public static MvcHtmlString StrLong(this HtmlHelper helper, string addInfo)
        {
            const string Shy = "­";
            if (addInfo != null)
            {
                string[] splitStr = addInfo.Split(' ');

                 for (int i = 0; i < splitStr.Length; i++)
                {
                    if (splitStr[i].Length > 30)
                    {
                        splitStr[i] = string.Join(Shy , System.Text.RegularExpressions.Regex.Split(splitStr[i], "(.{" + 30 + "})"));
                        if (splitStr[i].Substring(0, 5) == Shy)
                        {
                            splitStr[i] = splitStr[i].Substring(5, splitStr[i].Length - 5);
                        }
                    }
                }
                return new MvcHtmlString(string.Join(" ", splitStr));
            }
            else
            {
                return new MvcHtmlString("");
            }
        }