ellipsisLengthDeduction), StringComparison.Ordinal);
		var iLength = 0;
		if (iLastSpace < 0)
		{
			// There are no spaces in this string, so we just truncate based on the overall length and take into account whether or not
			// we're going to be adding ellipsis to the result.
			iLength = maxlength - ellipsisLengthDeduction;
		}
		else
		{
			// There are spaces in the string, so we use the position of the last space as the place to cut the string.
			// Whether or not we're adding Ellipsis to the string is already accounted for when calculating the last space position.
			iLength = iLastSpace;
		}
		return string.Format("{0}{1}", input.Substring(0, iLength), (addEllipsis ? "..." : ""));
	}

	public static bool Contains(this string source, string value, StringComparison comparisonType)
	{
		return source.IndexOf(value, comparisonType) >= 0;
	}
}