///   <summary>

    ///   将指定字符串按指定长度进行剪切，

    ///   </summary>

    ///   <param   name= "Str "> 需要截断的字符串 </param>

    ///   <param   name= "maxLength "> 字符串的最大长度 </param>

    ///   <param   name= "endWith "> 超过长度的后缀 </param>

    ///   <returns> 如果超过长度，返回截断后的新字符串加上后缀，否则，返回原字符串 </returns>

    public static string StringTruncat(string Str, int maxLength, string endWith)

    {

        if (string.IsNullOrEmpty(Str))

        {

            return string.Empty;

        }

        if (maxLength < )

        {

            return Str;

        }

        if (Str.Length > maxLength)

        {

            string strTmp = Str.Substring(, maxLength);

            if (string.IsNullOrEmpty(endWith))

                return strTmp;

            else

                return strTmp + endWith;

        }

        return Str;

    }