asp.net截取指定长度的字符串内容

 /// <summary>
    /// 用于截取指定长度的字符串内容
    /// </summary>
    /// <param name="sString">用于截取的字符串</param>
    /// <param name="nLength">截取字符串的长度</param>
    /// <returns>返回截取后的字符串</returns>
    public string SubStr(string sString,int nLength)
    {
        if (sString.Length <= nLength)
        {
            return sString;
        }
        string sNewStr = sString.Substring(0, nLength);
        sNewStr = sNewStr + "...";
        return sNewStr;
    }