.NET截取指定长度的汉字超出部分用“···”代替

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/// <summary> /// 将指定的字符串按指定的长度剪切 /// </summary> /// <param name="oldStr">需要剪切的字符串</param> /// <param name="maxLength">需要字符串的最大的长度</param> /// <param name="endWith">超过长度的后缀</param> /// <returns>如果超过长度，返回截取的字符串加上后缀；否则返回原字符串</returns>     public static string StringTruncate(string oldStr, int maxLength, string endWith)     {         if (string.IsNullOrEmpty(oldStr))             return oldStr + endWith;         if (maxLength < 1)             throw new Exception("返回的字符串长度必须大于[0]");         if (oldStr.Length > maxLength)         {             string strTmp = oldStr.Substring(0, maxLength);             if (string.IsNullOrEmpty(endWith))                 return oldStr;             else                 return  strTmp + endWith;         }         return oldStr;     } }