C#中英文混合字符串截取函数

/// <summary>    /// 截断字符串    /// </summary>    /// <param name="maxLength">最大长度</param>    /// <param name="str">原字符串</param>    /// <returns></returns>    public static string CutStr(int maxLength, string str)    {      string temp = str;      if (Regex.Replace(temp, "[/u4e00-/u9fa5]", "zz", RegexOptions.IgnoreCase).Length <= maxLength)      {        return temp;      }      for (int i = temp.Length; i >= 0; i--)      {        temp = temp.Substring(0, i);        if (Regex.Replace(temp, "[/u4e00-/u9fa5]", "zz", RegexOptions.IgnoreCase).Length <= maxLength - 3)        {          return temp + "...";        }      }      return "...";    }

private string GetByteString(string center, int maxlen, string endStr)    {      string temp = center.Substring(0, (center.Length < maxlen + 1) ? center.Length : maxlen + 1);      byte[] encodedBytes = System.Text.ASCIIEncoding.ASCII.GetBytes(temp);      string outputStr = "";      int count = 0;      for (int i = 0; i < temp.Length; i++)      {        if ((int)encodedBytes[i] == 63)          count += 2;        else          count += 1;        if (count <= maxlen - endStr.Length)          outputStr += temp.Substring(i, 1);        else if (count > maxlen)          break;      }      if (count <= maxlen)      {        outputStr = temp;        endStr = "";      }      outputStr += endStr;      return outputStr;    }