Common下StringHelper.cs 对html标签过滤

来源：互联网发布：linux shell 执行状态编辑：程序博客网时间：2024/05/18 19:37
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Text.RegularExpressions;using System.Web;namespace Common{    public class StringHelper    {        public static string SubStr(string sString, int nLeng)        {            if (sString.Length <= nLeng)            {                return sString;            }            else            {                return sString.Substring(0, nLeng) + "...";            }        }        /// <summary>        /// 清除脚本        /// </summary>        /// <param name="Htmlstring"></param>        /// <returns></returns>        public static string NoHTML(string Htmlstring)        {            //删除脚本             Htmlstring = Regex.Replace(Htmlstring, @"<script[^>]*?>.*?</script>", "", RegexOptions.IgnoreCase);            //删除HTML             Htmlstring = Regex.Replace(Htmlstring, @"<(.[^>]*)>", "", RegexOptions.IgnoreCase);            Htmlstring = Regex.Replace(Htmlstring, @"([/r/n])[/s]+", "", RegexOptions.IgnoreCase);            Htmlstring = Regex.Replace(Htmlstring, @"-->", "", RegexOptions.IgnoreCase);            Htmlstring = Regex.Replace(Htmlstring, @"<!--.*", "", RegexOptions.IgnoreCase);            Htmlstring = Regex.Replace(Htmlstring, @"&(quot|#34);", "/"", RegexOptions.IgnoreCase);            Htmlstring = Regex.Replace(Htmlstring, @"&(amp|#38);", "&", RegexOptions.IgnoreCase);            Htmlstring = Regex.Replace(Htmlstring, @"&(lt|#60);", "<", RegexOptions.IgnoreCase);            Htmlstring = Regex.Replace(Htmlstring, @"&(gt|#62);", ">", RegexOptions.IgnoreCase);            Htmlstring = Regex.Replace(Htmlstring, @"&(nbsp|#160);", " ", RegexOptions.IgnoreCase);            Htmlstring = Regex.Replace(Htmlstring, @"&(iexcl|#161);", "/xa1", RegexOptions.IgnoreCase);            Htmlstring = Regex.Replace(Htmlstring, @"&(cent|#162);", "/xa2", RegexOptions.IgnoreCase);            Htmlstring = Regex.Replace(Htmlstring, @"&(pound|#163);", "/xa3", RegexOptions.IgnoreCase);            Htmlstring = Regex.Replace(Htmlstring, @"&(copy|#169);", "/xa9", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, @"&#(/d+);", "", RegexOptions.IgnoreCase);            Htmlstring.Replace("<", "");            Htmlstring.Replace(">", "");            Htmlstring.Replace("/r/n", "");            Htmlstring = HttpContext.Current.Server.HtmlEncode(Htmlstring).Trim();            return Htmlstring;        }        /// <summary>        /// 生成指定长度的随机数字串        ///</summary>        ///<param name="length">长度</param>        ///<returns></returns>       public  static string RndStr(int length)        {            Random rnd = new Random();            string returnstring = "";            int i = 1;            while (i <= length)            {                returnstring += rnd.Next(0, 9).ToString();                i++;            }            return returnstring;        } /// <summary>        /// 截取字符串，保留其HTML格式        /// </summary>        /// <param name="strText"></param>        /// <param name="len"></param>        /// <returns></returns>        public static string CutWithSubstring(string strText, int len)        {            if (strText.Length > len)            {                return strText.Substring(0, len) + "…";            }            else            {                return strText;            }        }  public static string LoseHtml(string ContentStr)        {            string ClsTempLoseStr = "";            System.Text.RegularExpressions.Regex regEx = new System.Text.RegularExpressions.Regex("<///*[^<>]*>");            ClsTempLoseStr = regEx.Replace(ContentStr, "");            return ClsTempLoseStr;        }   /// <summary>        /// 截取字符串去掉其HTML字符        /// </summary>        /// <param name="inputString"></param>        /// <param name="len"></param>        /// <returns></returns>        public static string CutWithOutHtml(string inputString, int len)        {            int tempLen = 0;            string tempString = "";            inputString = LoseHtml(inputString);            ASCIIEncoding ascii = new ASCIIEncoding();            byte[] s = ascii.GetBytes(inputString);            for (int i = 0; i < s.Length; i++)            {                if ((int)s[i] == 63)                {                    tempLen += 2;                }                else                {                    tempLen += 1;                }                try                {                    tempString += inputString.Substring(i, 1);                }                catch                {                    break;                }                if (tempLen > len)                    break;            }            //如果截过则加上半个省略号            byte[] mybyte = System.Text.Encoding.Default.GetBytes(inputString);            if (mybyte.Length > len)            {                tempString = tempString.Substring(0, tempString.Length - 3 == 0 ? 1 : tempString.Length - 3) + "…";            }            return tempString;        }      }}
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