.net中实现对文章内容分页实现程序

        /// 得到分页后的数据
        /// </summary>
        /// <param name="param">文章内容</param>
        /// <param name="size">文章字数（不包含HTML）</param>
        /// <returns></returns>
        public static List<string> SubstringTo(string param, int size)
        {
            param = NoHTML(param);//过滤一些有Wap上面不能显示的HTML标签，你也不可不过滤
            var length = param.ToCharArray().Length;
            var being = 0;
            var list = new List<string>();
            while (true)
            {
                string str = SubstringToHTML(param, being, size, "", out being);
                list.Add(str);
                if (length <= being)
                {
                    break;
                }
            }
            return list;
        }
 

 /// <summary>

        /// 按字节长度截取字符串(支持截取带HTML代码样式的字符串)
        /// </summary>
        /// <param name="param">将要截取的字符串参数</param>
        /// <param name="length">截取的字节长度</param>
        /// <param name="end">字符串末尾补上的字符串</param>
        /// <returns>返回截取后的字符串</returns>
        public static string SubstringToHTML(string param, int being, int length, string end, out int index)
        {
            string Pattern = null;
            MatchCollection m = null;
            StringBuilder result = new StringBuilder();
            int n = 0;
            char temp;
            bool isCode = false; //是不是HTML代码
            bool isHTML = false; //是不是HTML特殊字符,如&nbsp;
            char[] pchar = param.ToCharArray();
            int i = 0;
            for (i = being; i < pchar.Length; i++)
            {
                temp = pchar[i];
                if (temp == '<')
                {
                    isCode = true;
                }
                else if (temp == '&')
                {
                    isHTML = true;
                }
                else if (temp == '>' && isCode)
                {
                    //n = n - 1;
                    isCode = false;
                }
                else if (isHTML)
                {
                    isHTML = false;
                }
                if (!isCode && !isHTML)
                {
                    n = n + 1;
                    //UNICODE码字符占两个字节
                    if (System.Text.Encoding.Default.GetBytes(temp + "").Length > 1)
                    {
                        n = n + 1;
                    }
                }
                result.Append(temp);
                if (n >= length)
                {
                    break;
                }
            }
            index = i + 1;
            result.Append(end);
            //去掉成对的HTML标记,我的正则表达式不好，所以这里写得不好，大家可以写个正则直接去掉所有的
            temp_result = Regex.Replace(temp_result, @"(?is)<p[^>]*?>.*?</p>", "$2", RegexOptions.IgnoreCase);
            temp_result = Regex.Replace(temp_result, @"(?is)<a[^>]*?>.*?</a>", "$2", RegexOptions.IgnoreCase);
            temp_result = Regex.Replace(temp_result, @"(?is)<img[^>]*>", "$2", RegexOptions.IgnoreCase);
            temp_result = Regex.Replace(temp_result, @"(?is)<br[^>]*>", "$2", RegexOptions.IgnoreCase);
            //用正则表达式取出标记
            Pattern = ("</([a-zA-Z]+)*>");
            m = Regex.Matches(temp_result, Pattern);
            ArrayList bengHTML = new ArrayList();
            foreach (Match mt in m)
            {
                bengHTML.Add(mt.Result("$1"));
            }
            //补全前面不成对的HTML标记
            for (int nn = bengHTML.Count - 1; nn >= 0; nn--)
            {
                result.Insert(0, "<" + bengHTML[nn] + ">");
            }
            //用正则表达式取出标记
            Pattern = ("<([a-zA-Z]+)[^<>]*>");
            m = Regex.Matches(temp_result, Pattern);
            ArrayList endHTML = new ArrayList();
            foreach (Match mt in m)
            {
                endHTML.Add(mt.Result("$1"));
            }
            //补全后面不成对的HTML标记
            for (int nn = endHTML.Count - 1; nn >= 0; nn--)
            {
                result.Append("</");
                result.Append(endHTML[nn]);
                result.Append(">");
            }
            return result.ToString();
        }