.net过滤特定代码

#region/// 过滤html,js,css代码
        /// <summary>
        /// 过滤html,js,css代码
        /// </summary>
        /// <param name="html">参数传入</param>
        /// <returns></returns>
        public static string CheckStr(string html)
        {
            System.Text.RegularExpressions.Regex regex1 = new System.Text.RegularExpressions.Regex(@"<script[\s\S]+</script *>", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
            System.Text.RegularExpressions.Regex regex2 = new System.Text.RegularExpressions.Regex(@" href *= *[\s\S]*script *:", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
            System.Text.RegularExpressions.Regex regex3 = new System.Text.RegularExpressions.Regex(@" no[\s\S]*=", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
            System.Text.RegularExpressions.Regex regex4 = new System.Text.RegularExpressions.Regex(@"<iframe[\s\S]+</iframe *>", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
            System.Text.RegularExpressions.Regex regex5 = new System.Text.RegularExpressions.Regex(@"<frameset[\s\S]+</frameset *>", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
            System.Text.RegularExpressions.Regex regex6 = new System.Text.RegularExpressions.Regex(@"\<img[^\>]+\>", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
            System.Text.RegularExpressions.Regex regex7 = new System.Text.RegularExpressions.Regex(@"</p>", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
            System.Text.RegularExpressions.Regex regex8 = new System.Text.RegularExpressions.Regex(@"<p>", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
            System.Text.RegularExpressions.Regex regex9 = new System.Text.RegularExpressions.Regex(@"<[^>]*>", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
            html = regex1.Replace(html, ""); //过滤<script></script>标记
            html = regex2.Replace(html, ""); //过滤href=javascript: (<A>) 属性
            html = regex3.Replace(html, " _disibledevent="); //过滤其它控件的on...事件
            html = regex4.Replace(html, ""); //过滤iframe
            html = regex5.Replace(html, ""); //过滤frameset
            html = regex6.Replace(html, ""); //过滤frameset
            html = regex7.Replace(html, ""); //过滤frameset
            html = regex8.Replace(html, ""); //过滤frameset
            html = regex9.Replace(html, "");
            html = html.Replace(" ", "");
            html = html.Replace("</strong>", "");
            html = html.Replace("<strong>", "");
            return html;
        }
        #endregion
        #region  /// 过滤p /p代码
        /// <summary>
        /// 过滤p /p代码
        /// </summary>
        /// <param name="html">参数传入</param>
        /// <returns></returns>
        public static string InputStr(string html)
        {
            html = html.Replace(@"\<img[^\>]+\>", "");
            html = html.Replace(@"<p>", "");
            html = html.Replace(@"</p>", "");
            return html;
        }
        #endregion

  /// <summary>
        /// 截取字符串
        /// </summary>
        /// <param name="str"></param>
        /// <param name="length"></param>
        /// <returns></returns>
        protected string GetLength(string str, int length)
        {
            string strR = str;
            if (str.Length > length)
            {
                strR = str.Substring(0, length) + "...";
            }
            return strR;
        }