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(, nLength);
         sNewStr = sNewStr + "...";
         return sNewStr;
     }